What additional security measures can be implemented alongside PHP file upload verification to enhance security?

When verifying file uploads in PHP, it's essential to implement additional security measures to prevent potential vulnerabilities such as file inclusion attacks or malicious file execution. One way to enhance security is by restricting the file types that can be uploaded, enforcing file size limits, and storing uploaded files in a secure directory outside the web root. 

// Additional security measures for file upload verification
$allowed_file_types = array('jpg', 'jpeg', 'png', 'gif');
$max_file_size = 1048576; // 1MB

if ($_FILES['file']['error'] === UPLOAD_ERR_OK) {
    $file_extension = pathinfo($_FILES['file']['name'], PATHINFO_EXTENSION);
    
    if (!in_array($file_extension, $allowed_file_types)) {
        die('Error: Invalid file type.');
    }

    if ($_FILES['file']['size'] > $max_file_size) {
        die('Error: File size exceeds limit.');
    }

    $upload_dir = 'uploads/';
    $upload_path = $upload_dir . basename($_FILES['file']['name']);

    if (move_uploaded_file($_FILES['file']['tmp_name'], $upload_path)) {
        echo 'File uploaded successfully.';
    } else {
        echo 'Error uploading file.';
    }
} else {
    die('Error uploading file.');
}

Keywords

file upload security measures PHP verification libraries

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