<?php print json_encode([ [...['a', 'b'], ...['c', 'd']], // [a, b, c, d] array_merge(['a', 'b'], ['c', 'd']), // [a, b, c, d] ['a', 'b'] + ['c', 'd'], // [a, b] array_replace(['a', 'b'], ['c', 'd']), // [c, d] ]);
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