xrsrke

(function (history, trackingId, options) {
    const getParameterByName = (paramName) => {
        var searchString = window.location.search.substring(1),
            i, val, params = searchString.split("&");
        for (i=0;i<params.length;i++) {
          val = params[i].split("=");
          if (val[0] == paramName) {
            return val[1] || undefined;
          }
        }

xrsrke

<?php

/**
 * array_merge_recursive does indeed merge arrays, but it converts values with duplicate
 * keys to arrays rather than overwriting the value in the first array with the duplicate
 * value in the second array, as array_merge does. I.e., with array_merge_recursive,
 * this happens (documented behavior):
 *
 * array_merge_recursive(array('key' => 'org value'), array('key' => 'new value'));
 *     => array('key' => array('org value', 'new value'));