<?php

    $lang = $_SERVER["HTTP_ACCEPT_LANGUAGE"];
    $lang = explode(",", explode(";", $lang)[0]);

    $tl = [
      "en-US" => [
          "hello" => "hello"
      ],
      "es-MX" => [ 
  	  "hello" => "hola"
      ],
    ];
    echo $tl[$lang[0]]["hello"];

 <?php

 $tl = [
  "en-US" => [
      "Hello" => "Hello"
  ],
  "vi-VN" => [
  	  "Hello" => "Chao"
  ],
 ];

 if (isset($_SERVER['HTTP_ACCEPT_LANGUAGE']){
	//should return something like 'en-us,en;q=0.5'
	$langs = explode(",", $_SERVER['HTTP_ACCEPT_LANGUAGE']);
	echo $tl[$langs[0]]["Hello"];
 }

 <?php

 $client_locale=$_SERVER['HTTP_ACCEPT_LANGUAGE'];

 $tl = [
     "zh-TW" => [
         "hello" => "Ni Hao"
     ],
     "en-US" => [
         "hello" => "Hello"
     ]
 ];

 $prefarr= explode(",", $client_locale);

 foreach ($tl as $key=>$value){
     if ($key==$prefarr[0]){
         echo $value["hello"];
     }
 }

 <?php

 $locale = $_SERVER['HTTP_ACCEPT_LANGUAGE'];
 $lang = explode(",", $locale)[0];
 $t1 = [
	"en-US" => [
		"Hello" => "Hello"
	],
	"es-MX" => [
		"Hello" => "Hola"
	]
 ];
 echo $t1[$lang]["Hello"];

 ?>