search
HomeBackend DevelopmentPHP TutorialCodeigniter file upload class code example in PHP_PHP tutorial

Codeigniter file upload class code example

File upload class

CodeIgniter’s file upload class allows files to be uploaded. You can set up to upload files of a certain type and size.

Processing process

Common process for uploading files:

A form for uploading files, allowing the user to select a file and upload it.

When this form is submitted, the file is uploaded to the specified directory.

At the same time, the document will be verified to see if it meets the requirements you set.

Once the file is uploaded successfully, a confirmation window indicating successful upload will be returned.

Here is a short tutorial showing the process. Hereafter you will find relevant reference information.

Create upload form

Use a text editor to create a file named upload_form.php, copy the following code and save it in the applications/views/ directory:

You will see that a form helper function is used here to create the start tag of the form. File upload requires a multipart form, because this form helper function creates an appropriate statement for you. You will also see that we use an $error variable, which will display relevant error information when the user submits the form and an error occurs.

Successfully uploaded page

Use a text editor to create a file named upload_success.php. Copy the following code and save it in the applications/views/ directory:

Your file was successfully uploaded!

 $value):?>

 :

Controller

Using a text editor, create a controller named upload.php. Copy the following code and save it to the applications/controllers/ directory:

Load->helper(array('form', 'url')); } function index() { $this->load->view('upload_form', array('error' => ' ' )); } function do_upload() { $config['upload_path'] = './uploads/'; $config['allowed_types'] = 'gif|jpg|png'; $config['max_size'] = '100'; $config['max_width'] = '1024'; $config['max_height'] = '768'; $this->load->library('upload', $config); if ( ! $this->upload->do_upload()) { $error = array('error' => $this->upload->display_errors()); $this->load->view( 'upload_form', $error); } else { $data = array('upload_data' => $this->upload->data()); $this->load->view('upload_success' , $data); } } } ?>

Upload file directory

You will also need a destination folder to store the uploaded images. Create a file named uploads in the root directory and set the file's attributes to 777. (i.e. read and write)

Submit form

To submit your form, enter a URL similar to the following:

Example.com/index.php/upload/

You will see an upload form, select any (jpg, gif, or png) image to submit. If the path you set in the controller is correct, it will start working.

Initialize file upload class

Similar to some other CodeIgniter classes, the file upload class is initialized in the controller using the $this->load->library function:

$this->load->library('upload');

Once the file upload class is loaded, the object will be referenced through the following method: $this->upload

Preferences

Similar to other libraries, you will control which files are uploaded based on your preferences. In the controller, you create the following preferences:

$config['upload_path'] = './uploads/';

$config['allowed_types'] = 'gif|jpg|png';

 $config['max_size'] = '100';

 $config['max_width'] = '1024';

 $config['max_height'] = '768';

$this->load->library('upload', $config);

// Alternately you can set preferences by calling the initialize function. Useful if you auto-load the class:

  //[If you automatically loaded the upload class in the autoload.php file in the config folder, or loaded it in the constructor, you can call the initialization function initialize to load the settings. ————This bracket is translated by IT Tumbler, with my own understanding added】

$this->upload->initialize($config);

The above preferences will be fully implemented. Below are descriptions of all preference parameters.

Preference parameters

The following preference parameters are available. When you don't specify a preference parameter, the default value is as follows:

Preferences Default Value Option Description

 upload_path None None File upload path. The path must be writable, both relative and absolute paths are acceptable.

 allowed_types None None MIME types that allow uploading files; usually file extensions can be used as MIME types. Multiple types are allowed to be separated by vertical bars ‘|’

File_name None The file name you want to use

If this parameter is set, CodeIgniter will rename the uploaded file according to the file name set here. The extension in the file name must also be an allowed file type.

overwrite FALSE TRUE/FALSE (boolean) Whether to overwrite. When this parameter is TRUE, if a file with the same name is encountered when uploading a file, the original file will be overwritten; if this parameter is FALSE, when a file with the same name is uploaded, CI will add a number after the file name of the new file.

