Overload apc_fetch and apc_add as a quick replacement for APC methods on systems that don't support it (like PHP 5.5 on OSX). These methods are not an exact reimplementation of the defined documentation on http://php.net. TTL is ignored, for one.

apc_overloads.php

<?php
// apc crashed on my dev box, so overload the methods if they don't exist

if (!function_exists('apc_fetch')) {
function apc_fetch($key, &$success) {
	if (!($filename = apc_get_tmpfile($key, $f))) {
		return false;
	}

	if (!($d = fread($f, filesize($filename)))) {
		$success = false;
		return false;
	}

	fclose($f);

	if (!($unserialized_d = unserialize($d))) {
		$success = false;
		return false;
	}

	return $unserialized_d;
}
}

if (!function_exists('apc_add')) {
function apc_add($key, $var, $ttl = 0) {
	if (!($filename = apc_get_tmpfile($key, $f))) {
		return false;
	}

	if (!($serialized_d = serialize($var))) {
		return false;
	}

	if (!ftruncate($f, filesize($filename))) {
		return false;
	}

	if (!fwrite($f, $serialized_d)) {
		return false;
	}

	fclose($f);

	return true;
}
}

function apc_get_tmpfile($name, &$f) {
	$tmpdir = sys_get_temp_dir();

	if (!($f = fopen($tmpdir . '/' . $name, 'c+'))) {
		return false;
	}

	return $tmpdir . '/' . $name;
}

Added support for apc_store and apc_delete here and a simple test script: https://gist.github.com/ReeseSys/a8eba3de5418a44418ff