A faster load_textdomain for WordPress

a_faster_load_textdomain.php

<?php
/*
Plugin Name: A faster load_textdomain
Version: 0.0.1
Description: While we're wating for https://core.trac.wordpress.org/ticket/32052.
Author: Per Soderlind
Author URI: https://soderlind.no
Plugin URI: https://gist.github.com/soderlind/610a9b24dbf95a678c3e
License: GPL

Save the plugin in mu-plugins. You don't have to, but you should add an an object cache. See benchmarks at https://core.trac.wordpress.org/ticket/32052#comment:7

Credit: nicofuma , I just created the plugin based on his patch (https://core.trac.wordpress.org/ticket/32052)

*/

function a_faster_load_textdomain($retval, $domain, $mofile) {
	global $l10n;

	if ( !is_readable( $mofile ) ) return false;

	$data = get_transient(md5($mofile));
	$mtime = filemtime($mofile);

	$mo = new MO();
	if (!$data || !isset($data['mtime']) || $mtime > $data['mtime']) {
		if ( !$mo->import_from_file( $mofile ) ) return false;
		$data = array(
			'mtime' => $mtime,
			'entries' => $mo->entries,
			'headers' => $mo->headers
		);
		set_transient(md5($mofile), $data);
	} else {
		$mo->entries = $data['entries'];
		$mo->headers = $data['headers'];
	}

	if ( isset( $l10n[$domain] ) ) {
		$mo->merge_with( $l10n[$domain] );
	}

	$l10n[$domain] = &$mo;

	return true;
}
add_filter('override_load_textdomain','a_faster_load_textdomain',1,3);