美化打印数组

function dump($vars, $label = '', $return = false) {
    if (ini_get('html_errors')) {
        $content = "<pre>
";
        if ($label != '') {
            $content .= "<strong>{$label} :</strong>
";
        }
        $content .= htmlspecialchars(print_r($vars, true));
        $content .= "
</pre>
";
    } else {
        $content = $label . " :
" . print_r($vars, true);
    }
    if ($return) { return $content; }
    echo $content;
    return null;
}