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);

@soderlind How will this play with WPML cache? Think they use JSON. How do you verify it is working as it should and stored in Redis object cache, do you SCAN?