JS/PHP check wheather a url parameter exist

 <script>

function isQueryParamPresent(param) {

    // Assuming the URL we're checking is the current window location

    const queryParams = new URLSearchParams(window.location.search);

    // The `has` method returns true if the parameter is present

    return queryParams.has(param);

}

console.log( isQueryParamPresent('hk') );

</script>

===================================================

<?php

function isQueryParamPresent($param) {

    // Check if the parameter exists in the $_GET array

    return isset($_GET[$param]);

}

$paramName = 'hk';

if (isQueryParamPresent($paramName)) {

    echo "{$paramName} exists in the URL.";

} else {

    echo "{$paramName} does not exist in the URL.";

}