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<?php $a = [ ]; $b = [ ['x', 'y'], ['z', '0'] ]; var_dump([...$a, ...$b]);
Output for git.master_jit, git.master
array(2) { [0]=> array(2) { [0]=> string(1) "x" [1]=> string(1) "y" } [1]=> array(2) { [0]=> string(1) "z" [1]=> string(1) "0" } }

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