"101010100","海淀"=>"101010200","朝阳"=>"101010300"); foreach ($citycode as $arr) { echo "/> "101010100","海淀"=>"101010200","朝阳"=>"101010300"); foreach ($citycode as $arr) { echo ">
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foreach 输出遇到的有关问题,求各位老师解决

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Release: 2016-06-13 12:18:05
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foreach 输出遇到的问题,求各位老师解决
$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?
------解决思路----------------------

<br /><?php<br /><br />$citycode = array("北京"=>"101010100","海淀"=>"101010200","朝阳"=>"101010300");<br /><br />foreach ($citycode as $arr => $value) {<br />    $citycode[$arr] .= ',';<br />}<br />// saveFile('file.txt',$arr);<br />file_put_contents('file.txt', $citycode);<br /><br />?><br />
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------解决思路----------------------
这样岂不是更简单
$arr = implode(',', $citycode);<br />saveFile('file.txt',$arr);
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------解决思路----------------------
<br />$citycode = array("北京"=>"101010100","海淀"=>"101010200","朝阳"=>"101010300");<br />saveFile('file.txt',implode(',',$citycode));<br />
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