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<?php class SortMadness { private $data; public function __construct($data) { $this->data = $data; } public function __toString() { $data = array_merge($this->data); sort($data); $rs = implode('-', $data); echo $rs."\n"; return $rs; } } // expected result is ['c','b'],['c','b','a'] $a = array( new SortMadness(array('c','b')), new SortMadness(array('c','b','a')), new SortMadness(array('a','b','c')), ); $rs = array_unique($a, SORT_STRING); print_r($rs); /* usort($a, 'strcmp'); print_r($a); */

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45.74 ms | 402 KiB | 5 Q