What potential security risks should be considered when implementing buttons to delete and download files in a PHP script?

When implementing buttons to delete and download files in a PHP script, it is important to consider potential security risks such as unauthorized access, file injection, and malicious file downloads. To mitigate these risks, always validate user input, sanitize file names to prevent directory traversal attacks, and restrict access to authorized users only. 

// Validate user input for file deletion
if(isset($_POST['delete_file'])){
    $fileToDelete = $_POST['delete_file'];

    // Sanitize file name to prevent directory traversal attacks
    $fileToDelete = basename($fileToDelete);

    // Check if user is authorized to delete the file
    if(userIsAuthorized()){
        // Delete the file
        unlink('path/to/files/' . $fileToDelete);
    } else {
        echo "Unauthorized access!";
    }
}

// Function to check if user is authorized to delete files
function userIsAuthorized(){
    // Implement your authorization logic here
    return true; // For demonstration purposes, always return true
}

Keywords

SQL injection Cross-site scripting File permissions CSRF protection Input validation

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