php 基础问题二维数组求和 ! 二维数组php求和 解决方案 » 免费领取超大流量手机卡,每月29元包185G流量+100分钟通话, 中国电信官方发货 $a = array( array("a" => "aa", "a1" => 1, "a2" => 1), array("a" => "bb", "a1" => 2, "a2" => 2), array("a" => "cc", "a1" => 3, "a2" => 3), array("a" => "aa", "a1" => 1, "a2" => 1), array("a" => "bb", "a1" => 5, "a2" => 5),);$res = array();foreach($a as $r) { if(! isset($res[$r['a']])) $res[$r['a']] = $r; else { $res[$r['a']]['a1'] += $r['a1']; $res[$r['a']]['a2'] += $r['a2']; }}print_r(array_values($res));Array( [0] => Array ( [a] => aa [a1] => 2 [a2] => 2 ) [1] => Array ( [a] => bb [a1] => 7 [a2] => 7 ) [2] => Array ( [a] => cc [a1] => 3 [a2] => 3 )) 用随机数替换文章中的多个网址,要求每个网址后面的随机数都不同 如何用在a.php指定的id,在b.php的相关id更改相关资料? 问一个格式化日期的问题 请问这是什么代码? 站内搜索的bug php如何发送引用页? 点击mysql->show me 时,在弹出窗口中的myodbc中显示"not found",这是否正常? 一般商业网站提供的并发数的意思是多少时间内的?感觉自己好像被骗了 请各位帮忙,为什么会这样啊? php的图库添加问题? PHP网站安装后根目录有3个文件夹,分别是install、statics、system。php大牛能详细介绍下这3个文件夹作用 编码风格转换
array("a" => "aa", "a1" => 1, "a2" => 1),
array("a" => "bb", "a1" => 2, "a2" => 2),
array("a" => "cc", "a1" => 3, "a2" => 3),
array("a" => "aa", "a1" => 1, "a2" => 1),
array("a" => "bb", "a1" => 5, "a2" => 5),
);
$res = array();
foreach($a as $r) {
if(! isset($res[$r['a']])) $res[$r['a']] = $r;
else {
$res[$r['a']]['a1'] += $r['a1'];
$res[$r['a']]['a2'] += $r['a2'];
}
}
print_r(array_values($res));Array
(
[0] => Array
(
[a] => aa
[a1] => 2
[a2] => 2
) [1] => Array
(
[a] => bb
[a1] => 7
[a2] => 7
) [2] => Array
(
[a] => cc
[a1] => 3
[a2] => 3
))