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<?php $b=array("sanjeev","kumar"); $c=array("sanjeev","kumar"); array_push($b,$c); var_dump($b); ?>
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(3) { [0]=> string(7) "sanjeev" [1]=> string(5) "kumar" [2]=> array(2) { [0]=> string(7) "sanjeev" [1]=> string(5) "kumar" } }