Pick Url String in PHP

Question

I’m creating a commentary system that can’t be "flooded". When informing the string url to the client, the example is just below, I can’t get the string value of the given url. It would need to be in Php. The value of the string in the url varies according to the client.

https://malydesigner.com/depoimento_cliente.php?senha=102

$password=$_SERVER['QUERY_STRING'];