需求：
有两个多维数组
$arr = [ [‘name‘=>‘dee‘,‘age‘=>28], [‘name‘=>‘emperor‘, ‘age‘=>30], [‘name‘=>‘Lee‘, ‘age‘=>32], [‘name‘=>‘Arshavin‘, ‘age‘=>33] ]; $arr2 = [ [‘name‘=>‘Ozil‘, ‘age‘=>27], [‘name‘=>‘CR7‘, ‘age‘=>29], [‘name‘=>‘Doctor‘, ‘age‘=>33], [‘name‘=>‘John‘, ‘age‘=>35] ];
需要将两个数组合并，并且根据 ‘age‘ 从小到大进行排序，也就是最终的数组是：
Array( [0] => Array([name] => Ozil [age] => 27) [1] => Array([name] => dee [age] => 28) [2] => Array([name] => CR7 [age] => 29) [3] => Array([name] => emperor [age] => 30) [4] => Array([name] => Lee [age] => 32) [5] => Array([name] => Arshavin [age] => 33) [6] => Array([name] => Doctor [age] => 33) [7] => Array([name] => John [age] => 35)
[8] => Array([name] => Totti [age] => 40)
)
有几种思路：
1. 利用 sort() 函数对年龄进行排序
<?php
$arr = [
[‘name‘=>‘dee‘,‘age‘=>28],
[‘name‘=>‘emperor‘, ‘age‘=>30],
[‘name‘=>‘Lee‘, ‘age‘=>32],
[‘name‘=>‘Arshavin‘, ‘age‘=>33],
[‘name‘=>‘Totti‘, ‘age‘=>40]
];
$arr2 = [
[‘name‘=>‘Ozil‘, ‘age‘=>27],
[‘name‘=>‘CR7‘, ‘age‘=>29],
[‘name‘=>‘Doctor‘, ‘age‘=>33],
[‘name‘=>‘John‘, ‘age‘=>35]
];
echo ‘<pre>‘;
$tmp = array_merge($arr, $arr2);
$age = [];
foreach($tmp as $key => $val) {
$age[] = $val[‘age‘];
}
sort($age);
$new = [];
foreach($age as $key => $val) {
foreach($tmp as $k => $v) {
if($val == $v[‘age‘]) {
$new[$key] = $v;
unset($tmp[$k]);
}
}
}
print_r($new);
2. 使用冒泡排序代替 sort() 函数（冒泡排序比 sort() 函数更高效）
<?php
$arr = [
[‘name‘=>‘dee‘,‘age‘=>28],
[‘name‘=>‘emperor‘, ‘age‘=>30],
[‘name‘=>‘Lee‘, ‘age‘=>32],
[‘name‘=>‘Arshavin‘, ‘age‘=>33],
[‘name‘=>‘Totti‘, ‘age‘=>40]
];
$arr2 = [
[‘name‘=>‘Ozil‘, ‘age‘=>27],
[‘name‘=>‘CR7‘, ‘age‘=>29],
[‘name‘=>‘Doctor‘, ‘age‘=>33],
[‘name‘=>‘John‘, ‘age‘=>35]
];
echo ‘<pre>‘;
$tmp = array_merge($arr, $arr2);
$age = [];
foreach($tmp as $key => $val) {
$age[] = $val[‘age‘];
}
//冒泡排序
for($i = 0; $i < count($age) - 1; $i++) {
for($j = 0; $j < count($age) - $i - 1; $j++) {
if($age[$j] > $age[$j+1]) {
$t = $age[$j];
$age[$j] = $age[$j+1];
$age[$j+1] = $t;
}
}
}
$new = [];
foreach($age as $key => $val) {
foreach($tmp as $k => $v) {
if($val == $v[‘age‘]) {
$new[$key] = $v;
unset($tmp[$k]);
}
}
}
print_r($new);
3. 稍复杂
<?php
$arr = [
[‘name‘=>‘dee‘,‘age‘=>28],
[‘name‘=>‘emperor‘, ‘age‘=>30],
[‘name‘=>‘Lee‘, ‘age‘=>32],
[‘name‘=>‘Arshavin‘, ‘age‘=>33],
[‘name‘=>‘Totti‘, ‘age‘=>40]
];
$arr2 = [
[‘name‘=>‘Ozil‘, ‘age‘=>27],
[‘name‘=>‘CR7‘, ‘age‘=>29],
[‘name‘=>‘Doctor‘, ‘age‘=>33],
[‘name‘=>‘John‘, ‘age‘=>35]
];
echo ‘<pre>‘;
$tmp = [];
foreach($arr as $key => $val) {
foreach($arr2 as $k => $v) {
if($key == $k && 0 == $key) {
if($v[‘age‘] < $val[‘age‘]) {
$tmp[] = $v;
unset($arr2[0]);
} elseif ($v[‘age‘] > $val[‘age‘]) {
$tmp[] = $val;
unset($arr[0]);
} else {
$tmp[] = $val;
$tmp[] = $v;
unset($arr[0]);
unset($arr2[0]);
}
} else {
if($v[‘age‘] < $val[‘age‘]) {
$tmp[] = $v;
unset($arr2[$k]);
if(empty($arr2)) {
$tmp = array_merge($tmp, $arr);
}
} elseif($v[‘age‘] > $val[‘age‘]) {
$tmp[] = $val;
unset($arr[$key]);
if(empty($arr)) {
$tmp = array_merge($tmp, $arr2);
}
break;
} else {
$tmp[] = $val;
$tmp[] = $v;
unset($arr2[$k]);
unset($arr[$key]);
if(empty($arr)) {
$tmp = array_merge($tmp, $arr2);
}
break;
}
}
}
}
print_r($tmp);
4. 把年龄作为索引，使用 ksort() 函数进行排序。缺点：如果遇到了相同的年龄，则只能保留一组键值
<?php
$arr = [
[‘name‘=>‘dee‘,‘age‘=>28],
[‘name‘=>‘emperor‘, ‘age‘=>30],
[‘name‘=>‘Lee‘, ‘age‘=>32],
[‘name‘=>‘Arshavin‘, ‘age‘=>33],
[‘name‘=>‘Totti‘, ‘age‘=>40]
];
$arr2 = [
[‘name‘=>‘Ozil‘, ‘age‘=>27],
[‘name‘=>‘CR7‘, ‘age‘=>29],
[‘name‘=>‘Doctor‘, ‘age‘=>33],
[‘name‘=>‘John‘, ‘age‘=>35]
];
echo ‘<pre>‘;
foreach($arr as $key => $val) {
$arr[$val[‘age‘]] = $val;
unset($arr[$key]);
}
foreach($arr2 as $key => $val) {
$arr2[$val[‘age‘]] = $val;
unset($arr2[$key]);
}
$new = $arr + $arr2; //遇到相同的索引时，只会保留第一个数组中重复的键值
ksort($new);
$new = array_values($new);
print_r($new);
/*
说明：结果集中没有 $arr2 中索引为"Doctor"的键值
Array
(
[0] => Array
(
[name] => Ozil
[age] => 27
)
[1] => Array
(
[name] => dee
[age] => 28
)
[2] => Array
(
[name] => CR7
[age] => 29
)
[3] => Array
(
[name] => emperor
[age] => 30
)
[4] => Array
(
[name] => Lee
[age] => 32
)
[5] => Array
(
[name] => Arshavin
[age] => 33
)
[6] => Array
(
[name] => John
[age] => 35
)
[7] => Array
(
[name] => Totti
[age] => 40
)
)
原文：http://www.cnblogs.com/dee0912/p/5370033.html