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run code in 150+ php & hhvm versions
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<?php function bam () { $bum = null; return $bum; } $blam = bam(); if (!isset($blam)) { print 'blaop'; } else { print 'bloop'; }
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
blaop