3v4l.org

run code in 200+ php & hhvm versions
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<?php $a = true; $return = $a == true ?? "Success"; echo $return;
based on eopoD
Output for 7.0.0 - 7.2.0
1
Output for 5.3.18 - 5.6.28
Parse error: syntax error, unexpected '?' in /in/bZJmm on line 3
Process exited with code 255.