A PHP JSONP proxy script

readme.txt

Want to fetch JSON from cross-origin and it doesn't serve JSONP?
One solution is a proxy PHP script that will fetch the JSON and
return it as JSONP.

As a pre-requisite, your server must have PHP and PHP-curl installed:
e.g.
 - sudo apt-get install libapache2-mod-php5 php5-curl
 - sudo /etc/init.d/apache2 restart
 
Example usage with jQuery:
 
var data_url = "http://dataserver/data.json";
S.getJSON('http://proxyserver/JSONProxy.php?callback=?&src='+data_url, function(data) {
  . . .
});

JSONProxy.php

<?php header('content-type: application/json; charset=utf-8');

# Curl / proxy parts of this script from:
# https://webster.cs.washington.edu/course-website/16au/lectures/slides/proxy.phps

$url = $_GET['src'];
$data = array();

# Open the cURL session
$curlSession = curl_init();
curl_setopt($curlSession, CURLOPT_URL, $url);
curl_setopt($curlSession, CURLOPT_HEADER, 1);
curl_setopt($curlSession, CURLOPT_RETURNTRANSFER,1);
curl_setopt($curlSession, CURLOPT_TIMEOUT,30);
curl_setopt($curlSession, CURLOPT_SSL_VERIFYHOST, 1);

# Send the request and store the result in an array
$response = curl_exec ($curlSession);

# Check that a connection was made
if (curl_error($curlSession)){
  # If it wasn't...
  print curl_error($curlSession);
} else {
  #clean duplicate header that seems to appear on fastcgi with output buffer on some servers!!
  $response = str_replace("HTTP/1.1 100 Continue\r\n\r\n","",$response);
  $ar = explode("\r\n\r\n", $response, 2); 
  $header = $ar[0];
  $body = $ar[1];
  $data = $body;
}

# Output the JSONP callback with data
echo $_GET['callback'] . '('.json_encode($data).')';