max_size 0 None The maximum allowed upload file size (in K). If this parameter is 0, there is no limit. Note: Usually PHP also has this restriction, which can be specified in the php.ini file. Usually the default is 2MB.

max_width 0 None The maximum width of the uploaded file (in pixels). 0 means no limit.

max_height 0 None The maximum height of the uploaded file (in pixels). 0 means no limit.

max_filename 0 None The maximum length of the file name. 0 means no limit.

 encrypt_name FALSE TRUE/FALSE (boolean) Whether to rename the file. If this parameter is TRUE, the uploaded file will be renamed to a random encrypted string. This is very useful when you want the file uploader to be unable to distinguish the file names of the files they upload. This option only works when overwrite is FALSE.

 remove_spaces TRUE TRUE/FALSE (boolean) When the parameter is TRUE, spaces in the file name will be replaced with underscores. Recommended.

Set preference parameters in the configuration file

If you don’t want to use the above method to set preferences, you can use a configuration file instead. Simply create a file called upload.php, add the $config array to the file, then save the file to: config/upload.php and it will be loaded automatically. When you save configuration parameters to this file, you do not need to manually load them using the $this->upload->initialize function.

Functions used

The following functions are used

$this->upload->do_upload()

Perform operations based on your preferred configuration parameters. Note: By default, the uploaded file comes from the file field named userfile in the submission form, and the form must be of type "multipart":

If you want to customize your own file domain name before executing the do_upload function, you can do so through the following methods:

 $field_name = "some_field_name";

$this->upload->do_upload($field_name)

$this->upload->display_errors()

If do_upload() returns failure, an error message will be displayed. This function does not automatically output, but returns data, so you can arrange it however you want.

Formatting error

The above function uses

by default

Mark error messages. You can set your own separator like this.

$this->upload->display_errors('

 , '

 );

$this->upload->data()

This is a helper function that returns an array of all relevant information about the file you uploaded.

Array

 (

 [file_name] => mypic.jpg

 [file_type] => image/jpeg

 [file_path] => /path/to/your/upload/

 [full_path] => /path/to/your/upload/jpg.jpg

 [raw_name] => mypic

 [orig_name] => mypic.jpg

 [client_name] => mypic.jpg

 [file_ext] => .jpg

 [file_size] => 22.2

 [is_image] => 1

 [image_width] => 800

 [image_height] => 600

 [image_type] => jpeg

 [image_size_str] => width="800" height="200"

 )

Explanation

Here is an explanation of the above array items.

 Item Description

file_name The name of the uploaded file (including extension)

file_type Mime type of the file

file_path The absolute path of the file excluding the file name

full_path The absolute path of the file including the file name

raw_name The part of the file name excluding the extension

orig_name The initial file name of the uploaded file. This only works if upload file rename (encrypt_name) is set.

Client_name is the file name of the uploaded file on the client.

file_ext file extension (including ‘.’)

 file_size image size, unit is kb

Is_image whether it is an image. 1 = is an image. 0 = Not an image.

Image_width image width.

 image_height image height

Image_type file type, that is, file extension (excluding ‘.’)

Image_size_str A string containing width and height. Used in an img tag.

www.bkjia.comtruehttp: //www.bkjia.com/PHPjc/769527.htmlTechArticlecodeigniter file upload class code example file upload class CodeIgniter's file upload class allows files to be uploaded. You can set up to upload files of a certain type and size. ...
Statement
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
What are some common problems that can cause PHP sessions to fail?What are some common problems that can cause PHP sessions to fail?Apr 25, 2025 am 12:16 AM

Reasons for PHPSession failure include configuration errors, cookie issues, and session expiration. 1. Configuration error: Check and set the correct session.save_path. 2.Cookie problem: Make sure the cookie is set correctly. 3.Session expires: Adjust session.gc_maxlifetime value to extend session time.

