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README.md
001 Symfony Debug Extension for PHP 5
002 =================================
003
004 This extension publishes several functions to help building powerful debugging tools.
005 It is compatible with PHP 5.3, 5.4, 5.5 and 5.6; with ZTS and non-ZTS modes.
006 It is not required thus not provided for PHP 7.
007
008 symfony_zval_info()
009 -------------------
010
011 - exposes zval_hash/refcounts, allowing e.g. efficient exploration of arbitrary structures in PHP,
012 - does work with references, preventing memory copying.
013
014 Its behavior is about the same as:
015
016 ```php
017 <?php
018
019 function symfony_zval_info($key, $array, $options = 0)
020 {
021
022 // $options is currently not used, but could be in future version.
023
024 if (!array_key_exists($key, $array)) {
025 return null;
026 }
027
028 $info = array(
029 'type' => gettype($array[$key]),
030 'zval_hash' => /* hashed memory address of $array[$key] */,
031 'zval_refcount' => /* internal zval refcount of $array[$key] */,
032 'zval_isref' => /* is_ref status of $array[$key] */,
033 );
034
035 switch ($info['type']) {
036 case 'object':
037 $info += array(
038 'object_class' => get_class($array[$key]),
039 'object_refcount' => /* internal object refcount of $array[$key] */,
040 'object_hash' => spl_object_hash($array[$key]),
041 'object_handle' => /* internal object handle $array[$key] */,
042 );
043 break;
044
045 case 'resource':
046 $info += array(
047 'resource_handle' => (int) $array[$key],
048 'resource_type' => get_resource_type($array[$key]),
049 'resource_refcount' => /* internal resource refcount of $array[$key] */,
050 );
051 break;
052
053 case 'array':
054 $info += array(
055 'array_count' => count($array[$key]),
056 );
057 break;
058
059 case 'string':
060 $info += array(
061 'strlen' => strlen($array[$key]),
062 );
063 break;
064 }
065
066 return $info;
067 }
068 ```
069
070 symfony_debug_backtrace()
071 -------------------------
072
073 This function works like debug_backtrace(), except that it can fetch the full backtrace in case of fatal errors:
074
075 ```php
076 function foo() { fatal(); }
077 function bar() { foo(); }
078
079 function sd() { var_dump(symfony_debug_backtrace()); }
080
081 register_shutdown_function('sd');
082
083 bar();
084
085 /* Will output
086 Fatal error: Call to undefined function fatal() in foo.php on line 42
087 array(3) {
088 [0]=>
089 array(2) {
090 ["function"]=>
091 string(2) "sd"
092 ["args"]=>
093 array(0) {
094 }
095 }
096 [1]=>
097 array(4) {
098 ["file"]=>
099 string(7) "foo.php"
100 ["line"]=>
101 int(1)
102 ["function"]=>
103 string(3) "foo"
104 ["args"]=>
105 array(0) {
106 }
107 }
108 [2]=>
109 array(4) {
110 ["file"]=>
111 string(102) "foo.php"
112 ["line"]=>
113 int(2)
114 ["function"]=>
115 string(3) "bar"
116 ["args"]=>
117 array(0) {
118 }
119 }
120 }
121 */
122 ```
123
124 Usage
125 -----
126
127 To enable the extension from source, run:
128
129 ```
130 phpize
131 ./configure
132 make
133 sudo make install
134 ```
135