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run code in 150+ php & hhvm versions
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<?php $foo = array('a' => 1, 'b' => 2); $bar = array('c' => 3, 'd' => 4); array_push($foo, $bar); var_dump($foo);
based on ZP6tE
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(3) { ["a"]=> int(1) ["b"]=> int(2) [0]=> array(2) { ["c"]=> int(3) ["d"]=> int(4) } }