How do you debug session-related issues in PHP?How do you debug session-related issues in PHP?Apr 25, 2025 am 12:12 AM

Methods to debug session problems in PHP include: 1. Check whether the session is started correctly; 2. Verify the delivery of the session ID; 3. Check the storage and reading of session data; 4. Check the server configuration. By outputting session ID and data, viewing session file content, etc., you can effectively diagnose and solve session-related problems.

What happens if session_start() is called multiple times?What happens if session_start() is called multiple times?Apr 25, 2025 am 12:06 AM

Multiple calls to session_start() will result in warning messages and possible data overwrites. 1) PHP will issue a warning, prompting that the session has been started. 2) It may cause unexpected overwriting of session data. 3) Use session_status() to check the session status to avoid repeated calls.

How do you configure the session lifetime in PHP?How do you configure the session lifetime in PHP?Apr 25, 2025 am 12:05 AM

Configuring the session lifecycle in PHP can be achieved by setting session.gc_maxlifetime and session.cookie_lifetime. 1) session.gc_maxlifetime controls the survival time of server-side session data, 2) session.cookie_lifetime controls the life cycle of client cookies. When set to 0, the cookie expires when the browser is closed.

What are the advantages of using a database to store sessions?What are the advantages of using a database to store sessions?Apr 24, 2025 am 12:16 AM

The main advantages of using database storage sessions include persistence, scalability, and security. 1. Persistence: Even if the server restarts, the session data can remain unchanged. 2. Scalability: Applicable to distributed systems, ensuring that session data is synchronized between multiple servers. 3. Security: The database provides encrypted storage to protect sensitive information.

How do you implement custom session handling in PHP?How do you implement custom session handling in PHP?Apr 24, 2025 am 12:16 AM

Implementing custom session processing in PHP can be done by implementing the SessionHandlerInterface interface. The specific steps include: 1) Creating a class that implements SessionHandlerInterface, such as CustomSessionHandler; 2) Rewriting methods in the interface (such as open, close, read, write, destroy, gc) to define the life cycle and storage method of session data; 3) Register a custom session processor in a PHP script and start the session. This allows data to be stored in media such as MySQL and Redis to improve performance, security and scalability.

What is a session ID?What is a session ID?Apr 24, 2025 am 12:13 AM

SessionID is a mechanism used in web applications to track user session status. 1. It is a randomly generated string used to maintain user's identity information during multiple interactions between the user and the server. 2. The server generates and sends it to the client through cookies or URL parameters to help identify and associate these requests in multiple requests of the user. 3. Generation usually uses random algorithms to ensure uniqueness and unpredictability. 4. In actual development, in-memory databases such as Redis can be used to store session data to improve performance and security.

How do you handle sessions in a stateless environment (e.g., API)?How do you handle sessions in a stateless environment (e.g., API)?Apr 24, 2025 am 12:12 AM

Managing sessions in stateless environments such as APIs can be achieved by using JWT or cookies. 1. JWT is suitable for statelessness and scalability, but it is large in size when it comes to big data. 2.Cookies are more traditional and easy to implement, but they need to be configured with caution to ensure security.

See all articles

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Tools

PhpStorm Mac version

PhpStorm Mac version

The latest (2018.2.1) professional PHP integrated development tool

Atom editor mac version download

Atom editor mac version download

The most popular open source editor

WebStorm Mac version

WebStorm Mac version

Useful JavaScript development tools

SecLists

SecLists

SecLists is the ultimate security tester's companion. It is a collection of various types of lists that are frequently used during security assessments, all in one place. SecLists helps make security testing more efficient and productive by conveniently providing all the lists a security tester might need. List types include usernames, passwords, URLs, fuzzing payloads, sensitive data patterns, web shells, and more. The tester can simply pull this repository onto a new test machine and he will have access to every type of list he needs.

EditPlus Chinese cracked version

EditPlus Chinese cracked version

Small size, syntax highlighting, does not support code prompt function