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Home/ Questions/Q 7004
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Alek Richter
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Alek RichterEnlightened
Asked: December 23, 20212021-12-23T08:28:42+00:00 2021-12-23T08:28:42+00:00

Remove all special characters from a string [duplicate]

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I am facing an issue with URLs, I want to be able to convert titles that could contain anything and have them stripped of all special characters so they only have letters and numbers and of course I would like to replace spaces with hyphens.

How would this be done? I’ve heard a lot about regular expressions (regex) being used…

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  1. Alek Richter Enlightened
    2021-12-23T08:29:20+00:00Added an answer on December 23, 2021 at 8:29 am

    This should do what you’re looking for:

    function clean($string) {
       $string = str_replace(' ', '-', $string); // Replaces all spaces with hyphens.
    
       return preg_replace('/[^A-Za-z0-9\-]/', '', $string); // Removes special chars.
    }
    

    Usage:

    echo clean('a|"[email protected]£de^&$f g');
    

    Will output: abcdef-g

    Edit:

    Hey, just a quick question, how can I prevent multiple hyphens from being next to each other? and have them replaced with just 1?

    function clean($string) {
       $string = str_replace(' ', '-', $string); // Replaces all spaces with hyphens.
       $string = preg_replace('/[^A-Za-z0-9\-]/', '', $string); // Removes special chars.
    
       return preg_replace('/-+/', '-', $string); // Replaces multiple hyphens with single one.
    }
    
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