Verifying Apple In-App Purchase validation receipt with PHP

Apple App Store Server API provides a kind of digital receipt (aka In-App Purchase validation receipt) for buyer, but it is actually encrypted, so you can't read it directly.

Below subscription_curl() enables you to have the decoded stream.

<?php

function subscription_curl ($request)
{
	ini_set('max_execution_time', 0);
	$decodeResponse = "";
	$appleurl = "https://buy.itunes.apple.com/verifyReceipt"; // for production
	$json['receipt-data'] = $request;
	$post = json_encode($json);
	$ch = curl_init();
	curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
	curl_setopt($ch, CURLOPT_URL, $appleurl);
	curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
	curl_setopt($ch, CURLOPT_POST, true);
	curl_setopt($ch, CURLOPT_POSTFIELDS, $post);
	$encodedResponse = curl_exec($ch);//Encoded apple response
	curl_close($ch);
	$decodeResponse = json_decode($encodedResponse, TRUE); //Decoded apple response
	$applestatus1 = isset($decodeResponse['status']) ? $decodeResponse['status']:NULL;
	if ($applestatus1 == 21007)
	{
			$appleurl = "https://sandbox.itunes.apple.com/verifyReceipt"; // for sandbox
			$ch = curl_init();
			curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
			curl_setopt($ch, CURLOPT_URL, $appleurl);
			curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
			curl_setopt($ch, CURLOPT_POST, true);
			curl_setopt($ch, CURLOPT_POSTFIELDS, $post);
			$encodedResponse = curl_exec($ch);//Encoded apple response
			curl_close($ch);
			$decodeResponse = json_decode($encodedResponse, TRUE); //Decoded apple response
	}
	// return array($encodedResponse, $decodeResponse);			
	return $decodeResponse;
}
$receipt = "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";

echo "<pre>";
print_r( subscription_curl( $receipt));
echo "</pre><br>";