<?php $venues = array( array( 'venue1' => 1, 'venue2' => 2, ), array( 'venue1' => 3, 'venue2' => 4, ), array ( 'venue1' => 2, 'venue2' => 1, ), array( 'venue1' => 5, 'venue2' => 6, ), ); $tmp = $venues; array_walk($tmp, static fn (array &$value) => sort($value)); $tmp = array_unique($tmp, SORT_REGULAR); $result = array_intersect_key($venues, $tmp); var_export($result);
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