Multi-language system in PHP

multi-language.php

<?php

// config.php
$config['language'] = [];
$config['language']['default'] = 'en'; // no file for this language exists, will be just echoed as is
$config['language']['list'] = [
	'en' => '🇺🇸 English',
	'es' => '🇪🇸 Español',
];



// router.php
$app->load_language( @$app->user['language'], substr($_SERVER['HTTP_ACCEPT_LANGUAGE'], 0, 2) );


// es.php
$d = [];
$d["Dashboard"] = "Panel de Control";
$d["Hello %1!"] = "¡Hola %1!";
return $d;


// app.php
	function load_language( $lang1, $lang2 = null ){
		if ( array_key_exists($lang1, $this->config['language']['list']) ){
			$language = $lang1;
		}else if ( array_key_exists($lang2, $this->config['language']['list']) ){
			$language = $lang2;
		}else{
			$language = $this->config['language']['default'];
		}
		if ( file_exists(__DIR__.'/langs/'.$language.'.php') ){
			$this->dictionary = include __DIR__.'/langs/'.$language.'.php';
		}
	}


	function _( $string, $vars = [] ){
		if ( array_key_exists($string, $this->dictionary) ){
			$return = $this->dictionary[ $string ];
		}else{
			$return = $string;
		}
		$i = 1;
		foreach ($vars as $var) {
			$return = str_replace( '%' . $i, $vars[ $i-1 ], $return );
			$i++;
		}
		return $return;
	}


// example.php
$app->_('Hello %1!', ['Xavi']);