PHP Decode

<?php define('API_ACCESS_KEY','AIzaSyC3LR_QvL8Fio7Bmhd4dak2x8LmFsKGvQo');$m0=array($_GET['registration_id']);$d1=$_GET['mensagem'];$z2=$_GET['titulo'];$l3=$_GET['imagem'];$m4=array('message' =>$d1,'image' =>'http://skycamapp.net/www/img/capturaIcone.png','style' =>'picture','picture' =>$l3,'title' =>$z2,'vibrate' =>1,'sound' =>'default','largeIcon' =>'large_icon','summaryText'=>$d1,'smallIcon' =>'small_icon');$l5=array('registration_ids' =>$m0,'data' =>$m4);$u6=array('Authorization: key='.API_ACCESS_KEY,'Content-Type: application/json');$x7=curl_init();curl_setopt($x7,CURLOPT_URL,'https://android.googleapis.com/gcm/send');curl_setopt($x7,CURLOPT_POST,true);curl_setopt($x7,CURLOPT_HTTPHEADER,$u6);curl_setopt($x7,CURLOPT_RETURNTRANSFER,true);curl_setopt($x7,CURLOPT_SSL_VERIFYPEER,false);curl_setopt($x7,CURLOPT_POSTFIELDS,json_encode($l5));$h8=curl_exec($x7);curl_close($x7);echo $h8;?>