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run code in 150+ php & hhvm versions
Bugs & Features
<?php // given: unset($undef); $null = NULL; $false = FALSE; $true = TRUE; // these operations: var_dump(isset($var)); var_dump(empty($var)); var_dump(array_key_exists('var', $GLOBALS)); // "defined" below
Output for 4.3.0 - 5.0.5, 5.1.1 - 5.6.21, hhvm-3.12.0, 7.0.5 - 7.1.0
bool(false) bool(true) bool(false)
Output for 7.0.0 - 7.0.4
bool(false) bool(true) bool(true)
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.1.0
Fatal error: fatal flex scanner internal error--end of buffer missed in /in/90GbJ on line 11
Process exited with code 255.