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  • Converting all underscore connected letters to uppercase in php

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    In PHP if we want to replace all underscore connected letters to upper case then we can use the php function called "preg_replace_callback" .

    For example if we have string "kp_o_zmq_k" then the output becomes "kpOZmqK".

    See the example below:

    $ptn = "/_[a-z]?/";
    $str = "kp_o_zmq_k";
    $result = preg_replace_callback($ptn,"callbackhandler",$str);
    // print the result
    echo $result;
    
    function callbackhandler($matches) {
        return strtoupper(ltrim($matches[0], "_"));
    }

    Hope this helps!

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