677 lines
22 KiB
PHP
677 lines
22 KiB
PHP
<?php
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/**
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* @file
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* Provides Unicode-related conversions and operations.
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*/
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/**
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* Indicates an error during check for PHP unicode support.
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*/
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define('UNICODE_ERROR', -1);
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/**
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* Indicates that standard PHP (emulated) unicode support is being used.
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*/
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define('UNICODE_SINGLEBYTE', 0);
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/**
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* Indicates that full unicode support with the PHP mbstring extension is being
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* used.
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*/
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define('UNICODE_MULTIBYTE', 1);
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/**
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* Matches Unicode characters that are word boundaries.
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*
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* Characters with the following General_category (gc) property values are used
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* as word boundaries. While this does not fully conform to the Word Boundaries
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* algorithm described in http://unicode.org/reports/tr29, as PCRE does not
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* contain the Word_Break property table, this simpler algorithm has to do.
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* - Cc, Cf, Cn, Co, Cs: Other.
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* - Pc, Pd, Pe, Pf, Pi, Po, Ps: Punctuation.
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* - Sc, Sk, Sm, So: Symbols.
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* - Zl, Zp, Zs: Separators.
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*
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* Non-boundary characters include the following General_category (gc) property
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* values:
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* - Ll, Lm, Lo, Lt, Lu: Letters.
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* - Mc, Me, Mn: Combining Marks.
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* - Nd, Nl, No: Numbers.
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*
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* Note that the PCRE property matcher is not used because we wanted to be
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* compatible with Unicode 5.2.0 regardless of the PCRE version used (and any
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* bugs in PCRE property tables).
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*
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* @see http://unicode.org/glossary
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*/
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define('PREG_CLASS_UNICODE_WORD_BOUNDARY',
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'\x{0}-\x{2F}\x{3A}-\x{40}\x{5B}-\x{60}\x{7B}-\x{A9}\x{AB}-\x{B1}\x{B4}' .
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'\x{B6}-\x{B8}\x{BB}\x{BF}\x{D7}\x{F7}\x{2C2}-\x{2C5}\x{2D2}-\x{2DF}' .
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'\x{2E5}-\x{2EB}\x{2ED}\x{2EF}-\x{2FF}\x{375}\x{37E}-\x{385}\x{387}\x{3F6}' .
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'\x{482}\x{55A}-\x{55F}\x{589}-\x{58A}\x{5BE}\x{5C0}\x{5C3}\x{5C6}' .
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'\x{5F3}-\x{60F}\x{61B}-\x{61F}\x{66A}-\x{66D}\x{6D4}\x{6DD}\x{6E9}' .
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'\x{6FD}-\x{6FE}\x{700}-\x{70F}\x{7F6}-\x{7F9}\x{830}-\x{83E}' .
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'\x{964}-\x{965}\x{970}\x{9F2}-\x{9F3}\x{9FA}-\x{9FB}\x{AF1}\x{B70}' .
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'\x{BF3}-\x{BFA}\x{C7F}\x{CF1}-\x{CF2}\x{D79}\x{DF4}\x{E3F}\x{E4F}' .
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'\x{E5A}-\x{E5B}\x{F01}-\x{F17}\x{F1A}-\x{F1F}\x{F34}\x{F36}\x{F38}' .
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'\x{F3A}-\x{F3D}\x{F85}\x{FBE}-\x{FC5}\x{FC7}-\x{FD8}\x{104A}-\x{104F}' .
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'\x{109E}-\x{109F}\x{10FB}\x{1360}-\x{1368}\x{1390}-\x{1399}\x{1400}' .
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'\x{166D}-\x{166E}\x{1680}\x{169B}-\x{169C}\x{16EB}-\x{16ED}' .
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'\x{1735}-\x{1736}\x{17B4}-\x{17B5}\x{17D4}-\x{17D6}\x{17D8}-\x{17DB}' .
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'\x{1800}-\x{180A}\x{180E}\x{1940}-\x{1945}\x{19DE}-\x{19FF}' .
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'\x{1A1E}-\x{1A1F}\x{1AA0}-\x{1AA6}\x{1AA8}-\x{1AAD}\x{1B5A}-\x{1B6A}' .
