Extract $_GET/$_POST params and pass them to constructor

For example, $_GET contains id=10, var=100. How can I extract and pass them to constructor p开发者_StackOverflow中文版ublic function __construct($id, $var) Something like this new Test(extract($_GET));

Use ReflectionMethod from reflection API to check what's the signature of __construct() method.

class MyClass {
        public function __construct($id, $title, $slug = null) {
                var_dump($id, $title, $slug);
        }
}

$object = new MyClass();

$method = new ReflectionMethod($object, '__construct');
$parameters = $method->getParameters();

$parameters contains an array of ReflectionParameter objects.

Now you need to prepare an array of parameters that will be used by ReflectionMethod::invokeArgs():

$invokeParameters = array();

foreach ($parameters as $parameter) {
    $value = $_REQUEST[$parameter->getName()]; 

    $invokeParameters[$parameter->getPosition()] = $value;
}

$method->invokeArgs($object, $invokeParameters);

Of course you should add a few conditions to check whether all mandatory parameters exist within $_REQUEST, throw exception if not, etc.

I presume you know what values you are looking for from the URL?

$_GET in PHP is just an associative array. So if my url looks like this:

http://example.com/index.php?var1=foo&var2=bar

I can get those variables like so:

new Test($_GET['var1'], $_GET['var2']);

Be careful with $_GET as there is no safeguard that prevents me from changing my URL bar to

    http://example.com/index.php?var1=foo&var2=[malicious code]

So you should always treat it as untrusted.

Change the constructor to __construct($array); and the set you variables inside the construtor. It's not pretty and I would not recomend it, but it will work.

$_GET is an associative array. So you could get the key from $_GET to get the variable name. The value is obviously $_GET['key']