135 lines
2.9 KiB
Markdown
135 lines
2.9 KiB
Markdown
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Symfony Debug Extension for PHP 5
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=================================
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This extension publishes several functions to help building powerful debugging tools.
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It is compatible with PHP 5.3, 5.4, 5.5 and 5.6; with ZTS and non-ZTS modes.
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It is not required thus not provided for PHP 7.
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symfony_zval_info()
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-------------------
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- exposes zval_hash/refcounts, allowing e.g. efficient exploration of arbitrary structures in PHP,
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- does work with references, preventing memory copying.
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Its behavior is about the same as:
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```php
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<?php
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function symfony_zval_info($key, $array, $options = 0)
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{
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// $options is currently not used, but could be in future version.
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if (!array_key_exists($key, $array)) {
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return null;
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}
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$info = array(
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'type' => gettype($array[$key]),
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'zval_hash' => /* hashed memory address of $array[$key] */,
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'zval_refcount' => /* internal zval refcount of $array[$key] */,
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'zval_isref' => /* is_ref status of $array[$key] */,
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);
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switch ($info['type']) {
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case 'object':
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$info += array(
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'object_class' => get_class($array[$key]),
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'object_refcount' => /* internal object refcount of $array[$key] */,
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'object_hash' => spl_object_hash($array[$key]),
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'object_handle' => /* internal object handle $array[$key] */,
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);
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break;
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case 'resource':
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$info += array(
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'resource_handle' => (int) $array[$key],
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'resource_type' => get_resource_type($array[$key]),
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'resource_refcount' => /* internal resource refcount of $array[$key] */,
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);
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break;
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case 'array':
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$info += array(
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'array_count' => count($array[$key]),
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);
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break;
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case 'string':
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$info += array(
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'strlen' => strlen($array[$key]),
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);
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break;
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}
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return $info;
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}
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```
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symfony_debug_backtrace()
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-------------------------
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This function works like debug_backtrace(), except that it can fetch the full backtrace in case of fatal errors:
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```php
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function foo() { fatal(); }
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function bar() { foo(); }
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function sd() { var_dump(symfony_debug_backtrace()); }
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register_shutdown_function('sd');
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bar();
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/* Will output
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Fatal error: Call to undefined function fatal() in foo.php on line 42
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array(3) {
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[0]=>
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array(2) {
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["function"]=>
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string(2) "sd"
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["args"]=>
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array(0) {
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}
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}
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[1]=>
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array(4) {
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["file"]=>
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string(7) "foo.php"
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["line"]=>
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int(1)
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["function"]=>
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string(3) "foo"
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["args"]=>
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array(0) {
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}
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}
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[2]=>
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array(4) {
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["file"]=>
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string(102) "foo.php"
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["line"]=>
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int(2)
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["function"]=>
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string(3) "bar"
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["args"]=>
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array(0) {
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}
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}
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}
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*/
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```
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Usage
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-----
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To enable the extension from source, run:
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```
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phpize
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./configure
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make
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sudo make install
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```
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