3v4l.org

run code in 300+ PHP versions simultaneously
<?php function fn (&$var){ $var = $var-($var/10*5); return $var; } echo fn(100);
Output for 5.3.0 - 5.3.27, 5.4.0 - 5.4.21
Fatal error: Only variables can be passed by reference in /in/UPm9H on line 11
Process exited with code 255.

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185.98 ms | 1395 KiB | 57 Q