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Result for 100 items
APC time    : 0.00013709
Array time  : 0.00010800
APC - Array : 0.00002909 [% 26.93]
-------------------------
Result for 1000 items
APC time    : 0.00132179
Array time  : 0.00094199
APC - Array : 0.00037980 [% 40.32]
-------------------------
Result for 10000 items
APC time    : 0.01758194
Array time  : 0.01026487
APC - Array : 0.00731707 [% 71.28]
-------------------------
Result for 100000 items
APC time    : 0.38990903
Array time  : 0.11457086
APC - Array : 0.27533817 [% 240.32]
-------------------------

<?php

if(!extension_loaded('apc')){

	die("APC extension is not enabled.");
}

function generate_class_map($size){

	apc_clear_cache('user');

	$map = array();

	$class_prefix = '\Acme\Foo\Bar\Baz\Class';

	$file_prefix = '/path/to/classes/acme/foo/bar/baz';

	for($i = 0; $i < $size; $i++){

		$map[$class_prefix.'_'.$i] = $file_prefix.'_'.$i.'.php';

		apc_store($class_prefix.'_'.$i, $map[$class_prefix.'_'.$i]);
	}

	return $map;
}

function test_array(&$map, $class_name){

	if(isset($map[$class_name])){

		$file = $map[$class_name];

		// include the file
	}
}

function test_apc($class_name){

	$success = false;

	$file = apc_fetch($class_name, $success);

	if($success){

		// include the file
	}
}


$current = $start = 100;

$max = 100000;

if(php_sapi_name() != 'cli'){

	header('Content-Type: text/plain');
}

do{

	$map = generate_class_map($current);

	$start_time = microtime(true);

	for($i = 0; $i < $current; $i++){

		test_array($map, '\Acme\Foo\Bar\Baz\Class_'.$i);
	}

	$array_time = microtime(true) - $start_time;

	$start_time = microtime(true);

	for($i = 0; $i < $current; $i++){

		test_apc('\Acme\Foo\Bar\Baz\Class_'.$i);
	}

	$apc_time = microtime(true) - $start_time;


	echo sprintf("Result for %d items\n", $current);

	echo sprintf("%-12s: %01.8f\n", "APC time", $apc_time);

	echo sprintf("%-12s: %01.8f\n", "Array time", $array_time);

	echo sprintf("%-12s: %01.8f [%% %01.2f]\n", "APC - Array", ($apc_time - $array_time), (100* ($apc_time / $array_time)) - 100);

	echo "-------------------------\n";

	$current *= 10;

}while($current <= $max);