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'\x{1B74}-\x{1B7C}\x{1C3B}-\x{1C3F}\x{1C7E}-\x{1C7F}\x{1CD3}\x{1FBD}' .
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'\x{1FBF}-\x{1FC1}\x{1FCD}-\x{1FCF}\x{1FDD}-\x{1FDF}\x{1FED}-\x{1FEF}' .
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'\x{1FFD}-\x{206F}\x{207A}-\x{207E}\x{208A}-\x{208E}\x{20A0}-\x{20B8}' .
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'\x{2100}-\x{2101}\x{2103}-\x{2106}\x{2108}-\x{2109}\x{2114}' .
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'\x{2116}-\x{2118}\x{211E}-\x{2123}\x{2125}\x{2127}\x{2129}\x{212E}' .
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'\x{213A}-\x{213B}\x{2140}-\x{2144}\x{214A}-\x{214D}\x{214F}' .
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'\x{2190}-\x{244A}\x{249C}-\x{24E9}\x{2500}-\x{2775}\x{2794}-\x{2B59}' .
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'\x{2CE5}-\x{2CEA}\x{2CF9}-\x{2CFC}\x{2CFE}-\x{2CFF}\x{2E00}-\x{2E2E}' .
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'\x{2E30}-\x{3004}\x{3008}-\x{3020}\x{3030}\x{3036}-\x{3037}' .
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'\x{303D}-\x{303F}\x{309B}-\x{309C}\x{30A0}\x{30FB}\x{3190}-\x{3191}' .
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'\x{3196}-\x{319F}\x{31C0}-\x{31E3}\x{3200}-\x{321E}\x{322A}-\x{3250}' .
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'\x{3260}-\x{327F}\x{328A}-\x{32B0}\x{32C0}-\x{33FF}\x{4DC0}-\x{4DFF}' .
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'\x{A490}-\x{A4C6}\x{A4FE}-\x{A4FF}\x{A60D}-\x{A60F}\x{A673}\x{A67E}' .
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'\x{A6F2}-\x{A716}\x{A720}-\x{A721}\x{A789}-\x{A78A}\x{A828}-\x{A82B}' .
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'\x{A836}-\x{A839}\x{A874}-\x{A877}\x{A8CE}-\x{A8CF}\x{A8F8}-\x{A8FA}' .
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'\x{A92E}-\x{A92F}\x{A95F}\x{A9C1}-\x{A9CD}\x{A9DE}-\x{A9DF}' .
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'\x{AA5C}-\x{AA5F}\x{AA77}-\x{AA79}\x{AADE}-\x{AADF}\x{ABEB}' .
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'\x{E000}-\x{F8FF}\x{FB29}\x{FD3E}-\x{FD3F}\x{FDFC}-\x{FDFD}' .
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'\x{FE10}-\x{FE19}\x{FE30}-\x{FE6B}\x{FEFF}-\x{FF0F}\x{FF1A}-\x{FF20}' .
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'\x{FF3B}-\x{FF40}\x{FF5B}-\x{FF65}\x{FFE0}-\x{FFFD}');
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/**
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* Wrapper around _unicode_check().
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*/
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function unicode_check() {
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list($GLOBALS['multibyte']) = _unicode_check();
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}
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/**
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* Perform checks about Unicode support in PHP, and set the right settings if
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* needed.
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*
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* Because Drupal needs to be able to handle text in various encodings, we do
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* not support mbstring function overloading. HTTP input/output conversion must
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* be disabled for similar reasons.
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*
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* @param $errors
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* Whether to report any fatal errors with form_set_error().
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*/
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function _unicode_check() {
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// Ensure translations don't break during installation.
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$t = get_t();
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// Check for mbstring extension
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if (!function_exists('mb_strlen')) {
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return array(UNICODE_SINGLEBYTE, $t('Operations on Unicode strings are emulated on a best-effort basis. Install the <a href="@url">PHP mbstring extension</a> for improved Unicode support.', array('@url' => 'http://www.php.net/mbstring')));
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}
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// Check mbstring configuration
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if (ini_get('mbstring.func_overload') != 0) {
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return array(UNICODE_ERROR, $t('Multibyte string function overloading in PHP is active and must be disabled. Check the php.ini <em>mbstring.func_overload</em> setting. Please refer to the <a href="@url">PHP mbstring documentation</a> for more information.', array('@url' => 'http://www.php.net/mbstring')));
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}
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if (ini_get('mbstring.encoding_translation') != 0) {
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return array(UNICODE_ERROR, $t('Multibyte string input conversion in PHP is active and must be disabled. Check the php.ini <em>mbstring.encoding_translation</em> setting. Please refer to the <a href="@url">PHP mbstring documentation</a> for more information.', array('@url' => 'http://www.php.net/mbstring')));
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}
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// mbstring.http_input and mbstring.http_output are deprecated and empty by
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// default in PHP 5.6.
