gistfile1.txt

<?php

function foo( $r ) {
	if ( 0 ) {
		$r = 1;
	}

	return $r;
}

$time = microtime();
for ( $n = 0; $n < 10000; $n++ ) {
	$foo = call_user_func_array( 'foo', array( 'foo' ) );
}
$time_diff = microtime() - $time;

var_dump( 'with' );
var_dump( 'Time diff: ' . $time_diff );

$time = microtime();
for ( $n = 0; $n < 10000; $n++ ) {
	$foo = 'foo';
}
$time_diff = microtime() - $time;

var_dump( 'without' );
var_dump( 'Time diff: ' . $time_diff );