$citycode = array("北京"=>"101010100","海淀"=>"101010200","朝阳"=>"101010300");
foreach ($citycode as $arr) {
echo $arr.'\\n';
}
saveFile('file.txt',$arr);
我希望file.txt里的内容为：
101010100,101010200,101010300
这个$arr要怎么写？
<?php$citycode = array("北京"=>"101010100","海淀"=>"101010200","朝阳"=>"101010300");foreach ($citycode as $arr => $value) { $citycode[$arr] .= ',';}// saveFile('file.txt',$arr);file_put_contents('file.txt', $citycode);?> 这样岂不是更简单
$arr = implode(',', $citycode);saveFile('file.txt',$arr);
这样岂不是更简单
$arr = implode(',', $citycode);saveFile('file.txt',$arr);
$citycode = array("北京"=>"101010100","海淀"=>"101010200","朝阳"=>"101010300");saveFile('file.txt',implode(',',$citycode));其实我就是在想jordan102的，我写JS写多了，脑子尽然一天没转过弯来。
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
