PHP排序数组() [英] PHP sort array()

问题描述

我有一个看起来像这样的数组:

I have an array which looks like:

array(
    'parent1' => array(
        name = 'somename',
        childs = array('child1', 'child2', 'child3', 'child4')
    ),
    'parent2' => array(
        name = 'somename',
        childs = array('child1')
    ),
    'parent3' => array(
        name = 'somename',
        childs = array('child1', 'child2', 'child3', 'child4', 'child5')
    )
    'parent4' => array(
        name = 'somename',
        childs = array('child1', 'child2', 'child3')
    ),
    'parent5' => array(
        name = 'somename',
        childs = array('child1', 'child2', 'child3', 'child4', 'child5', 'child6', 'child7')
    )
)

我该如何按孩子的孩子计数(升序)对父母进行排序?不应更改父母和孩子的名字.

Ho do I sort parents by its childs count (asc order)? Parents and childs names should not be changed.

推荐答案

尝试一下:

function count_sort($a, $b) {
  if (count($a) == count($b)) {
    return 0;
  }
  return (count($a) < count($b)) ? -1 : 1;
}

$test_array = array(
  'parent1' => array('child1', 'child2', 'child3', 'child4'),
  'parent2' => array('child1'),
  'parent3' => array('child1', 'child2', 'child3', 'child4', 'child5'),
  'parent4' => array('child1', 'child2', 'child3'),
  'parent5' => array('child1', 'child2', 'child3', 'child4', 'child5', 'child6', 'child7')
);

print_r($test_array);
usort($test_array, "count_sort");
print_r($test_array);

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