Add Browser Language smartcode on Fluent Forms Editor

brpwser-smartcode-fluentform.php

<?php

/*
 * Add Browser Language smartcode on Fluent Forms Editor 
 */
add_filter('fluentform_editor_shortcodes', function ($groups) {
    $groups[0]['shortcodes']['{browser_lang}'] = 'Browser Language';
    return $groups;
});
add_filter('fluentform_editor_shortcode_callback_browser_lang', function ($val) {
    if (isset($_SERVER["HTTP_ACCEPT_LANGUAGE"])) {
        $http_accept = $_SERVER["HTTP_ACCEPT_LANGUAGE"];
    } else {
        return 'en-us';
    }

    $deflang = 'en-us';

    if(isset($http_accept) && strlen($http_accept) > 1)  {
        # Split possible languages into array
        $x = explode(",",$http_accept);
        foreach ($x as $val) {
            #check for q-value and create associative array. No q-value means 1 by rule
            if(preg_match("/(.*);q=([0-1]{0,1}.\d{0,4})/i",$val,$matches))
                $lang[$matches[1]] = (float)$matches[2];
            else
                $lang[$val] = 1.0;
        }

        #return default language (highest q-value)
        $qval = 0.0;
        foreach ($lang as $key => $value) {
            if ($value > $qval) {
                $qval = (float)$value;
                $deflang = $key;
            }
        }
    }

    return strtolower($deflang);
 
});