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101010100=北京
101010200=海淀
101010300=朝阳
101010400=顺义
101010500=怀柔
101010600=通州
101010700=昌平
101010800=延庆
101010900=丰台
101011000=石景山
101011100=大兴
101011200=房山
101011300=密云
101011400=门头沟
101011500=平谷
101011600=八达岭
$arr=file("demo.txt");
$str= join('&',(array_map('trim',$arr)));
parse_str($str,$ar);
echo array_search($_GET['city'],$ar);
<?
$city=$_REQUEST["city"];
$city=iconv("utf-8","gb2312",$city);
if ($city)
{
$fp=fopen("data.txt","r");
while (!feof($fp))
{
$buffer = fgets($fp);
list($code,$area)=explode("=",$buffer);
if (trim($area)==$city)
{
echo $code;
}
}
fclose($fp);
}
?>