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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, 5); print_r($test); ?>
Output for 5.0.0 - 5.6.28, 7.0.0 - 7.1.0
Warning: array_merge(): Argument #2 is not an array in /in/HUdbP on line 4
Output for hhvm-3.12.0
Warning: Invalid operand type was used: expects array(s) in /in/HUdbP on line 4
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.3.0 - 4.4.9
Array ( [test] => 1 [sample] => 5 [0] => 5 )