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<?php var_dump(array_merge((array) array(5), (array) '7', (array) range(1,3))); var_dump(array() + array() + range(1,3));
Output for 4.3.0 - 7.2.0
array(5) { [0]=> int(5) [1]=> string(1) "7" [2]=> int(1) [3]=> int(2) [4]=> int(3) } array(3) { [0]=> int(1) [1]=> int(2) [2]=> int(3) }