note 106763 deleted from function.get-called-class by danbrown
| From: | danbrown@php.net | Date: | Tue, 06 Dec 2011 18:37:47 +0000 |
| Subject: | note 106763 deleted from function.get-called-class by danbrown | ||
| References: | 1 | Groups: | php.notes |
| Request: | Send a blank email to php-notes+get-184945@lists.php.net to get a copy of this message | ||
Note Submitter: xaguilars at gmail dot com
----
I've updated the get_called_class support function for PHP 5.2.
It was entering in a infinite loop when I was trying to call get_called_class() inside a function
called via call_user_func() or call_user_func_array().
It's tricky, but it works for me as expected. Tested in PHP 5.2.17
<?php
if (!function_exists('get_called_class')) {
function get_called_class($bt = false, $l = 1) {
if (!$bt)
$bt = debug_backtrace();
if (!isset($bt[$l]))
throw new Exception("Cannot find called class -> stack level too deep.");
if (!isset($bt[$l]['type'])) {
throw new Exception('type not set');
} else {
switch ($bt[$l]['type']) {
case '::': {
if (!isset($bt[$l]['file'])) {
if (isset($bt[$l + 1]) && isset($bt[$l +
1]["function"]) && isset($bt[$l + 1]["args"]) && isset($bt[$l +
1]["args"][0])) {
$btcall = $bt[$l + 1];
if (($btcall["function"] ==
"call_user_func")||($btcall["function"] == "call_user_func_array")) {
$func = $btcall["args"]["0"];
if (is_array($func))
return $func[0];
else {
$func = explode("::", $func);
return $func[0];
}
}
}
//if(isset($bt[$l]['class'])) return
$bt[$l]['class']; //this would return wrong class
//echo $l;print_r($bt);die();
throw new Exception("Could not find caller class: maybe you used a
variable to reference the class?.");
}
$lines = file($bt[$l]['file']);
$i = 0;
$callerLine = '';
do {
$i++;
$callerLine = $lines[$bt[$l]['line'] - $i] . $callerLine;
} while (stripos($callerLine, $bt[$l]['function']) === false);
preg_match('/([a-zA-Z0-9\_]+)::' . $bt[$l]['function'] .
'/', $callerLine, $matches);
if (!isset($matches[1])) {
// must be an edge case.
throw new Exception("Could not find caller class: originating
method call is obscured.");
}
switch ($matches[1]) {
case 'self':
case 'parent':
return get_called_class($bt, $l + 1);
default:
return $matches[1];
}
}
// won't get here.
case '->': {
switch ($bt[$l]['function']) {
case '__get':
// edge case -> get class of calling object
if (!is_object($bt[$l]['object']))
throw new Exception("Edge case fail. __get called on non
object.");
return get_class($bt[$l]['object']);
default: return $bt[$l]['class'];
}
}
default: throw new Exception("Unknown backtrace method type");
}
}
}
}
?>