curl.php

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<?php
/*
Sean Huber CURL library
Session-based caching added by Mike Purvis

This library is a basic implementation of CURL capabilities.

==================================== USAGE ====================================
It exports the CURL object globally, so set a callback with setCallback($func).
(Use setCallback(array('class_name', 'func_name')) to set a callback as a func
that lies within a different class)
Then use one of the CURL request methods:

get($url);
post($url, $vars); vars is a urlencoded string in query string format.

Your callback function will then be called with 1 argument, the response text.
If a callback is not defined, your request will return the response text.
*/

class CURL {
	var $callback = false, $cache = false, $flush_cache = false;
	
	function setCallback($func_name) {
		$this->callback = $func_name;
	}
	
	function enableCache() {
		$this->cache = true;
		if (session_id() == "")
			session_start();
	}
	
	function flushCache() {
		unset($_SESSION['curl_cache']);
	}
	
	function doRequest($method, $url, $vars) {
		if ($this->cache)
		{
			$cache_key = md5(serialize(func_get_args()));
			
			if (!isset($_SESSION['curl_cache'])) $_SESSION['curl_cache'] = array();
			
			if (isset($_SESSION['curl_cache'][$cache_key]))
			{
				if ($this->callback)
				{
					$callback = $this->callback;
					$this->callback = false;
					return call_user_func($callback, $_SESSION['curl_cache'][$cache_key]);
				} else {
					return $_SESSION['curl_cache'][$cache_key];
				}				
			}
		}
	
		$ch = curl_init();
		curl_setopt($ch, CURLOPT_URL, $url);
		curl_setopt($ch, CURLOPT_HEADER, 1);
		curl_setopt($ch, CURLOPT_USERAGENT, $_SERVER['HTTP_USER_AGENT']);
		curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
		curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
		curl_setopt($ch, CURLOPT_COOKIEJAR, 'cookie.txt');
		curl_setopt($ch, CURLOPT_COOKIEFILE, 'cookie.txt');
		
		if ($method == 'POST') {
			curl_setopt($ch, CURLOPT_POST, 1);
			curl_setopt($ch, CURLOPT_POSTFIELDS, $vars);
		}
		$data = curl_exec($ch);
		curl_close($ch);
		
		if ($data) {
			if ($this->callback)
			{
				$callback = $this->callback;
				$this->callback = false;
				return call_user_func($callback, $_SESSION['curl_cache'][$cache_key] = $data);
			} else {
				return $_SESSION['curl_cache'][$cache_key] = $data;
			}
		} else {
			return curl_error($ch);
		}
	}
	
	function get($url) {
		return $this->doRequest('GET', $url, 'NULL');
	}
	
	function post($url, $vars) {
		return $this->doRequest('POST', $url, $vars);
	}
}
?>