Use case
Even though PHP 5.3 is already out since more than one and a half year, a lot of web-hosters still don’t provide this version. In one of my projects I had to deal with the webhoster all-inkl. The project is written in PHP 5.3, but all-inkl supports PHP 5.2 only. Indeed they offer the possibility to use CGI version for PHP >5.2, but that doesn’t make me happy. So I tried to downgrade the project as successfull as possible.. But when it comes to 5.3′s Late Static Binding I faced problems to rebuild this functionality within 5.2. But after hours of searching the web and testing each approaches, I wrote my own hunky-dory function to fake LSB.
Solution
if( !function_exists( 'get_called_class' ) ) {
class class_tools {
static $i = 0;
static $fl = null;
static function get_called_class() {
$bt = debug_backtrace();
if( self::$fl == $bt[2]['file'].$bt[2]['line'] ) {
self::$i++;
} else {
self::$i = 0;
self::$fl = $bt[2]['file'].$bt[2]['line'];
}
$lines = file($bt[2]['file']);
preg_match_all(
'/([a-zA-Z0-9\_]+)::'.$bt[2]['function'].'/',
$lines[$bt[2]['line']-1],
$matches
);
return $matches[1][0];
}
}
function get_called_class() {
return class_tools::get_called_class();
}
}
Conclusion
This faked LSB gets only included if no native support for get_called_class exists (PHP <5.3). Otherwise the parser won’t recognize this code. Even though a lot of code examples don’t deal with the second index of the debug_backtrace-result ($bt[2]), for me it was/is the only way to make that LSB work correctly.
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Thanks ;)