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run code in 150+ php & hhvm versions
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<?php $fieldvalue[0] = false; if(isset($fieldvalue[0]) and $fieldvalue[0] === false) { echo 'false is true'; }
based on HvaKZ
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
false is true