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if (version_compare(PHP_VERSION, '5.6.0') == -1) {
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if (ini_get('mbstring.http_input') != 'pass') {
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return array(UNICODE_ERROR, $t('Multibyte string input conversion in PHP is active and must be disabled. Check the php.ini <em>mbstring.http_input</em> setting. Please refer to the <a href="@url">PHP mbstring documentation</a> for more information.', array('@url' => 'http://www.php.net/mbstring')));
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}
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if (ini_get('mbstring.http_output') != 'pass') {
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return array(UNICODE_ERROR, $t('Multibyte string output conversion in PHP is active and must be disabled. Check the php.ini <em>mbstring.http_output</em> setting. Please refer to the <a href="@url">PHP mbstring documentation</a> for more information.', array('@url' => 'http://www.php.net/mbstring')));
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}
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}
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// Set appropriate configuration
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mb_internal_encoding('utf-8');
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mb_language('uni');
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return array(UNICODE_MULTIBYTE, '');
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}
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/**
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* Returns Unicode library status and errors.
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*/
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function unicode_requirements() {
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// Ensure translations don't break during installation.
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$t = get_t();
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$libraries = array(
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UNICODE_SINGLEBYTE => $t('Standard PHP'),
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UNICODE_MULTIBYTE => $t('PHP Mbstring Extension'),
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UNICODE_ERROR => $t('Error'),
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);
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$severities = array(
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UNICODE_SINGLEBYTE => REQUIREMENT_WARNING,
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UNICODE_MULTIBYTE => REQUIREMENT_OK,
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UNICODE_ERROR => REQUIREMENT_ERROR,
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);
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list($library, $description) = _unicode_check();
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$requirements['unicode'] = array(
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'title' => $t('Unicode library'),
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'value' => $libraries[$library],
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);
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if ($description) {
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$requirements['unicode']['description'] = $description;
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}
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$requirements['unicode']['severity'] = $severities[$library];
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return $requirements;
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}
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/**
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* Prepares a new XML parser.
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*
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* This is a wrapper around xml_parser_create() which extracts the encoding
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* from the XML data first and sets the output encoding to UTF-8. This function
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* should be used instead of xml_parser_create(), because PHP 4's XML parser
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* doesn't check the input encoding itself. "Starting from PHP 5, the input
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* encoding is automatically detected, so that the encoding parameter specifies
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* only the output encoding."
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*
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* This is also where unsupported encodings will be converted. Callers should
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* take this into account: $data might have been changed after the call.
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*
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* @param $data
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* The XML data which will be parsed later.
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*
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* @return
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* An XML parser object or FALSE on error.
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*
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* @ingroup php_wrappers
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*/
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function drupal_xml_parser_create(&$data) {
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// Default XML encoding is UTF-8
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$encoding = 'utf-8';
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$bom = FALSE;
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// Check for UTF-8 byte order mark (PHP5's XML parser doesn't handle it).
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if (!strncmp($data, "\xEF\xBB\xBF", 3)) {
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$bom = TRUE;
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$data = substr($data, 3);
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}
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// Check for an encoding declaration in the XML prolog if no BOM was found.
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if (!$bom && preg_match('/^<\?xml[^>]+encoding="(.+?)"/', $data, $match)) {
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$encoding = $match[1];
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}
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// Unsupported encodings are converted here into UTF-8.
