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run code in 200+ php & hhvm versions
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<?php var_dump(null ?: 'default'); var_dump('item' ?: 'default');
based on BFQES
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.2.0
string(7) "default" string(4) "item"