Simple cURL wrapper function for GET, POST, PUT & DELETE methods

simple_curl.php

/**
 * Wrapper for easy cURLing
 *
 * @author Viliam Kopecký
 *
 * @param string HTTP method (GET|POST|PUT|DELETE)
 * @param string URI
 * @param mixed content for POST and PUT methods
 * @param array headers
 * @param array curl options
 * @return array of 'headers', 'content', 'error'
 */
function simple_curl($uri, $method='GET', $data=null, $curl_headers=array(), $curl_options=array()) {
	// defaults
	$default_curl_options = array(
		CURLOPT_SSL_VERIFYPEER => false,
		CURLOPT_HEADER => true,
		CURLOPT_RETURNTRANSFER => true,
		CURLOPT_TIMEOUT => 3,
	);
	$default_headers = array();

	// validate input
	$method = Strings::upper(trim($method));
	$allowed_methods = array('GET', 'POST', 'PUT', 'DELETE');

	if(!in_array($method, $allowed_methods))
		throw new \Exception("'$method' is not valid cURL HTTP method.");

	if(!empty($data) && !is_string($data))
		throw new \Exception("Invalid data for cURL request '$method $uri'");

	// init
	$curl = curl_init($uri);

	// apply default options
	curl_setopt_array($curl, $default_curl_options);

	// apply method specific options
	switch($method) {
		case 'GET':
			break;
		case 'POST':
			if(!is_string($data))
				throw new \Exception("Invalid data for cURL request '$method $uri'");
			curl_setopt($curl, CURLOPT_POST, true);
			curl_setopt($curl, CURLOPT_POSTFIELDS, $data);
			break;
		case 'PUT':
			if(!is_string($data))
				throw new \Exception("Invalid data for cURL request '$method $uri'");
			curl_setopt($curl, CURLOPT_CUSTOMREQUEST, $method);
			curl_setopt($curl, CURLOPT_POSTFIELDS, $data);
			break;
		case 'DELETE':
			curl_setopt($curl, CURLOPT_CUSTOMREQUEST, $method);
			break;
	}

	// apply user options
	curl_setopt_array($curl, $curl_options);

	// add headers
	curl_setopt($curl, CURLOPT_HTTPHEADER, array_merge($default_headers, $curl_headers));

	// parse result
	$raw = rtrim(curl_exec($curl));
	$lines = explode("\r\n", $raw);
	$headers = array();
	$content = '';
	$write_content = false;
	if(count($lines) > 3) {
		foreach($lines as $h) {
			if($h == '')
				$write_content = true;
			else {
				if($write_content)
					$content .= $h."\n";
				else
					$headers[] = $h;
			}
		}
	}
	$error = curl_error($curl);

	curl_close($curl);

	// return
	return array(
		'raw' => $raw,
		'headers' => $headers,
		'content' => $content,
		'error' => $error
	);
}