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$php_supported = array('utf-8', 'iso-8859-1', 'us-ascii');
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if (!in_array(strtolower($encoding), $php_supported)) {
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$out = drupal_convert_to_utf8($data, $encoding);
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if ($out !== FALSE) {
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$encoding = 'utf-8';
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$data = preg_replace('/^(<\?xml[^>]+encoding)="(.+?)"/', '\\1="utf-8"', $out);
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}
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else {
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watchdog('php', 'Could not convert XML encoding %s to UTF-8.', array('%s' => $encoding), WATCHDOG_WARNING);
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return FALSE;
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}
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}
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$xml_parser = xml_parser_create($encoding);
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xml_parser_set_option($xml_parser, XML_OPTION_TARGET_ENCODING, 'utf-8');
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return $xml_parser;
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}
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/**
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* Converts data to UTF-8.
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*
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* Requires the iconv, GNU recode or mbstring PHP extension.
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*
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* @param $data
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* The data to be converted.
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* @param $encoding
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* The encoding that the data is in.
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*
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* @return
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* Converted data or FALSE.
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*/
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function drupal_convert_to_utf8($data, $encoding) {
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if (function_exists('iconv')) {
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$out = @iconv($encoding, 'utf-8', $data);
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}
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elseif (function_exists('mb_convert_encoding')) {
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$out = @mb_convert_encoding($data, 'utf-8', $encoding);
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}
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elseif (function_exists('recode_string')) {
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$out = @recode_string($encoding . '..utf-8', $data);
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}
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else {
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watchdog('php', 'Unsupported encoding %s. Please install iconv, GNU recode or mbstring for PHP.', array('%s' => $encoding), WATCHDOG_ERROR);
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return FALSE;
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}
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return $out;
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}
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/**
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* Truncates a UTF-8-encoded string safely to a number of bytes.
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*
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* If the end position is in the middle of a UTF-8 sequence, it scans backwards
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* until the beginning of the byte sequence.
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*
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* Use this function whenever you want to chop off a string at an unsure
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* location. On the other hand, if you're sure that you're splitting on a
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* character boundary (e.g. after using strpos() or similar), you can safely
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* use substr() instead.
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*
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* @param $string
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* The string to truncate.
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* @param $len
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* An upper limit on the returned string length.
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*
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* @return
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* The truncated string.
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*/
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function drupal_truncate_bytes($string, $len) {
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if (strlen($string) <= $len) {
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return $string;
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}
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if ((ord($string[$len]) < 0x80) || (ord($string[$len]) >= 0xC0)) {
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return substr($string, 0, $len);
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}
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// Scan backwards to beginning of the byte sequence.
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while (--$len >= 0 && ord($string[$len]) >= 0x80 && ord($string[$len]) < 0xC0);
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return substr($string, 0, $len);
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}
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/**
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* Truncates a UTF-8-encoded string safely to a number of characters.
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*
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* @param $string
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* The string to truncate.
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* @param $max_length
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* An upper limit on the returned string length, including trailing ellipsis
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* if $add_ellipsis is TRUE.
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* @param $wordsafe
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* If TRUE, attempt to truncate on a word boundary. Word boundaries are
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* spaces, punctuation, and Unicode characters used as word boundaries in
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* non-Latin languages; see PREG_CLASS_UNICODE_WORD_BOUNDARY for more
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* information. If a word boundary cannot be found that would make the length
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* of the returned string fall within length guidelines (see parameters
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* $max_length and $min_wordsafe_length), word boundaries are ignored.
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* @param $add_ellipsis
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* If TRUE, add t('...') to the end of the truncated string (defaults to
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* FALSE). The string length will still fall within $max_length.
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* @param $min_wordsafe_length
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* If $wordsafe is TRUE, the minimum acceptable length for truncation (before
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* adding an ellipsis, if $add_ellipsis is TRUE). Has no effect if $wordsafe
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* is FALSE. This can be used to prevent having a very short resulting string
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* that will not be understandable. For instance, if you are truncating the
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* string "See myverylongurlexample.com for more information" to a word-safe
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* return length of 20, the only available word boundary within 20 characters
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* is after the word "See", which wouldn't leave a very informative string. If
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* you had set $min_wordsafe_length to 10, though, the function would realise
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* that "See" alone is too short, and would then just truncate ignoring word
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* boundaries, giving you "See myverylongurl..." (assuming you had set
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* $add_ellipses to TRUE).
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*
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* @return string
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* The truncated string.
