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run code in 150+ php & hhvm versions
Bugs & Features
<?php $heightOptions = array(0,100,314); $heightKey = rand(1,3); $initialHeight = $heightOptions[$heightKey]; print (@heightKey); ?>
Output for 4.3.6 - 4.3.8, 4.3.11, 4.4.1 - 4.4.9, 5.0.1 - 5.0.3, 5.1.0 - 5.1.1, 5.1.3 - 5.1.4, 5.1.6, 5.2.1, 5.2.3, 5.2.5 - 5.2.8, 5.2.10, 5.2.13 - 5.2.14, 5.2.16 - 5.3.0, 5.3.2 - 5.3.7, 5.3.10 - 5.3.13, 5.3.15, 5.3.17, 5.3.19 - 5.3.20, 5.3.22, 5.3.24 - 5.3.25, 5.3.27 - 5.4.3, 5.4.6, 5.4.8 - 5.4.9, 5.4.13, 5.4.15, 5.4.17 - 5.4.22, 5.4.26 - 5.4.36, 5.4.38 - 5.4.39, 5.4.41 - 5.4.44, 5.5.25 - 5.5.27, 5.5.30 - 5.5.34, 5.6.7 - 5.6.9, 5.6.11 - 5.6.14, 5.6.16, 5.6.18 - 5.6.19, 5.6.21, hhvm-3.12.0, 7.0.0, 7.0.5, 7.0.12 - 7.1.0
heightKey
Output for 5.3.1, 5.3.8 - 5.3.9, 5.3.14, 5.3.16, 5.3.18, 5.3.21, 5.3.23, 5.3.26, 5.4.4 - 5.4.5, 5.4.7, 5.4.10 - 5.4.12, 5.4.14, 5.4.16, 5.4.23 - 5.4.25, 5.4.37, 5.4.40, 5.4.45 - 5.5.24, 5.5.28 - 5.5.29, 5.5.35, 5.6.10, 5.6.15, 5.6.17, 5.6.20, 5.6.28, 7.0.1 - 7.0.4, 7.0.6
Notice: Undefined offset: 3 in /in/gYQEl on line 4 heightKey
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.3.0 - 4.3.5, 4.3.9 - 4.3.10, 4.4.0, 5.0.0, 5.0.4 - 5.0.5, 5.1.2, 5.1.5, 5.2.0, 5.2.2, 5.2.4, 5.2.9, 5.2.11 - 5.2.12, 5.2.15
Notice: Undefined offset: 3 in /in/gYQEl on line 4 heightKey