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<?php
//有一個多維數(shù)組
$a = array(
  array('key1'=>940, 'key2'=>'blah'),
  array('key1'=>23, 'key2'=>'this'),
  array('key1'=>894, 'key2'=>'that')
);
//那么怎么對key1或者key2進(jìn)行排序呢,這里就需要使用到usort($arr, 'myfunction')函數(shù)了，它的作用是對$arr使用我們自定義的方法進(jìn)行排序，具體使用方法可以查看手冊
//1.對key1的值進(jìn)行排序
function asc_key1_sort($x, $y) {
  //可以輸出一下看看是怎么比較的
  echo 'Iteration:'.$x['key1'].' vs '.$y['key1'];
  if($x['key1'] > $y['key1']) {
    echo 'true<br/>';
    return true;
  }elseif($x['key1'] < $y['key1']) {
    echo 'false<br/>';
    return false;
  }else {
    echo '0';
    return 0;
  }
}
//進(jìn)行排序
usort($a, 'asc_key1_sort');
var_dump($a);
//2.對key2字符進(jìn)行排序
function asc_key2_sort($x, $y) {
  //可以使用strcasecmp()函數(shù)進(jìn)行排序
  echo 'Iteration:'.$x['key2'].' vs '.$y['key2'].'<br/>';
  return strcasecmp($x['key2'], $y['key2']);
}
//進(jìn)行排序
usort($a, 'asc_key2_sort');
var_dump($a);
?>

Iteration:23 vs 940false
Iteration:894 vs 23true
Iteration:940 vs 23true
Iteration:894 vs 940false
array(3) { [0]=> array(2) { ["key1"]=> int(23) ["key2"]=> string(4) "this" } [1]=> array(2) { ["key1"]=> int(894) ["key2"]=> string(4) "that" } [2]=> array(2) { ["key1"]=> int(940) ["key2"]=> string(4) "blah" } } Iteration:that vs this
Iteration:blah vs that
array(3) { [0]=> array(2) { ["key1"]=> int(940) ["key2"]=> string(4) "blah" } [1]=> array(2) { ["key1"]=> int(894) ["key2"]=> string(4) "that" } [2]=> array(2) { ["key1"]=> int(23) ["key2"]=> string(4) "this" } } 

<?php
//有一個多維數(shù)組
$a = array(
  123 => array('key1'=>940, 'key2'=>'blah'),
  349 => array('key1'=>23, 'key2'=>'this'),
  43 => array('key1'=>894, 'key2'=>'that')
);
//那么怎么對key1或者key2進(jìn)行排序呢,這里就需要使用到usort($arr, 'myfunction')函數(shù)了，它的作用是對$arr使用我們自定義的方法進(jìn)行排序，具體使用方法可以查看手冊
//1.對key1的值進(jìn)行排序
function asc_key1_sort($x, $y) {
  //可以輸出一下看看是怎么比較的
  echo 'Iteration:'.$x['key1'].' vs '.$y['key1'];
  if($x['key1'] > $y['key1']) {
    echo 'true<br/>';
    return true;
  }elseif($x['key1'] < $y['key1']) {
    echo 'false<br/>';
    return false;
  }else {
    echo '0';
    return 0;
  }
}
//進(jìn)行排序
usort($a, 'asc_key1_sort');
var_dump($a);
//2.對key2字符進(jìn)行排序
function asc_key2_sort($x, $y) {
  //可以使用strcasecmp()函數(shù)進(jìn)行排序
  echo 'Iteration:'.$x['key2'].' vs '.$y['key2'].'<br/>';
  return strcasecmp($x['key2'], $y['key2']);
}
//進(jìn)行排序
usort($a, 'asc_key2_sort');
var_dump($a);
?>

Iteration:23 vs 940false
Iteration:894 vs 23true
Iteration:940 vs 23true
Iteration:894 vs 940false
array(3) { [0]=> array(2) { ["key1"]=> int(23) ["key2"]=> string(4) "this" } [1]=> array(2) { ["key1"]=> int(894) ["key2"]=> string(4) "that" } [2]=> array(2) { ["key1"]=> int(940) ["key2"]=> string(4) "blah" } } Iteration:that vs this
Iteration:blah vs that
array(3) { [0]=> array(2) { ["key1"]=> int(940) ["key2"]=> string(4) "blah" } [1]=> array(2) { ["key1"]=> int(894) ["key2"]=> string(4) "that" } [2]=> array(2) { ["key1"]=> int(23) ["key2"]=> string(4) "this" } }