Upload a File in CodeIgniter 4

Working with files in CodeIgniter is much simpler and more secure than PHP’s $_FILES.

In this example, I am going to show you how to upload a file using the CodeIgniter 4 framework PHP.

Here, we are using 2 files for uploading a file:

Controller: 	Document.php              app\Controllers\Document.php
View:		upload_file.php         app\Views\upload_file.php

$routes->add('document/', 'Document::upload_form');
$routes->post('document/upload', 'Document::upload');

<?php 
$attr = 'class="form-horizontal" id="add_client_form" autocomplete="off"';
echo form_open_multipart("document/upload", $attr);
?>

<div class="form-group">
	<label class="col-sm-2 control-label">File</label>
	<div class="col-md-4">
		<input type="file" id="file" name="file">
		<p class="help-block">Allowed types (.jpg, .png, .gif, .pdf)</p>
	</div>
	<div class="col-md-6"></div>
</div>

<?php 
namespace App\Controllers;

use App\Controllers\BaseController;

class Document extends BaseController {

    public function __construct() {
    
		helper(['url', 'form', 'array']);
    
    }
    
    public function upload_form() {
        echo view("upload_file");
    }
    
    public function upload() {
        $path 				= 'uploads/';
        $file 			    = $this->request->getFile('file');
        $upload_file 	    = $this->uploadFile($path, $file);
        
        if($upload_file)
            echo "File uploaded successfully @ ".$upload_file;
    }
    
    public function uploadFile($path, $image) {
		if ($image->isValid() && ! $image->hasMoved()) {
			$newName = $image->getRandomName();
			$image->move('./'.$path, $newName);
			return $path.$image->getName();
		}
		return "";
	}

}