How can I replace a string containing a lot of ?myuser=12122 ?myuser=5457 ... with empty string so that it doesn't show ?myuser=number inside the string? 
I think I should use regex? 
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62answers:
3
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                A: 
                
                
              
            The question mark is a special character in regular expressions, so you must quote it. Apart from that, it's quite straight forward:
$result = preg_replace('/\?myuser=[0-9]+/', '', $source);
                  Boldewyn
                   2010-03-11 14:20:25
                
              `\n` is a new line. `\d` are numbers.
                  Boldewyn
                   2010-03-11 14:21:46
                ...which is easy to remember if you stop thinking of _numbers_ but instead think of it as _digits_
                  dbemerlin
                   2010-03-11 14:25:34