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<?php $a = array ( 0 => array ('Hund', 'Katze'), 1 => array ('Hund', 'Katze', 'Pferd'), 2 => array ('Hund', 'Katze'), 3 => array ('Katze', 'Hund'), 4 => array (1=>'Hund', 2=>'Katze'), ); $b = array_unique($a, SORT_REGULAR); print_r($b);
Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
Array ( [0] => Array ( [0] => Hund [1] => Katze ) [1] => Array ( [0] => Hund [1] => Katze [2] => Pferd ) [3] => Array ( [0] => Katze [1] => Hund ) [4] => Array ( [1] => Hund [2] => Katze ) )

preferences:
212.56 ms | 404 KiB | 283 Q