1 $infos = array(
2 array(
3 'a' => 36,
4 'b' => 'xa',
5 'c' => '2015-08-28 00:00:00',
6 'd' => '2015/08/438488a00b3219929282e3652061c2e3.png'
7 ),
8 array(
9 'a' => 3,
10 'b' => 'vd',
11 'c' => '2015-08-20 00:00:00',
12 'd' => '2015/08/438488a00b3219929282e3652061c2e3.png'
13 ),
14 array(
15 'a' => 6,
16 'b' => 'wwe',
17 'c' => '2015-08-28 00:00:00',
18 'd' => '2015/08/438488a00b3219929282e3652061c2e3.png'
19 ),
20 array(
21 'a' => 36,
22 'b' => 'se',
23 'c' => '2015-08-28 00:00:00',
24 'd' => '2015/08/438488a00b3219929282e3652061c2e3.png'
25 ),
26 array(
27 'a' => 6,
28 'b' => 'aw',
29 'c' => '2015-08-28 00:00:00',
30 'd' => '2015/08/438488a00b3219929282e3652061c2e3.png'
31 ),
32 array(
33 'a' => 36,
34 'b' => 'bv',
35 'c' => '2015-08-28 00:00:00',
36 'd' => '2015/08/438488a00b3219929282e3652061c2e3.png'
37 ),
38 array(
39 'a' => 12,
40 'b' => 'xx',
41 'c' => '2015-08-27 00:00:00',
42 'd' => '2015/08/438488a00b3219929282e3652061c2e3.png'
43 )
44 );
处理要求：将数组中a相同的二维数组合并到一个数组中，生成一个新的数组
1 <?php
2 $result= array();
3 foreach ($infos as $key => $info) {
4 $result[$info['a']][] = $info;
5 }
6 print_r($result);
Array
(
[36] => Array
(
[0] => Array
(
[a] => 36
[b] => xa
[c] => 2015-08-28 00:00:00
[d] => 2015/08/438488a00b3219929282e3652061c2e3.png
)
[1] => Array
(
[a] => 36
[b] => se
[c] => 2015-08-28 00:00:00
[d] => 2015/08/438488a00b3219929282e3652061c2e3.png
)
[2] => Array
(
[a] => 36
[b] => bv
[c] => 2015-08-28 00:00:00
[d] => 2015/08/438488a00b3219929282e3652061c2e3.png
)
)
[3] => Array
(
[0] => Array
(
[a] => 3
[b] => vd
[c] => 2015-08-20 00:00:00
[d] => 2015/08/438488a00b3219929282e3652061c2e3.png
)
)
[6] => Array
(
[0] => Array
(
[a] => 6
[b] => wwe
[c] => 2015-08-28 00:00:00
[d] => 2015/08/438488a00b3219929282e3652061c2e3.png
)
[1] => Array
(
[a] => 6
[b] => aw
[c] => 2015-08-28 00:00:00
[d] => 2015/08/438488a00b3219929282e3652061c2e3.png
)
)
[12] => Array
(
[0] => Array
(
[a] => 12
[b] => xx
[c] => 2015-08-27 00:00:00
[d] => 2015/08/438488a00b3219929282e3652061c2e3.png
)
)
)
