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<?php $data = [[2,1], [1,2], [1,2], [2,1], [2,3], [3,2], [4,5]]; array_walk($data, 'sort'); $data = array_unique($data, SORT_REGULAR); var_dump($data);
Output for git.master, git.master_jit, rfc.property-hooks
array(3) { [0]=> array(2) { [0]=> int(1) [1]=> int(2) } [4]=> array(2) { [0]=> int(2) [1]=> int(3) } [6]=> array(2) { [0]=> int(4) [1]=> int(5) } }

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