CodeIgniter Get File Name, type, Size, Extension Before Upload

The $_FILES superglobal array allows users to get the file information including the file name, file type, file size, and file extension. In this tutorial, you will learn how to get the file name, type, and extension before uploading a file in CodeIgniter 4, 3.

How to Get File Name, File type, Extension Before Upload in CodeIgniter

Here are the steps to get the file name, file type, and extension before uploading in CodeIgniter 4, 3:

• Step 1: Create a form to upload the file
• Step 2: Handle the file upload request
• Step 3: Get the file information
• Step 4: Get the file extension
• Step 5: Rename the file
• Step 6: Move the file to the server
• Step 7: Display file information to the user

Step 1: Create a form to upload the file

Create a form with input field that allows users to choose a file for upload.

<form method="post" action="<?php echo base_url('upload'); ?>" enctype="multipart/form-data">
  <input type="file" name="userfile">
  <input type="submit" name="submit" value="Upload">
</form>

Step 2: Handle the file upload request

To handle the file upload request, create method in controller.

public function upload() {
  // Code to handle file upload
}

Step 3: Get the file information

In the controller method, you can use the $_FILES superglobal array to get the file information including the file name, file type, and file size:

public function upload() {
  $file_name = $_FILES['userfile']['name'];
  $file_type = $_FILES['userfile']['type'];
  $file_size = $_FILES['userfile']['size'];
  // Code to handle file upload
}

Step 4: Get the file extension

To get the file extension, you can use the pathinfo() function:

public function upload() {
  $file_name = $_FILES['userfile']['name'];
  $file_type = $_FILES['userfile']['type'];
  $file_size = $_FILES['userfile']['size'];
  $file_ext = pathinfo($file_name, PATHINFO_EXTENSION);
  // Code to handle file upload
}

Step 5: Rename the file

To rename the file before uploading it to the server, Use uniqid() function to generate a unique name for the file:

public function upload() {
  $file_name = $_FILES['userfile']['name'];
  $file_type = $_FILES['userfile']['type'];
  $file_size = $_FILES['userfile']['size'];
  $file_ext = pathinfo($file_name, PATHINFO_EXTENSION);
  $new_file_name = uniqid().'.'.$file_ext;
  // Code to handle file upload
}

Step 6: Move the file to the server

Use the move_uploaded_file() function to move the file to folder or directory:

public function upload()
{
   // Retrieve file information
   $file_name = $_FILES['file']['name'];
   $file_type = $_FILES['file']['type'];
   $file_size = $_FILES['userfile']['size'];
   $file_ext = pathinfo($_FILES['file']['name'], PATHINFO_EXTENSION);

   // Upload file to server
   move_uploaded_file($_FILES['file']['tmp_name'], './uploads/' . $file_name);
}

Step 7: Display file information to the user

To show uploaded file information. Here is an example code:

<h2>File Upload Results</h2>
<p>File name: <?php echo $file_name; ?></p>
<p>File type: <?php echo $file_type; ?></p>
<p>File extension: <?php echo $file_ext; ?></p>

Conclusion

This tutorial taught you how to get file names, types, and extensions in CodeIgniter applications.

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