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run code in 300+ PHP versions simultaneously
<?php function gimmeFalse() : false { return false; } var_dump(gimmeFalse());

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

Output for branch master
Fatal error: False can not be used as a standalone type in /in/MqsvC on line 3
Process exited with code 255.

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