3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = "hola"; call_user_func(function(){ echo $a; },&$a)
Output for 7.0.0 - 7.0.2
Parse error: syntax error, unexpected '&' in /in/5lbu5 on line 6
Process exited with code 255.
Output for 5.5.24 - 5.5.31, 5.6.8 - 5.6.17
Fatal error: Call-time pass-by-reference has been removed in /in/5lbu5 on line 6
Process exited with code 255.
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170.42 ms | 1395 KiB | 28 Q