PHP implements adaptive navigation

As mobile devices such as mobile phones and tablets become more and more common in people’s daily lives, how to provide a friendly web browsing experience for these small-screen devices has become a problem that developers have to face. This article will introduce how to implement adaptive navigation using PHP to provide a better user experience on different screen sizes.

1. Ideas for designing adaptive navigation

In modern web design, in order to adapt to various terminal sizes, people usually adopt the method of responsive web design (Responsive Web Design). Simply put, it uses CSS media queries to adapt to different device sizes, thereby bringing a more friendly user experience. For the navigation bar, we can use horizontal and vertical layouts according to the screen width, as shown in the figure below:

When the screen width is larger, the horizontal layout is used, and each navigation link is arranged horizontally in turn; When the screen width is small, a vertical layout is adopted, and each navigation link is arranged vertically. This not only makes it easier for users to operate on a small screen, but also avoids line breaks when the horizontal arrangement is too long.

Next, we will implement adaptive navigation through PHP code.

2. PHP implements adaptive navigation

When designing navigation for a web page, we usually save the navigation link in an array or database, so that the page can be updated easily. In PHP, we can get the navigation link array through the following code:

$nav_links = array(
    '首页' => 'index.php',
    '新闻' => 'news.php',
    '产品' => 'product.php',
    '关于我们' => 'about.php'
);

Then, we can use CSS to set styles for the navigation bar at different widths, as shown below:

/* 导航栏样式 */
nav {
    margin: 0;
    padding: 0;
}
/* 水平布局 */
@media screen and (min-width: 480px) {
    nav ul {
        list-style: none;
        margin: 0;
        padding: 0;
        display: flex;
        justify-content: center;
    }
    nav li {
        padding: 0 10px;
    }
}
/* 垂直布局 */
@media screen and (max-width: 479px) {
    nav ul {
        list-style: none;
        margin: 0;
        padding: 0;
    }
    nav li {
        margin: 10px 0;
    }
}

Continue Next, we use PHP code to select the appropriate navigation bar layout based on the screen width. The specific implementation is as follows:

<?php
    $nav_links = array(
        '首页' => 'index.php',
        '新闻' => 'news.php',
        '产品' => 'product.php',
        '关于我们' => 'about.php'
    );
    $screen_width = $_SERVER['HTTP_USER_AGENT'] ? (int) $_SERVER['HTTP_USER_AGENT'] : null;
    if ($screen_width && $screen_width < 480) {
        echo '<nav><ul>';
        foreach ($nav_links as $name => $link) {
            echo "<li><a href='$link'>$name</a></li>";
        }
        echo '</ul></nav>';
    } else {
        echo '<nav><ul>';
        foreach ($nav_links as $name => $link) {
            echo "<li><a href='$link'>$name</a></li>";
        }
        echo '</ul></nav>';
    }
?>

This code first obtains the screen width of the current device, and then selects different navigation layouts for rendering based on the screen width.

It should be noted that in order to obtain the screen width of the device in PHP, we use the $_SERVER['HTTP_USER_AGENT'] variable. This variable contains the User Agent string, which contains information about the user's device and browser. Although this method is not very accurate, it meets our needs in most cases.

3. Summary

Through the introduction of this article, readers can understand the method of using PHP to implement adaptive navigation. Using this method can make the website present a more friendly navigation bar layout on devices of different sizes, improving the user experience. Of course, in order to achieve a more perfect responsive design, readers can also learn more about CSS media queries, JavaScript and other related technologies to further improve their development skills.

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