3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = []; print $a ?? 'b1'; print "\n"; print $a ?: 'b2'; print "\n"; print $c ?? 'a1'; print "\n"; print $c ?: 'a2'; print "\n";
Output for 8.0.0 - 8.0.20, 8.1.0 - 8.1.7
Warning: Array to string conversion in /in/iCCa0 on line 5 Array b2 a1 Warning: Undefined variable $c in /in/iCCa0 on line 14 a2
Output for 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.30
Notice: Array to string conversion in /in/iCCa0 on line 5 Array b2 a1 Notice: Undefined variable: c in /in/iCCa0 on line 14 a2

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58.48 ms | 411 KiB | 5 Q