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