run code in 200+ PHP versions simultaneously
<?php var_dump(mime_content_type('data://application/octet-stream;base64,'));

Shows result from various feature-branches currently under review from the php developers. Contact me to have additional branches featured.

Output for branch php-master
string(19) "application/x-empty"
Output for branch php-master+opcache
string(19) "application/x-empty"

Archived branches

Once feature-branches are merged or declined, they are no longer available. Their functionality (when merged) can be viewed from the main output page