Codeigniter 中的文件上传验证

问题描述

我正在尝试验证图片上传的文件上传，但它没有像其他字段一样得到验证.我正在使用 Form_Validation.php 过程进行验证.

I am trying to validate file upload for image uploading, but it is not getting the validation like other fields. I am using Form_Validation.php process for validation.

图片上传数组:

array(
            'field'=>'image',
            'label' => 'Image',
            'rules' => 'required'
        )

当我尝试上传图像时，它没有像需要等那样响应.我还想验证它的 .jpg 等以及如何在不正确的文件上设置文件值，例如.jpg 我们尝试上传 .pdf" 就像我们设置输入字段的值 set_value('field name') 等.

when i try to upload the image it did not response like it is required etc. I also want to validate it for .jpg etc and "how to set the file value on incorrect file like instead of .jpg we try to upload the .pdf" like we set the value of input field set_value('field name') etc.

我查了很多问题，也尝试使用call方法，但没能解决.

I checked a lot of questions and also try to use call method, but did not able to fix it.

更新:

请提供带有代码示例的详细答案.请在示例中使用 form_validation.php 方式并提供回调示例代码，以便我可以阅读/学习并相应地修改它.

Please provide detail answer with code example. Please use the form_validation.php way in example and also provide the callback example code, so i can read / learn and modify it accordingly.

更新 2:

 public function Task()
    {
        if ($this->form_validation->run('Sub_Admin/task') == FALSE) {
            $this->data['Task'] = $this->bm->get_usr();
            $data['title'] = "Add New Task";
            $this->load->view('Subadmin/header',$data);
            $this->load->view('Subadmin/nav');
            $this->load->view('Subadmin/sidebar');
            $this->load->view('Subadmin/task', $this->data);
            $this->load->view('Subadmin/footer');
        }
        else
        {

            $config['upload_path'] = './taskimages/'; //The path where the image will be save
            $config['allowed_types'] = 'gif|jpg|png'; //Images extensions accepted
            $config['max_size'] ='10048'; //The max size of the image in kb's
            //$config['max_width']  = '1024'; //The max of the images width in px
            //$config['max_height']  = '768'; //The max of the images height in px
            $config['overwrite'] = FALSE; //If exists an image with the same name it will overwrite. Set to false if don't want to overwrite
            $this->load->library('upload', $config); //Load the upload CI library
            $this->load->initialize($config);
            $this->upload->do_upload('task');
            $file_info = $this->upload->data();
            $file_name = $file_info['file_name'];
            $data = array(
                'Job_Title' => $this->input->post('jtitle'),
                'Priority' => $this->input->post('jnature'),
                'Assignee' => $this->input->post('assigne'),
                'Employee_Name' => $this->input->post('assignto'),
                'Due_Date' => $this->input->post('ddate'),
                'Reminder' => $this->input->post('reminder'),
                'Task_Image' => $file_name,
            );

            $this->bm->add_task($data);

        }
    }

我已经在使用 CI 上传类但它不起作用，现在我想从 form_validation 端验证图像/文件.

推荐答案

我为你的问题写了一个完整的例子，希望对你有所帮助.在以下代码中，我使用了 CI 的表单验证回调和表单验证自定义错误消息.

I wrote a complete example for your problem, I hope it will help. In the following code I am using CI's Form validation callback and Form Validation Custom Error Messages.

控制器: Front.php

Controller: Front.php

class Front 扩展 CI_Controller {

class Front extends CI_Controller {

public function index() {
    $this->load->view('form');
}

public function upload_image() {
    $this->load->library('form_validation');
    if ($this->form_validation->run('user_data') == FALSE) {
        $this->load->view('form');
    }
    else {
        echo 'You form Submitted Successfully ';
    }
}

public function validate_image() {
    $check = TRUE;
    if ((!isset($_FILES['my_image'])) || $_FILES['my_image']['size'] == 0) {
        $this->form_validation->set_message('validate_image', 'The {field} field is required');
        $check = FALSE;
    }
    else if (isset($_FILES['my_image']) && $_FILES['my_image']['size'] != 0) {
        $allowedExts = array("gif", "jpeg", "jpg", "png", "JPG", "JPEG", "GIF", "PNG");
        $allowedTypes = array(IMAGETYPE_PNG, IMAGETYPE_JPEG, IMAGETYPE_GIF);
        $extension = pathinfo($_FILES["my_image"]["name"], PATHINFO_EXTENSION);
        $detectedType = exif_imagetype($_FILES['my_image']['tmp_name']);
        $type = $_FILES['my_image']['type'];
        if (!in_array($detectedType, $allowedTypes)) {
            $this->form_validation->set_message('validate_image', 'Invalid Image Content!');
            $check = FALSE;
        }
        if(filesize($_FILES['my_image']['tmp_name']) > 2000000) {
            $this->form_validation->set_message('validate_image', 'The Image file size shoud not exceed 20MB!');
            $check = FALSE;
        }
        if(!in_array($extension, $allowedExts)) {
            $this->form_validation->set_message('validate_image', "Invalid file extension {$extension}");
            $check = FALSE;
        }
    }
    return $check;
}

}

查看: form.php

<!DOCTYPE html>
<html>
<head>
    <title>Image Upload</title>
</head>
<body>
    <h1><a href="<?= base_url() ?>">Form</a></h1>
    <?php if(!empty(validation_errors())): ?>
        <p><?= validation_errors() ?></p>
    <?php endif; ?>
    <?= form_open('front/upload_image', ['enctype' => "multipart/form-data"]) ?>
    <label>Name: </label><input type="text" name="name" value="<?= set_value('name') ?>"></label>
    <label>E-mail: </label><input type="email" name="email" value="<?= set_value('email') ?>"></label>
    <input type="file" name="my_image">
    <button type="submit">Submit</button>
    <?= form_close() ?>
</body>
</html>

form_validation.php

$config = array(
        'user_data' => array(
                array(
                        'field' => 'name',
                        'label' => 'Name',
                        'rules' => 'trim|required'
                ),
                array(
                        'field' => 'email',
                        'label' => 'Email',
                        'rules' => 'trim|required|valid_email'
                ),
                array(
                        'field' => 'my_image',
                        'label' => 'Image',
                        'rules' => 'callback_validate_image'
                )
        )
);

在上面的例子中，首先我验证了 name 和 email 并且对于图像我调用了 validate_image 函数来验证它，因为form_validation 库不提供图像验证，但我有回调来进行自定义验证，validate_image 将检查图像内容类型，然后检查图像文件大小，然后检查图像扩展名，如果没有满足任何这些要求，它会使用 form_validation 库的 set_message() 函数为每个需求设置错误消息.

In above example first I am validating the name and email and for the Image I am calling the validate_image function to validate it, since form_validation library does not provide image validation but i has callbacks to do custom validations, the validate_image will check image content type then check image file size and then check image extension if any of these requirements are not fulfilled it will set error message for each requirement using set_message() function of form_validation library.

这篇关于Codeigniter 中的文件上传验证的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持跟版网！