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<?php $a = []; $b = array_merge([4 => 1], $a); var_dump($b); $a = []; $b = [4 => 1] + $a; var_dump($b);
Output for git.master_jit, git.master
array(1) { [0]=> int(1) } array(1) { [4]=> int(1) }

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