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

CodeIgniter provides a lot of features that make web development easier and faster. In this tutorial, you will learn how to get the file name, file type, and extension before uploading a file in CodeIgniter 4, 3.

When developing web applications, it is often necessary to upload files such as images, videos, documents, etc. Before uploading a file, it is important to retrieve its name, file type, and extension. In this article, we will discuss how to get file name, file type, and extension before uploading a file in CodeIgniter.

Before uploading a file, it is important to get information about the file such as the file name, file type, and extension. This information can be used to validate the file and also to rename the file before uploading it to the server. In CodeIgniter, you can use the $_FILES superglobal array to get the file information. This array contains information about the uploaded file, including the file name, file type, file size, and file extension.

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

First, you need to create a form that allows users to upload files. The form should have an input field of type “file” to select the file.

<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

After the user submits the form, you need to handle the file upload request. You can create a controller method to handle the request.

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

Step 3: Get the file information

Inside the controller method, you can use the $_FILES superglobal array to get the file information. The $_FILES array contains information about the uploaded file, 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. The pathinfo() function returns an array containing information about the path of a file. You can use the PATHINFO_EXTENSION constant to get the file extension.

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

You can rename the file before uploading it to the server. This can be useful to avoid file name conflicts and to make the file name more meaningful. You can use the 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

you need to move the uploaded file to the server. You can use the move_uploaded_file() function to move the file. The move_uploaded_file() function takes two parameters: the temporary file name and the new file name.

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

Finally, you can display the file information to the user after the file has been uploaded. Here is an example view file that you can use:

<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>

In this view file, you simply display the file name, file type, and file extension using the variables that you retrieved in the controller method.

Once you have retrieved the file name, file type, and extension, you can use this information to validate the file before uploading it to the server. For example, you can check if the file type is allowed, or if the file size is within the acceptable range.

Conclusion

In conclusion, retrieving file information in CodeIgniter is a straightforward process that involves creating a form to upload files, a controller method to handle the file upload, and a view file to display the file information to the user. With this knowledge, you can easily add file upload functionality to your CodeIgniter applications.

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