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*/
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function truncate_utf8($string, $max_length, $wordsafe = FALSE, $add_ellipsis = FALSE, $min_wordsafe_length = 1) {
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$ellipsis = '';
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$max_length = max($max_length, 0);
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$min_wordsafe_length = max($min_wordsafe_length, 0);
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if (drupal_strlen($string) <= $max_length) {
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// No truncation needed, so don't add ellipsis, just return.
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return $string;
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}
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if ($add_ellipsis) {
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// Truncate ellipsis in case $max_length is small.
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$ellipsis = drupal_substr(t('...'), 0, $max_length);
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$max_length -= drupal_strlen($ellipsis);
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$max_length = max($max_length, 0);
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}
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if ($max_length <= $min_wordsafe_length) {
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// Do not attempt word-safe if lengths are bad.
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$wordsafe = FALSE;
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}
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if ($wordsafe) {
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$matches = array();
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// Find the last word boundary, if there is one within $min_wordsafe_length
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// to $max_length characters. preg_match() is always greedy, so it will
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// find the longest string possible.
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$found = preg_match('/^(.{' . $min_wordsafe_length . ',' . $max_length . '})[' . PREG_CLASS_UNICODE_WORD_BOUNDARY . ']/u', $string, $matches);
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if ($found) {
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$string = $matches[1];
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}
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else {
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$string = drupal_substr($string, 0, $max_length);
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}
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}
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else {
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$string = drupal_substr($string, 0, $max_length);
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}
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if ($add_ellipsis) {
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$string .= $ellipsis;
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}
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return $string;
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}
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/**
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* Encodes MIME/HTTP header values that contain incorrectly encoded characters.
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*
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* For example, mime_header_encode('tést.txt') returns "=?UTF-8?B?dMOpc3QudHh0?=".
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*
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* See http://www.rfc-editor.org/rfc/rfc2047.txt for more information.
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*
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* Notes:
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* - Only encode strings that contain non-ASCII characters.
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* - We progressively cut-off a chunk with truncate_utf8(). This is to ensure
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* each chunk starts and ends on a character boundary.
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* - Using \n as the chunk separator may cause problems on some systems and may
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* have to be changed to \r\n or \r.
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*
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* @param $string
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* The header to encode.
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*
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* @return string
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* The mime-encoded header.
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*
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* @see mime_header_decode()
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*/
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function mime_header_encode($string) {
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if (preg_match('/[^\x20-\x7E]/', $string)) {
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$chunk_size = 47; // floor((75 - strlen("=?UTF-8?B??=")) * 0.75);
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$len = strlen($string);
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$output = '';
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while ($len > 0) {
|
|
$chunk = drupal_truncate_bytes($string, $chunk_size);
|
|
$output .= ' =?UTF-8?B?' . base64_encode($chunk) . "?=\n";
|
|
$c = strlen($chunk);
|
|
$string = substr($string, $c);
|
|
$len -= $c;
|
|
}
|
|
return trim($output);
|
|
}
|
|
return $string;
|
|
}
|
|
|
|
/**
|
|
* Decodes MIME/HTTP encoded header values.
|
|
*
|
|
* @param $header
|
|
* The header to decode.
|
|
*
|
|
* @return string
|
|
* The mime-decoded header.
|
|
*
|
|
* @see mime_header_encode()
|
|
*/
|
|
function mime_header_decode($header) {
|
|
// First step: encoded chunks followed by other encoded chunks (need to collapse whitespace)
|
|
$header = preg_replace_callback('/=\?([^?]+)\?(Q|B)\?([^?]+|\?(?!=))\?=\s+(?==\?)/', '_mime_header_decode', $header);
|
|
// Second step: remaining chunks (do not collapse whitespace)
|
|
return preg_replace_callback('/=\?([^?]+)\?(Q|B)\?([^?]+|\?(?!=))\?=/', '_mime_header_decode', $header);
|
|
}
|
|
|
|
/**
|
|
* Decodes encoded header data passed from mime_header_decode().
|
|
*
|
|
* Callback for preg_replace_callback() within mime_header_decode().
|
|
*
|
|
* @param $matches
|
|
* The array of matches from preg_replace_callback().
|
|
*
|
|
* @return string
|
|
* The mime-decoded string.
