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<?php $foo = 0; $bar = function() use (&$foo) { return ++ $foo; }; var_dump($bar() ?? $bar() ?? $bar(), $foo );
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
int(1) int(1)
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.21
Parse error: syntax error, unexpected '?' in /in/4qLPu on line 4
Process exited with code 255.

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