3v4l.org

run code in 300+ PHP versions simultaneously
<?php $foo; $bar; $baz; $var = 2; echo($foo ?? $bar ?? $baz ?? $var); echo((isset($foo)&&$foo!==null)?$foo:((isset($bar)&&$bar!==null)?$bar:((isset($baz)&&$baz!==null)?$baz:$var)));
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
22
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28
Parse error: syntax error, unexpected '?' in /in/2AZYo on line 6
Process exited with code 255.
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155.54 ms | 402 KiB | 213 Q