php 數組排序問題

$arr = array(        'id' => 1, 'pid' => 0, 'title' => '1',        'id' => 2, 'pid' => 0, 'title' => '2',        'id' => 3, 'pid' => 0, 'title' => '3',        'id' => 4, 'pid' => 0, 'title' => '4',        'id' => 5, 'pid' => 1, 'title' => '1-5',        'id' => 6, 'pid' => 5, 'title' => '1-5-6',        'id' => 7, 'pid' => 1, 'title' => '1-7',        'id' => 8, 'pid' => 2, 'title' => '2-8',    );

排序完效果

$arr = array(        'id' => 1, 'pid' => 0, 'title' => '1',        'id' => 5, 'pid' => 1, 'title' => '1-5',        'id' => 6, 'pid' => 5, 'title' => '1-5-6',        'id' => 7, 'pid' => 1, 'title' => '1-7',        'id' => 2, 'pid' => 0, 'title' => '2',        'id' => 8, 'pid' => 2, 'title' => '2-8',        'id' => 3, 'pid' => 0, 'title' => '3',        'id' => 4, 'pid' => 0, 'title' => '4',    );

就是父節點後面緊跟子節點

回複內容：

$arr = array(        'id' => 1, 'pid' => 0, 'title' => '1',        'id' => 2, 'pid' => 0, 'title' => '2',        'id' => 3, 'pid' => 0, 'title' => '3',        'id' => 4, 'pid' => 0, 'title' => '4',        'id' => 5, 'pid' => 1, 'title' => '1-5',        'id' => 6, 'pid' => 5, 'title' => '1-5-6',        'id' => 7, 'pid' => 1, 'title' => '1-7',        'id' => 8, 'pid' => 2, 'title' => '2-8',    );

排序完效果

$arr = array(        'id' => 1, 'pid' => 0, 'title' => '1',        'id' => 5, 'pid' => 1, 'title' => '1-5',        'id' => 6, 'pid' => 5, 'title' => '1-5-6',        'id' => 7, 'pid' => 1, 'title' => '1-7',        'id' => 2, 'pid' => 0, 'title' => '2',        'id' => 8, 'pid' => 2, 'title' => '2-8',        'id' => 3, 'pid' => 0, 'title' => '3',        'id' => 4, 'pid' => 0, 'title' => '4',    );

就是父節點後面緊跟子節點

 1, 'pid' => 0, 'title' => '1'),        array('id' => 2, 'pid' => 0, 'title' => '2'),        array('id' => 3, 'pid' => 0, 'title' => '3'),        array('id' => 4, 'pid' => 0, 'title' => '4'),        array('id' => 5, 'pid' => 1, 'title' => '1-5'),        array('id' => 6, 'pid' => 5, 'title' => '1-5-6'),        array('id' => 7, 'pid' => 1, 'title' => '1-7'),        array('id' => 8, 'pid' => 2, 'title' => '2-8'),    );function userSort($a, $b) {    $a = $a['title'];    $b = $b['title'];    if($a == $b) return 0;    return $a>$b ? 1 : -1;}usort($arr, 'userSort');echo "
";print_r($arr);
