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<?php $array = [[2,48],[48,2],[19,31],[31,19]]; $result = []; foreach ($array as $row) { sort($row); $result[json_encode($row)] ??= $row; } var_export(array_values($result));
Output for git.master, git.master_jit, rfc.property-hooks
array ( 0 => array ( 0 => 2, 1 => 48, ), 1 => array ( 0 => 19, 1 => 31, ), )

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