Yii2: отладка переменных

functions.php

<?php

    /**
     * Debug function
     * d($var);
     */
    function d($var,$caller=null)
    {
        if (!isset($caller)){
            $caller = array_shift(debug_backtrace(1));
        }
        echo '<code>File: '.$caller['file'].' / Line: '.$caller['line'].'</code>';
        echo '<pre>';
        yii\helpers\VarDumper::dump($var, 10, true);
        echo '</pre>';
    }

    /**
     * Debug function with die() after
     * dd($var);
     */
    function dd($var)
    {
        $caller = array_shift(debug_backtrace(1));
        d($var,$caller);
        die();
    }

web.php

/* Include debug functions */
require_once(__DIR__.'/functions.php');