What are the best practices for ensuring proper file upload functionality in PHP without relying on register_globals being turned on?

When register_globals is turned off in PHP, it is important to use superglobal arrays like $_FILES to handle file uploads safely. To ensure proper file upload functionality without relying on register_globals, always validate file uploads, check for errors, move uploaded files to a secure location, and set appropriate permissions. 

<?php
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    if (isset($_FILES['file'])) {
        $file = $_FILES['file'];

        if ($file['error'] === UPLOAD_ERR_OK) {
            $uploadDir = 'uploads/';
            $uploadFile = $uploadDir . basename($file['name']);

            if (move_uploaded_file($file['tmp_name'], $uploadFile)) {
                echo "File uploaded successfully.";
            } else {
                echo "Error uploading file.";
            }
        } else {
            echo "Error: " . $file['error'];
        }
    } else {
        echo "No file uploaded.";
    }
}
?>

Keywords

file upload PHP register_globals security validation

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