[PHP知识库]PHP二维数组根据子集某个字段排序

现有一个二维数据

$data = [
	['id' => 1, 'sort' => 8, 'name' => 'abc51', 'test' => 'test1'],
	['id' => 2, 'sort' => 3, 'name' => 'abc21', 'test' => 'test2'],
	['id' => 3, 'sort' => 44, 'name' => 'abc13', 'test' => 'test3'],
	['id' => 4, 'sort' => 1, 'name' => 'abc14', 'test' => 'test4'],
	['id' => 5, 'sort' => 4, 'name' => 'abc45', 'test' => 'test5'],
];

1.根据单条数据的id升序

$sort = array();
foreach ($data as $key => $row) {
	$sort[$key] = $row['id'];
}
array_multisort($sort, SORT_ASC, $data);
var_export($data);

结果

array (
  0 => 
  array (
    'id' => 1,
    'sort' => 8,
    'name' => 'abc51',
    'test' => 'test1',
  ),
  1 => 
  array (
    'id' => 2,
    'sort' => 3,
    'name' => 'abc21',
    'test' => 'test2',
  ),
  2 => 
  array (
    'id' => 3,
    'sort' => 44,
    'name' => 'abc13',
    'test' => 'test3',
  ),
  3 => 
  array (
    'id' => 4,
    'sort' => 1,
    'name' => 'abc14',
    'test' => 'test4',
  ),
  4 => 
  array (
    'id' => 5,
    'sort' => 4,
    'name' => 'abc45',
    'test' => 'test5',
  ),
)

2.根据name降序

$sort = array();
foreach ($data as $key => $row) {
	$sort[$key] = $row['name'];
}
array_multisort($sort, SORT_DESC, $data);
var_export($data);

结果

array (
  0 => 
  array (
    'id' => 2,
    'sort' => 3,
    'name' => 'adc21',
    'test' => 'test2',
  ),
  1 => 
  array (
    'id' => 1,
    'sort' => 8,
    'name' => 'abc51',
    'test' => 'test1',
  ),
  2 => 
  array (
    'id' => 5,
    'sort' => 4,
    'name' => 'abc45',
    'test' => 'test5',
  ),
  3 => 
  array (
    'id' => 4,
    'sort' => 1,
    'name' => 'abc14',
    'test' => 'test4',
  ),
  4 => 
  array (
    'id' => 3,
    'sort' => 44,
    'name' => 'abc13',
    'test' => 'test3',
  ),
)