What are some best practices for creating an online video generator using PHP?

Creating an online video generator using PHP involves handling user input, generating video files, and serving them to users. Best practices include validating user input, using a secure file storage system, and optimizing video rendering for performance. 

// Sample code for creating a basic online video generator in PHP

// Validate user input
if(isset($_POST['text'])){
    $text = $_POST['text'];
    // Sanitize and validate input here
}

// Generate video file
$videoFile = 'output.mp4';
$command = "ffmpeg -i input.mp4 -vf drawtext=text='$text':fontfile=arial.ttf:fontsize=24:x=10:y=10:fontcolor=white -c:a copy $videoFile";
exec($command);

// Serve video file to user
header('Content-type: video/mp4');
header('Content-Disposition: attachment; filename="' . $videoFile . '"');
readfile($videoFile);

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