Which of these is a better php function?

Given below are two PHP functions which basically does the same thing, What i want to know is which one of these is the best to use?

$lang is an array which stores other values

$lang = array(

    'default' => 'This is the default text',

    'site' =&开发者_开发问答gt; array(
        'name' => 'Website',
        'url' => 'website.com',
    ),

    'logo' => 'images/logo',

);

and please note that i will be using one of these function throughout the application for displaying text as the application i am building support multiple languages.

Function 1:

function lang($text='default') {

    global $lang;

    $text = explode(',',$text);

    if(!empty($text[1])) {
        $newtext = $lang[$text[0]][$text[1]];
    }
    else {
        $newtext = $lang[$text[0]]; 
    }

    echo $newtext;

}

Usage : <?php lang('default'); ?> or <?php lang('site,name'); ?>

Function 2:

function lang($text='default', $text2='') {

    global $lang;

    if(!empty($text2)) {
        $newtext = $lang[$text][$text2];
    }
    else {
        $newtext = $lang[$text]; 
    }

    echo $newtext;

}

Usage : <?php lang('default'); ?> or <?php lang('site','name'); ?>

In my opinion, second function is more logical by the arguments. And explode function in first one is slower than operations with arrays in second.

The second, but I would rather split it into two methods.

Ex:

GetLanguage($site)
   returns an associative array of strings

And

GetLanguageKeyValue($site, $key)
    returns value as string

I prefer function 2: it is far more obvious that there are two parameters.