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run code in 200+ php & hhvm versions
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<?php error_reporting(-1); $hello = $a['hello'] ?? $b['hi'] ?? $c['hello'] ?? null; print_r($hello);
based on nI2Vn
Output for 7.0.0 - 7.2.0
Output for 5.3.18 - 5.6.28
Parse error: syntax error, unexpected '?' in /in/XrWCQ on line 4
Process exited with code 255.