PHP: Procedural to Object Oriented API
If you want to to port old procedural-only API to a new shiny object oriented fashion, a proxy class is your solution.
For example, we will expose the old procedural call for the cURL lib with an self-contained, object oriented API.
From the PHP documentation for cURL lib :
http://www.php.net/manual/en/ref.curl.php
we can see that cURL functions all starts with curl_ and all of them ( only exception for curl_init and curlmultiinit ) wants the curl resource as their very first parameter.
We start building a container class for storing the current curl resource as a private property :
class cURL {
private $curl = null;
}and we write a __call magic method for proxying calls to their procedural version, with the "curl_" prefix omitted for syntactic sugar.
public function __call($n,$p){
if($n=='init' || $n=='multi_init'){
return $this->curl =
call_user_func_array('curl_'.$n,$p);
} else {
array_unshift($p,$this->curl);
return call_user_func_array('curl_'.$n,$p);
}
}Now we add a constructor to our class for initializing the resource
public function __construct($url = null){
return $this->init($url);
}And finally we have our complete class:
class cURL {
private $curl = null;
public function __construct($url = null){
return $this->init($url);
}
public function __call($n,$p){
if($n=='init' || $n=='multi_init'){
// Close resource if opened
if($this->curl) curl_close($this->curl);
return $this->curl = call_user_func_array('curl_'.$n,$p);
} else {
array_unshift($p,$this->curl);
return call_user_func_array('curl_'.$n,$p);
}
}
}And this is an example of use
$http = new cURL("http://graph.facebook.com/CaffeinaLab");
$http->setopt(CURLOPT_HEADER, 0);
$http->setopt(CURLOPT_RETURNTRANSFER, 1);
echo $http->exec();
$http->close();You can find the class and the example here :
https://gist.github.com/lastguest/4740772