How to Solve File Upload Issues in PHP Using $_FILES?

File Uploading with PHP

This guide demonstrates how to upload files in PHP, addressing a common error encountered in previous approaches.

Problem:

When attempting to upload a file to a specified folder, an error arises due to the use of the deprecated HTTP_POST_FILES variable.

Solution:

The following PHP code provides a modernized and updated solution for file uploading:

$target_dir = "upload/";
$target_file = $target_dir . basename($_FILES["fileToUpload"]["name"]);
$imageFileType = strtolower(pathinfo($target_file, PATHINFO_EXTENSION));
$allowedTypes = ['jpg', 'png'];

if (isset($_POST["submit"])) {
    // Check file type
    if (!in_array($imageFileType, $allowedTypes)) {
        $msg = "Type is not allowed";
    }
    // Check if file already exists
    elseif (file_exists($target_file)) {
        $msg = "Sorry, file already exists.";
    }
    // Check file size
    elseif ($_FILES["fileToUpload"]["size"] > 5000000) {
        $msg = "Sorry, your file is too large.";
    }
    elseif (move_uploaded_file($_FILES["fileToUpload"]["tmp_name"], $target_file)) {
        $msg = "The file " . basename($_FILES["fileToUpload"]["name"]) . " has been uploaded.";
    }
}

Explanation:

• $_FILES["fileToUpload"] retrieves the file upload information.
• $target_dir specifies the destination folder.
• Conditional statements check file type, existence, and size.
• move_uploaded_file() moves the file to the specified location.
• The $msg variable stores messages based on the upload status.

HTML Code for Uploading:

<form action="upload.php" method="post">

Using this updated code, you can successfully upload files to your desired folder and handle validation errors appropriately.

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