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<?php $venues = array( array( 'venue1' => 1, 'venue2' => 2, ), array( 'venue1' => 3, 'venue2' => 4, ), array ( 'venue1' => 2, 'venue2' => 1, ), array( 'venue1' => 5, 'venue2' => 6, ), ); $result = $pairs = $venues; array_walk($pairs, static fn(array &$value) => sort($value)); var_export($pairs); foreach ($pairs as $k => $pair) { if (count(array_keys($pairs, $pair)) > 1) { unset($result[$k]); } } var_export($result);
Output for git.master, git.master_jit
array ( 0 => array ( 0 => 1, 1 => 2, ), 1 => array ( 0 => 3, 1 => 4, ), 2 => array ( 0 => 1, 1 => 2, ), 3 => array ( 0 => 5, 1 => 6, ), )array ( 1 => array ( 'venue1' => 3, 'venue2' => 4, ), 3 => array ( 'venue1' => 5, 'venue2' => 6, ), )

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