php 基础问题二维数组求和 !
数组：
$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))
第一个键值相同的元素 求和
结果
$r = array(array(a=>aa,a1=>2,a2=>2),array(a=>bb,a1=>7,a2=>7),array(a=>cc,a1=>3,a2=>3));
------解决方案--------------------
$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
)
)
http://www.bkjia.com/phpjc/820411.htmlwww.bkjia.comtruehttp://www.bkjia.com/phpjc/820411.htmltecharticlephp 基础问题二维数组求和 ! 数组： $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)) 第一个键...