static callback vs. create_function (for Lopo@nettechat)

gistfile1.php

<?php

class Foo
{
	public static function testA($value, $prefix = '')
	{
		self::$substitutePrefix = $prefix;
		return preg_replace_callback('#:([^:\s]*):#', array(__CLASS__, 'testCb'), $value);
	}

	private static $substitutePrefix; // workaround for f***ing PHP <5.3

	private static function testCb($m)
	{
		return '';
	}
	
	public static function testB($value, $prefix = '')
	{
		return preg_replace_callback('#:([^:\s]*):#', create_function('$m, $prefix='."'$prefix'", 'return "";'), $value);
	}
}

$xts = microtime(TRUE);
for ($i = 0; $i < 20000; $i++) {
	Foo::testA(':foo:bar', 'x');
}
$xts = microtime(TRUE) - $xts;

$yts = microtime(TRUE);
for ($i = 0; $i < 20000; $i++) {
	Foo::testB(':foo:bar', 'x');
}
$yts = microtime(TRUE) - $yts;

var_dump($xts, $yts);