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run code in 150+ php & hhvm versions
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<?php $prodObj['test'] = true; $prodObj['sample'] = 5; $test = array_merge($prodObj); print $test; ?>
Output for 5.4.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
Notice: Array to string conversion in /in/KnoL1 on line 5 Array
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.3.0 - 5.3.29
Array