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run code in 200+ php & hhvm versions
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<?php $a = array('b' => 0); var_dump(is_set($a['b'])); ?>
based on 64Jsg
Output for 7.0.0 - 7.2.0
Fatal error: Uncaught Error: Call to undefined function is_set() in /in/J9rtI:4 Stack trace: #0 {main} thrown in /in/J9rtI on line 4
Process exited with code 255.
Output for 5.3.22 - 5.6.28
Fatal error: Call to undefined function is_set() in /in/J9rtI on line 4
Process exited with code 255.