What are common reasons for an Internal Server Error 500 when uploading large files in PHP?

Common reasons for an Internal Server Error 500 when uploading large files in PHP can include server configuration limits on file size, memory limits, or execution time. To solve this issue, you can adjust these limits in your PHP configuration file (php.ini) or in your server configuration settings.

// Increase upload file size limit
ini_set('upload_max_filesize', '20M');
ini_set('post_max_size', '20M');

// Increase memory limit
ini_set('memory_limit', '128M');

// Increase max execution time
ini_set('max_execution_time', 300);