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How to use a controller to process form data in the CodeIgniter framework

PHPz

Jul 28, 2023 pm 11:41 PM

codeignitercontrollerform data

How to use a controller (Controller) to process form data in the CodeIgniter framework

CodeIgniter is a simple and powerful PHP framework that provides many useful functions to make developing web applications easier and efficient. Manipulating form data is one of the very common tasks in web development. This article will introduce how to use controllers in the CodeIgniter framework to process form data.

First, we need to create a form page. In CodeIgniter, forms can be created using HTML. The following example shows a simple form page, which contains an input box, a submit button and a hidden field:

<!DOCTYPE html>
<html>
<head>
    <title>表单示例</title>
</head>
<body>
    <h2 id="表单示例">表单示例</h2>
    <?php echo form_open('form/process'); ?>
    <label for="name">姓名：</label>
    <input type="text" name="name" id="name" required><br><br>
    <input type="hidden" name="hidden_field" value="隐藏字段值">
    <input type="submit" value="提交">
    <?php echo form_close(); ?>
</body>
</html>

In this form, the form_open() function will generate a <form> element, the <code>action attribute value is form/process, which means that after the form is submitted, it will be processed by process## in the form controller # method to handle.

Next, we need to create a

form controller for processing form data. In the CodeIgniter framework, the controller class needs to inherit the CI_Controller class and must be saved in the application/controllers directory. The following is a sample controller code that handles form data:

<?php
defined('BASEPATH') OR exit('No direct script access allowed');

class Form extends CI_Controller {

    public function process() {
        // 加载表单验证类
        $this->load->library('form_validation');

        // 设置表单验证规则
        $this->form_validation->set_rules('name', '姓名', 'required');

        if ($this->form_validation->run() == FALSE) {
            // 表单验证失败时显示错误信息
            $this->load->view('form_view');
        } else {
            // 表单验证成功时处理表单数据
            $name = $this->input->post('name');
            $hidden_field = $this->input->post('hidden_field');

            // 进行数据处理或数据库操作

            // 显示成功页面
            $this->load->view('success_view');
        }
    }
}

In the above controller code, we first load CodeIgniter's form validation class

form_validation and set The name field is required.

Next, we use the

$this->form_validation->run() method to perform form validation. If the form validation fails, we will reload the form page and display the error message. . If the form verification is successful, we can obtain the form data through the $this->input->post() method and perform corresponding processing or database operations. Finally, we can load a success page to display the processing results.

Throughout the process, the CodeIgniter framework provides us with many convenient classes and methods to make form processing simple and efficient.

Through the above sample code, we can find that using controllers to process form data is a simple and effective method in the CodeIgniter framework. We only need to set the form validation rules, obtain the form data, and process it accordingly. The CodeIgniter framework provides a wealth of functions and class libraries to make form processing easier while providing good security and scalability.

In summary, the CodeIgniter framework provides a very convenient way to process form data. By rationally using controllers and related class libraries, we can simplify the form processing process and improve development efficiency. I hope this article helped you better understand the method of using controllers to handle form data in the CodeIgniter framework.

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