foreach 追加问题，求高手帮忙看看。
101010100,
朝阳=>101010300
);
foreach ($citycode as $arr => $value) {
$citycode[$arr] = http://weather.xxx.com/.substr($citycode[$arr], 3,4)..txt;
//$citycode[$arr] .= http://weather.xxx.com/.$citycode[$arr]..txt;
}
/*
 功能：按行保存为文件
*/
savefile('api/weather.txt',implode(\r\n,$citycode));
?>
我想根据数组保存为换行文件，如下：
http://weather.xxx.com/0101.txt
http://weather.xxx.com/101010100.txt
http://weather.xxx.com/0103.txt
http://weather.xxx.com/101010300.txt
要怎么做？
我现在只能做到：
http://weather.xxx.com/0101.txt
http://weather.xxx.com/0103.txt
怎么追加进去呢？
------解决思路----------------------
foreach ($citycode as $arr => $value) {
$citycode[$arr] = http://weather.xxx.com/.substr($citycode[$arr], 3,4)..txt;
//$citycode[$arr] .= http://weather.xxx.com/.$citycode[$arr]..txt;
}

你这样明显的用t同样的键值覆盖了之前的值嘛，要不就换个键值如
$citycode[$arr.'1'] = http://weather.xxx.com/.substr($citycode[$arr], 3,4)..txt;

------解决思路----------------------
101010100,
朝阳=>101010300
);
$tmp = array();
foreach ($citycode as $arr => $value) {
$tmp[] = http://weather.xxx.com/.substr($value, 3,4)..txt;
$tmp[] = http://weather.xxx.com/.$value..txt;
}
echo implode(\r\n, $tmp);
//savefile('api/weather.txt',implode(\r\n,$citycode));

http://weather.xxx.com/0101.txt
http://weather.xxx.com/101010100.txt
http://weather.xxx.com/0103.txt
http://weather.xxx.com/101010300.txt

楼主是想这样么？
------解决思路----------------------
$citycode[$arr] .= http://weather.xxx.com/.$citycode[$arr]..txt;
这里的$citycode[$arr] 已经被修改了
被上一句$citycode[$arr] = http://weather.xxx.com/.substr($citycode[$arr], 3,4)..txt;
另外：$citycode[$arr] .= http://weather.xxx.com/.$citycode[$arr]..txt;
使用拼接的话你忘记换行了。
改这样就可以了
$citycode = array(
北京=>101010100,
朝阳=>101010300
);
$result = array();
foreach ($citycode as $arr => $value) {
array_push($result,http://weather.xxx.com/.substr($value, 3,4)..txt);
array_push($result,http://weather.xxx.com/.$value..txt);
}
/*
功能：按行保存为文件
*/
savefile('api/weather.txt',implode(\r\n,$result));

http://weather.xxx.com/0101.txt
http://weather.xxx.com/101010100.txt
http://weather.xxx.com/0103.txt
http://weather.xxx.com/101010300.txt