|
|
*
|
|
* @see mime_header_decode()
|
|
*/
|
|
function _mime_header_decode($matches) {
|
|
// Regexp groups:
|
|
// 1: Character set name
|
|
// 2: Escaping method (Q or B)
|
|
// 3: Encoded data
|
|
$data = ($matches[2] == 'B') ? base64_decode($matches[3]) : str_replace('_', ' ', quoted_printable_decode($matches[3]));
|
|
if (strtolower($matches[1]) != 'utf-8') {
|
|
$data = drupal_convert_to_utf8($data, $matches[1]);
|
|
}
|
|
return $data;
|
|
}
|
|
|
|
/**
|
|
* Decodes all HTML entities (including numerical ones) to regular UTF-8 bytes.
|
|
*
|
|
* Double-escaped entities will only be decoded once ("&lt;" becomes "<"
|
|
* , not "<"). Be careful when using this function, as decode_entities can
|
|
* revert previous sanitization efforts (<script> will become <script>).
|
|
*
|
|
* @param $text
|
|
* The text to decode entities in.
|
|
*
|
|
* @return
|
|
* The input $text, with all HTML entities decoded once.
|
|
*/
|
|
function decode_entities($text) {
|
|
return html_entity_decode($text, ENT_QUOTES, 'UTF-8');
|
|
}
|
|
|
|
/**
|
|
* Counts the number of characters in a UTF-8 string.
|
|
*
|
|
* This is less than or equal to the byte count.
|
|
*
|
|
* @param $text
|
|
* The string to run the operation on.
|
|
*
|
|
* @return integer
|
|
* The length of the string.
|
|
*
|
|
* @ingroup php_wrappers
|
|
*/
|
|
function drupal_strlen($text) {
|
|
global $multibyte;
|
|
if ($multibyte == UNICODE_MULTIBYTE) {
|
|
return mb_strlen($text);
|
|
}
|
|
else {
|
|
// Do not count UTF-8 continuation bytes.
|
|
return strlen(preg_replace("/[\x80-\xBF]/", '', $text));
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Uppercase a UTF-8 string.
|
|
*
|
|
* @param $text
|
|
* The string to run the operation on.
|
|
*
|
|
* @return string
|
|
* The string in uppercase.
|
|
*
|
|
* @ingroup php_wrappers
|
|
*/
|
|
function drupal_strtoupper($text) {
|
|
global $multibyte;
|
|
if ($multibyte == UNICODE_MULTIBYTE) {
|
|
return mb_strtoupper($text);
|
|
}
|
|
else {
|
|
// Use C-locale for ASCII-only uppercase
|
|
$text = strtoupper($text);
|
|
// Case flip Latin-1 accented letters
|
|
$text = preg_replace_callback('/\xC3[\xA0-\xB6\xB8-\xBE]/', '_unicode_caseflip', $text);
|
|
return $text;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Lowercase a UTF-8 string.
|
|
*
|
|
* @param $text
|
|
* The string to run the operation on.
|
|
*
|
|
* @return string
|
|
* The string in lowercase.
|
|
*
|
|
* @ingroup php_wrappers
|
|
*/
|
|
function drupal_strtolower($text) {
|
|
global $multibyte;
|
|
if ($multibyte == UNICODE_MULTIBYTE) {
|
|
return mb_strtolower($text);
|
|
}
|
|
else {
|
|
// Use C-locale for ASCII-only lowercase
|
|
$text = strtolower($text);
|
|
// Case flip Latin-1 accented letters
|
|
$text = preg_replace_callback('/\xC3[\x80-\x96\x98-\x9E]/', '_unicode_caseflip', $text);
|
|
return $text;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Flips U+C0-U+DE to U+E0-U+FD and back.
|
|
*
|
|
* @param $matches
|
|
* An array of matches.
|
|
*
|
|
* @return array
|
|
* The Latin-1 version of the array of matches.
|
|
*
|
|
* @see drupal_strtolower()
|
|
*/
|
|
function _unicode_caseflip($matches) {
|
|
return $matches[0][0] . chr(ord($matches[0][1]) ^ 32);
|
|
}
|
|
|
|
/**
|
|
* Capitalizes the first letter of a UTF-8 string.
|
|
*
|
|
* @param $text
|
|
* The string to convert.
|
|
*
|
|
* @return
|
|
* The string with the first letter as uppercase.
