How to implement php drop-down menu and multi-level columns? (Code actual test)-PHP Tutorial-php.cn

How to implement php drop-down menu and multi-level columns? (Code actual test)

藏色散人

Release： 2023-04-03 17:50:02

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In website construction, the navigation bar usually displays a drop-down column. The PHP implementation of this function is not that simple. It requires a certain knowledge reserve related to database and PHP. So this article will introduce you to the functional implementation of the PHP secondary drop-down menu in a simple way so that you can understand and learn it.

This simple and easy-to-understand method is mainly implemented through html and css code. The specific example of the php drop-down menu code is as follows:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
</head>
<body>
<div id="nav">
    <ul>
        <li><a href="">首页</a></li>
        <li><a href="">笔记本电脑</a>
            <ul>
                <li><a href="#">索尼</a> </li>
                <li><a href="#">联想</a> </li>
            </ul>
        </li>
        <li><a href="">摄像机</a>
            <ul>
                <li><a href="#">松下</a> </li>
                <li><a href="#">佳能</a> </li>
            </ul>
        </li>
        <li><a href="">联系我们</a></li>
    </ul>
</div>
</body>
</html>

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style.css code is as follows:

<style>
        *{margin:0;padding: 0;list-style: none;text-decoration: none;}
        #nav{width: 500px;height: 40px;background: #ccc;margin: 0 auto;}
        ul{background: #aaa}
        ul li{float:left; display:block; height: 40px; line-height: 40px; padding: 0 20px; position: relative;}
        ul li:hover{background: #cea;}
        ul li ul li{float: none;}
        /*关键一：将二级菜单设置为display：none;*/
 ul li ul{position: absolute;top:40px;left: 0; display: none;}
        ul li ul li:hover{background: red;}
        /*关键二：在划过二级菜单从属的一级菜单时，设置为display:block;*/
 ul li:hover ul{display: block;}
    </style>

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How to implement php drop-down menu and multi-level columns? (Code actual test)

This article mainly introduces how to implement the PHP secondary drop-down menu in a simple way. I hope it will be helpful to friends in need.

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