3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = "Foo"; $b = "Bar"; function testIt (&$b){ $b = "Yay!"; } testIt(&$a); testIt($b); print "$a\n"; print "$b\n";
Output for 5.4.0 - 5.4.30
Fatal error: Call-time pass-by-reference has been removed in /in/Becfb on line 8
Process exited with code 255.
Output for 5.3.0 - 5.3.29
Deprecated: Call-time pass-by-reference has been deprecated in /in/Becfb on line 8 Yay! Yay!
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205.03 ms | 1395 KiB | 68 Q