大神求助 急...
两个二维数组
$cart = arrray(array("id"=1,"num="2"));（session中的array值）
第一次传 $newcart = arrray(array("id"=1,"num="4");array("id"=2,"num="4"))
第二次传 $newcart = arrray(array("id"=9,"num="4");array("id"=1,"num="5"))
第三次传 id 是随时变的....
。。。。。
怎么样遍历 使它变成 $cart = arrray(
[0]=>array("id"=>1,"num"=>10)
[1]=>array("id"=>2,"num"=>4)
[2]=>array("id"=>9,"num"=>5)
)
怎么就实现 大神求助啊
------解决方案--------------------
没看懂，id为9 的num怎么变成5了。id=1 的也不知道怎么来的。
------解决方案--------------------
<br />
$cart = array(1=>array("id"=>1,"num"=>2),2=>array("id"=>2,"num"=>5));<br />
$newcart = array(1=>array("id"=>1,"num"=>4),3=>array("id"=>3,"num"=>4));<br />
foreach( $newcart as $k=>$v ){<br />
<br />
if( $cart[$v['id']] ){<br />
<br />
$cart[$v['id']]['num'] += $v['num']; <br />
<br />
}<br />
else{<br />
<br />
$cart = array_merge($cart,array($v));<br />
<br />
}<br />
<br />
}<br />
$cart = array(array("id"=>1,"num"=>2));<br />
<br />
$newcart = array(array("id"=>1,"num"=>4),array("id"=>2,"num"=>4));<br />
foreach($cart as $v) $t[$v['id']]+=$v['num'];<br />
<br />
foreach($newcart as &$v){<br />
$v['num']+=$t[$v['id']];<br />
}<br />
$cart =$newcart; <br />
print_r($cart);