|
|
*
|
|
* @ingroup php_wrappers
|
|
*/
|
|
function drupal_ucfirst($text) {
|
|
// Note: no mbstring equivalent!
|
|
return drupal_strtoupper(drupal_substr($text, 0, 1)) . drupal_substr($text, 1);
|
|
}
|
|
|
|
/**
|
|
* Cuts off a piece of a string based on character indices and counts.
|
|
*
|
|
* Follows the same behavior as PHP's own substr() function. Note that for
|
|
* cutting off a string at a known character/substring location, the usage of
|
|
* PHP's normal strpos/substr is safe and much faster.
|
|
*
|
|
* @param $text
|
|
* The input string.
|
|
* @param $start
|
|
* The position at which to start reading.
|
|
* @param $length
|
|
* The number of characters to read.
|
|
*
|
|
* @return
|
|
* The shortened string.
|
|
*
|
|
* @ingroup php_wrappers
|
|
*/
|
|
function drupal_substr($text, $start, $length = NULL) {
|
|
global $multibyte;
|
|
if ($multibyte == UNICODE_MULTIBYTE) {
|
|
return $length === NULL ? mb_substr($text, $start) : mb_substr($text, $start, $length);
|
|
}
|
|
else {
|
|
$strlen = strlen($text);
|
|
// Find the starting byte offset.
|
|
$bytes = 0;
|
|
if ($start > 0) {
|
|
// Count all the continuation bytes from the start until we have found
|
|
// $start characters or the end of the string.
|
|
$bytes = -1; $chars = -1;
|
|
while ($bytes < $strlen - 1 && $chars < $start) {
|
|
$bytes++;
|
|
$c = ord($text[$bytes]);
|
|
if ($c < 0x80 || $c >= 0xC0) {
|
|
$chars++;
|
|
}
|
|
}
|
|
}
|
|
elseif ($start < 0) {
|
|
// Count all the continuation bytes from the end until we have found
|
|
// abs($start) characters.
|
|
$start = abs($start);
|
|
$bytes = $strlen; $chars = 0;
|
|
while ($bytes > 0 && $chars < $start) {
|
|
$bytes--;
|
|
$c = ord($text[$bytes]);
|
|
if ($c < 0x80 || $c >= 0xC0) {
|
|
$chars++;
|
|
}
|
|
}
|
|
}
|
|
$istart = $bytes;
|
|
|
|
// Find the ending byte offset.
|
|
if ($length === NULL) {
|
|
$iend = $strlen;
|
|
}
|
|
elseif ($length > 0) {
|
|
// Count all the continuation bytes from the starting index until we have
|
|
// found $length characters or reached the end of the string, then
|
|
// backtrace one byte.
|
|
$iend = $istart - 1;
|
|
$chars = -1;
|
|
$last_real = FALSE;
|
|
while ($iend < $strlen - 1 && $chars < $length) {
|
|
$iend++;
|
|
$c = ord($text[$iend]);
|
|
$last_real = FALSE;
|
|
if ($c < 0x80 || $c >= 0xC0) {
|
|
$chars++;
|
|
$last_real = TRUE;
|
|
}
|
|
}
|
|
// Backtrace one byte if the last character we found was a real character
|
|
// and we don't need it.
|
|
if ($last_real && $chars >= $length) {
|
|
$iend--;
|
|
}
|
|
}
|
|
elseif ($length < 0) {
|
|
// Count all the continuation bytes from the end until we have found
|
|
// abs($start) characters, then backtrace one byte.
|
|
$length = abs($length);
|
|
$iend = $strlen; $chars = 0;
|
|
while ($iend > 0 && $chars < $length) {
|
|
$iend--;
|
|
$c = ord($text[$iend]);
|
|
if ($c < 0x80 || $c >= 0xC0) {
|
|
$chars++;
|
|
}
|
|
}
|
|
// Backtrace one byte if we are not at the beginning of the string.
|
|
if ($iend > 0) {
|
|
$iend--;
|
|
}
|
|
}
|
|
else {
|
|
// $length == 0, return an empty string.
|
|
return '';
|
|
}
|
|
|
|
return substr($text, $istart, max(0, $iend - $istart + 1));
|
|
}
|
|
}
|