<?php
 
// REPLACE THE QUESTION MARK AND EVERYTHING AFTER IT
$string = 'https://www.google.com/search?q=Metallica+Turn+The+Page&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a&channel=sb';
 
$string = preg_replace('~\?.*~', '', $string);
 
print "\n\n".$string;
 
 
// REPLACE ALL OF THE PARAMS WITH DUMMY-PARAM
$string = 'https://www.google.com/search?q=Metallica+Turn+The+Page&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a&channel=sb';
 
$string = preg_replace('~[?&]\K([A-Z0-9+%]+)=.+?(?=&|$)~i', '$1=DUMMY-PARAM', $string);
 
print "\n\n".$string;
 
 
// REPLACE ALL OF THE KEYS WITH DUMMY-KEY
$string = 'https://www.google.com/search?q=Metallica+Turn+The+Page&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a&channel=sb';
 
$string = preg_replace('~[?&]\K[A-Z0-9+%]+=(.+?)(?=&|$)~i', 'DUMMY-KEY=$1', $string);
 
print "\n\n".$string;
 
 
// PULL OUT ALL KEYS/VALUES
$string = 'https://www.google.com/search?q=Metallica+Turn+The+Page&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a&channel=sb';
 
$string = preg_replace('~[?&]\K([A-Z0-9+%]+)=(.+?)(?=&|$)~i', "\n$1: $2", $string);
 
print "\n\n".$string;

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