php custom menu modification

PHP Custom Menu Modification

Custom menus are a necessity in modern websites, providing users with a fast and intuitive navigation experience. During the development process, we often need to modify existing menu functions according to different needs. This article will introduce how to modify PHP custom menus to help developers easily modify menus.

1. Preliminary preparations

First of all, we need an existing menu code for modification. Here, we use a basic PHP menu code as an example. This sample menu shows different categories and the subcategories beneath them.

<ul>
    <?php
        $categories = array(
            'Category 1' => array(
                'Subcategory 1',
                'Subcategory 2',
                'Subcategory 3'
            ),
            'Category 2' => array(
                'Subcategory 4',
                'Subcategory 5'
            )
        );

        foreach ($categories as $category => $subcategories) {
            echo '<li>' . $category . '<ul>';
            foreach ($subcategories as $subcategory) {
                echo '<li>' . $subcategory . '</li>';
            }
            echo '</ul></li>';
        }
    ?>
</ul>

This code will generate a basic vertical menu that looks like this:

Category 1

• Subcategory 1
• Subcategory 2
• Subcategory 3

Category 2

• Subcategory 4
• Subcategory 5

2. Add menu modifications Code

Now let’s add some code to allow the menu to be modified in the background. First, add the following code at the top of your menu code:

<?php
    // 声明一个变量，用于存储菜单选项
    $menu_items = array(
        'Category 1' => array(
            'Subcategory 1',
            'Subcategory 2',
            'Subcategory 3'
        ),
        'Category 2' => array(
            'Subcategory 4',
            'Subcategory 5'
        )
    );

    // 如果有提交表单
    if($_SERVER["REQUEST_METHOD"] == "POST"){
        // 取出 identifier 值
        $identifier = $_POST['identifier'];
        
        // 取出选项值
        $selected_items = $_POST['selected_items'];
        
        // 更新菜单选项
        $menu_items[$identifier] = $selected_items;
    }
?>

This code creates an array $menu_items that contains all the current menu options. Then, when a form is submitted, it detects the POST data, extracts the menu identifiers and selected options that need to be modified, and updates them into $menu_items.

Next, we need to add form controls to the menu code to allow the menu to be modified. Add the following code below each menu item:

<li>
    <?php
        // 输出当前选项
        echo $category;
    ?>
    <form method="POST">
        <input type="hidden" name="identifier" value="<?php echo $category; ?>" />
        <select name="selected_items[]" multiple>
            <?php
                foreach($subcategories as $subcategory) {
                    $selected = (in_array($subcategory, $menu_items[$category])) ? 'selected' : '';
                    echo '<option ' . $selected . ' value="' . $subcategory . '">' . $subcategory . '</option>';
                }
            ?>
        </select>
        <button type="submit">Save</button>
    </form>
</li>

This code will add a select list and a submit button below each menu item. The selection list will list all subcategories under this category, and the user can select the subcategories to be added to the menu item. When the user clicks the submit button, the form submits and the PHP code in the above code is executed to update the menu items.

3. Processing the modified menu operations

Now, when the user submits the form and modifies the menu item, what operations do we need to perform? For example, we can save menu items to a database, or output them to a configuration file, or re-update them directly in the menu code.

Here, we assume that you want to output the modified menu directly to the website. You can output the modified menu directly in your PHP code. To do this, add the following code to the end of the menu code:

<ul>
    <?php
        foreach ($menu_items as $category => $subcategories) {
            echo '<li>' . $category . '<ul>';
            foreach ($subcategories as $subcategory) {
                echo '<li>' . $subcategory . '</li>';
            }
            echo '</ul></li>';
        }
    ?>
</ul>

This will loop through the modified menu and display it on the website.

4. Summary

In this article, we introduced how to modify the PHP custom menu by adding code. We showed how to use forms to handle the addition and modification of menu items, and we demonstrated how to output the modified options in the menu code. Hope this article is helpful to you.

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