genToken.php

<?php 

 function genToken(){


   	   $browser = get_browser();
   	   $token = "";

   	   foreach ($browser as $val)    	  		
   	   		$token .= utf8_encode($val);


   	   $token .= time();
   	   $token .= $userID; // sería el id del usuario que hace la petición
   	   $token .= $_SERVER["HTTP_REFERER"]; //es preferible mejorar esta línea ;)
   	   $token = hash("sha256", $token);

   	   $map = array(
   	   		"t" => "O",
   	   		"k" => "e",
   	   		"n" => "G",
   	   		"e" => "n"
   	   	);
    
     foreach ($map as $char => $val)
   	   $token = str_replace($char, $val, $token);

   	   $expiresIn =  3600 * 2;

   	   $dataToken = array(

   	   		"token" => $token,   	   		
   	   		"expiresDate" => time() + $expiresIn	   		

   	   	);




   	   return $dataToken;


   }