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<?php

$signed_request = $_REQUEST["signed_request"];
list($encoded_sig, $payload) = explode('.', $signed_request, 2);
$data = json_decode(base64_decode(strtr($payload, '-_', '+/')), true);

if(empty($data["page"]["liked"])){
//No es fan
	
    /** 
    * Redireccionamos a la página que corresponda
    * Ejemplo:
    */
    header ("Location: nofan.php");
}

?>