foreach 追加有關問題，求高手幫忙看看

foreach 追加問題，求高手幫忙看看。

$citycode = array(
"北京"=>"101010100",
"朝陽"=>"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：按行儲存為檔案
*/

saveFile('api/weather.txt',implode("\r\n",$citycode));


?>


我想根據數組儲存為換行檔案，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

要怎麼做？
我現在只能做到：
http://weather.xxx.com/0101.txt
http://weather.xxx.com/0103.txt

怎麼追加進去呢？
------解決思路----------------------

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";
}

你這樣明顯的用t同樣的索引值覆蓋了之前的值嘛，要不就換個索引值如

$citycode[$arr.'1'] = "http://weather.xxx.com/".substr($citycode[$arr], 3,4).".txt";

------解決思路----------------------

$citycode = array(
"北京"=>"101010100",
"朝陽"=>"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

樓主是想這樣嗎？
------解決思路----------------------
$citycode[$arr] .= "http://weather.xxx.com/".$citycode[$arr].".txt";
這裡的$citycode[$arr] 已經被修改了
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";
使用拼接的話你忘記換行了。

改這樣就可以了

$citycode = array(
"北京"=>"101010100",
"朝陽"=>"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：按行儲存為檔案
*/

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

