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SELECT * , ( 2 - SUM( zhongjiang ) / COUNT( user_id ) ) AS psort
FROM `zhongjiang`
WHERE 1
GROUP BY user_id
ORDER BY psort DESC
Sep 8, 2013
Replied to a topic by ovear PHP 关于PHP FOREACH的一个问题
第一个循环结束之后
foreach ($ww as &$v) {}

$v是指向$ww 最后一个值的引用

此时如果对 $v 赋值都会改变 $ww 最后一个元素的值
例如 :$v = 'someValue';
则:
$ww = Array
(
[0] => 123,
[1] => 456,
[2] => 'someValue'
)

第二个循环遍历逐个将 $qq 的元素赋值给 $v;
循环结束时刚好是 $v = $qq[2] = 3
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