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<?php $a1=array("red","green"); $a2=array("blue","yellow"); print_r(array_merge($a1,$a2)); ?>
Output for 4.3.0 - 5.6.30, hhvm-3.10.1 - 3.22.0, 7.0.0 - 7.2.10
Array ( [0] => red [1] => green [2] => blue [3] => yellow )