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run code in 150+ php & hhvm versions
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<?php $a = array( 'a' => 1, 'b' => 2 ); var_dump($a['h']); var_dump($a['h'] ? 'true' : 'false');
Output for 5.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
Notice: Undefined index: h in /in/HqtgW on line 8 NULL Notice: Undefined index: h in /in/HqtgW on line 9 string(5) "false"
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.3.0 - 5.2.17
Notice: Undefined index: h in /in/HqtgW on line 8 NULL Notice: Undefined index: h in /in/HqtgW on line 9 string(5) "false"