<?php
/**
 * =======================================
 * Created by Zhihua_W.
 * Author: Zhihua_W
 * Date: 2016/11/26 0002
 * Time: 下午 2:43
 * Project: PHP开发小技巧
 * Power: 实现二维数组根据key进行排序
 * =======================================
 */
/**
 * 二维数组排序
 * @param array $arr 需要排序的二维数组
 * @param string $keys 所根据排序的key
 * @param string $type 排序类型，desc、asc
 * @return array $new_array 排好序的结果
 */
function array_sort($arr, $keys, $type = 'desc')
{
  $key_value = $new_array = array();
  foreach ($arr as $k => $v) {
    $key_value[$k] = $v[$keys];
  }
  if ($type == 'asc') {
    asort($key_value);
  } else {
    arsort($key_value);
  }
  reset($key_value);
  foreach ($key_value as $k => $v) {
    $new_array[$k] = $arr[$k];
  }
  return $new_array;
}
$arr = array(
  array(
    'name' => 'a',
    'sex' => 'm',
    'sort' => 5
  ),
  array(
    'name' => 'c',
    'sex' => 'm',
    'sort' => 8
  ),
  array(
    'name' => 'g',
    'sex' => 'm',
    'sort' => 3
  ),
  array(
    'name' => 'e',
    'sex' => 'w',
    'sort' => 6
  ),
  array(
    'name' => 'b',
    'sex' => 'w',
    'sort' => 2
  ),
);
//打印出原数组
print_r($arr);
//打印出排好序的数组
print_r(array_sort($arr,'name'));
?>

//原数组
Array
(
  [0] => Array
    (
      [name] => a
      [sex] => m
      [sort] => 5
    )
  [1] => Array
    (
      [name] => c
      [sex] => m
      [sort] => 8
    )
  [2] => Array
    (
      [name] => g
      [sex] => m
      [sort] => 3
    )
  [3] => Array
    (
      [name] => e
      [sex] => w
      [sort] => 6
    )
  [4] => Array
    (
      [name] => b
      [sex] => w
      [sort] => 2
    )
)
//排序后数组
Array
(
  [2] => Array
    (
      [name] => g
      [sex] => m
      [sort] => 3
    )
  [3] => Array
    (
      [name] => e
      [sex] => w
      [sort] => 6
    )
  [1] => Array
    (
      [name] => c
      [sex] => m
      [sort] => 8
    )
  [4] => Array
    (
      [name] => b
      [sex] => w
      [sort] => 2
    )
  [0] => Array
    (
      [name] => a
      [sex] => m
      [sort] => 5
    )
)