<?php $X = array('a' => 'a in X', 'ab' => 'ab in X', 'na' => null, 'nb' => 'nb in X'); $Y = array('b' => 'b in Y', 'ab' => 'ab in Y', 'na' => 'na in X', 'nb' => null); $XY = array_merge($X, $Y); var_dump($XY);
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