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run code in 200+ php & hhvm versions
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<?php var_dump( $a ?? $b ?? $c ?? $d ?? $e ?? 'foo' );
Output for 7.0.0 - 7.2.0
string(3) "foo"
Output for 5.3.20 - 5.6.28
Parse error: syntax error, unexpected '?' in /in/ChTEF on line 5
Process exited with code 255.