PHP Decode

<?php 
 
$tsFile = base64_decode($_GET['token']); 
$privateKey = base64_decode('TWF2ZXJsaWNrMDkyNEAkJSE='); 
 
function decrypt($aesKey, $dataToDecrypt) { 
    $output = false; 
    $iv = NULL; 
    $dataToDecrypt = base64_decode($dataToDecrypt); 
    $output = openssl_decrypt($dataToDecrypt, 'AES-256-CBC', $aesKey, OPENSSL_RAW_DATA, $iv); 
    return $output; 
} 
 
function fetchContent($url) { 
 
    $ch = curl_init(); 
   
    curl_setopt($ch, CURLOPT_URL, $url); 
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); 
 
    $response = curl_exec($ch); 
     
    if(curl_errno($ch)) { 
 
        curl_close($ch); 
        return false; 
    } 
     
    curl_close($ch); 
     
    return $response; 
} 
 
header("Content-Type: video/mp2t"); 
 
$tsFileUrl = decrypt($privateKey,$tsFile); 
 
$tsContent = fetchContent($tsFileUrl); 
 
if ($tsContent !== false) { 
   
    echo $tsContent; 
   
} else { 
   
    http_response_code(500); 
   
    echo "Error: Unable to fetch content."; 
}  
 
?>