How to implement the delete function of multi-select button in php

With the development of web applications, the technology of multi-select buttons is becoming more and more widely used. The main application scenario of multi-select buttons is when users need to select multiple list items. Developers can use the multi-select button component to implement this function. In actual use, deletion is a very common scenario for multi-select button components. This article will introduce how to use PHP to implement the deletion function of multi-select buttons.

First, we need to create a PHP file named delete.php. In this file, we need to define an array variable $items, which is used To simulate an array of multiple option lists, whose elements are the ids and names of the options, as shown below:

$items = array(
    array("id" => 1, "name" => "选项一"),
    array("id" => 2, "name" => "选项二"),
    array("id" => 3, "name" => "选项三"),
    array("id" => 4, "name" => "选项四"),
    array("id" => 5, "name" => "选项五")
);

Next, we need to display the multi-select button list on the page and implement the deletion operation. To achieve this, we can use a form to handle the user's input and add a checkbox for each item in the multi-select button list, and the user can remove the option by checking the checkbox. Please note that in the form we need to use the POST method to submit data and set the variable name checkbox[] in each checkbox. The following is a code example:

<form method="post" action="">
    <ul>
        <?php foreach ($items as $item): ?>
            <li>
                <input type="checkbox" name="checkbox[]" value="<?php echo $item[&#39;id&#39;]; ?>">
                <?php echo $item[&#39;name&#39;]; ?>
            </li>
        <?php endforeach; ?>
    </ul>
    <input type="submit" name="submit" value="删除">
</form>

In the form, we added the name="submit" attribute to the button so that in the next PHP code we can check whether the button was clicked .

Next, we need to write PHP code to detect whether the submit button is clicked. If so, we need to implement the deletion operation of multiple options. We can find the checked multi-check box by looping through the array $items and delete the corresponding item from the array. After deleting the item, we should regenerate a new multi-select button list and output it to the page. Here is the complete PHP code example:

if(isset($_POST['submit'])) {
    $checkboxes = isset($_POST['checkbox']) ? $_POST['checkbox'] : array();

    foreach ($items as $key => $item) {
        if(in_array($item['id'], $checkboxes)){
            unset($items[$key]);
        }
    }

    // 重新生成多选按钮列表
    $html = '<ul>';
    foreach ($items as $item) {
        $html .= '<li><input type="checkbox" name="checkbox[]" value="&#39;.$item[&#39;id&#39;].&#39;">'.$item['name'].'</li>';
    }
    $html .= '</ul>';

    echo $html;
}

In this code, we first detect whether the submit button was clicked. If clicked, we check if any checkbox is selected. If so, we loop through the array $items to find the option corresponding to the selected checkbox and remove the corresponding item from the array. Finally, we regenerate the new multi-select button list and output it onto the page.

Summary:

This article introduces how to use PHP to implement the delete function of multi-select buttons. We first use an array to simulate multiple lists of options and present a checkbox for each option to the user via a form. When the user clicks the submit button, we can check the checked checkbox and remove the corresponding item from the array. Finally, we regenerate the new multi-select button list and output it onto the page. The implementation of this function can reduce the burden on developers and improve the user experience of web applications.

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