function p($var)
{
    if(is_bool($var)){
        var_dump($var);
    }elseif(is_null($var)){
        var_dump(null);
    }else{
        echo "<pre style=
                        '
                        position:relative;
                        z-index:999;
                        padding:10px;
                        border-radius:5px;
                        background:#ccc;
                        border:1px solid #aaa;
                        font-size:14px;
                        line-height:18px;opacity:0.9;
                        '
                        >".print_r($var,true)."</pre>";
    }
}

这只是一个自定义的打印内容的函数，只是稍微用html样式修饰了一下。我把代码贴出来。很容易就明白了。

function p($var)
{
    if(is_bool($var)){
        var_dump($var);
    }elseif(is_null($var)){
        var_dum(null);
    }else{
        echo "<pre style='position:relative;z-index:999;padding:10px;border-radius:5px;background:#ccc;border:1px solid #aaa;font-zize:14px;line-height:18px;opacity:0.9;'>".print_r($var,true)."</pre>";
    }    
}