DataSift CSDL compile from file

<?php
ini_set('memory_limit', '-1');
define('DATASIFT_USERNAME', '<DS_USERNAME>');
define('DATASIFT_APIKEY', '<DS_API_KEY>');
 
$csdl = file_get_contents('<MY_CSDL_FILE>');


compile(trim($csdl)); 


function compile($csdl) {

	$url = 'https://api.datasift.com/v1/compile?username=' . DATASIFT_USERNAME . '&api_key=' . DATASIFT_APIKEY ;
	
	$ch = curl_init();
	$post_body = urlencode ($csdl) ;
	curl_setopt($ch,CURLOPT_RETURNTRANSFER, true);
	curl_setopt($ch,CURLOPT_URL,            $url);
	curl_setopt($ch,CURLOPT_POST,           1);
	curl_setopt($ch,CURLOPT_POSTFIELDS,     'csdl='.$post_body);

	curl_setopt($ch,CURLOPT_HTTPHEADER,     array('Content-Type : application/x-www-form-urlencoded')); 

	$result = curl_exec($ch);
	$http_status = curl_getinfo($ch, CURLINFO_HTTP_CODE);	
	
	if($http_status !== 200){
		echo "\n\nERROR - Response code: " . $http_status . "\n" . $result;		
		exit;
	}

	curl_close($ch);
	$json = json_decode($result, true);
	
	echo $result . "\n";


}