改进后的《自动显示天气预报》小程序（Linux和Windows环境都可以）-PHP教程,PHP应用

这次改进，主要是增加了图象的获取，并提供了一个比较完整的获取远端文件的函数。具体代码如下：
<?
$fcont=file("http://www.bjmb.gov.cn/today.asp");
$arr=array();
for($i=0;$i<count($fcont);$i++){
    $tmp=$fcont[$i];
    $tmp=ereg_replace("<br>"," ",$tmp);
    if(!strstr(strtolower($tmp),"img")){
        $tmp=trim(strip_tags($tmp));
    } else {
        $st=ereg_replace("><",">⌒<",$tmp);
        $stt=split("⌒",$st);
        foreach($stt as $key => $value){
            if(strstr($value,"img") ){
                $tmp=$value;
                if(strstr($tmp,"bt9.jpg") || strstr($tmp,"colline.gif")){
                    $tmp="";
                }else{
                    $tmp=ereg_replace("\"","",$tmp);
                    $st=split("src=",$tmp);
                    $st1=split(" ",$st[1]);getpic("http://www.bjmb.gov.cn/$st1[0]","image");
                    if(count($st)>2){
                    $st2=split(" ",$st[2]);getpic("http://www.bjmb.gov.cn/$st1[0]","image");
                    }
                    $tmp=ereg_replace("src=","width=30 height=30 align=absmiddle src=",$tmp);
                }
            }
        }
    }
    if(trim($tmp)!="" && trim($tmp)!="　") $arr[]=$tmp;
}
$yb=array();
for($i=2;$i<count($arr)-6;$i++){
    $yb[]=$arr[$i];
}
?>
<br>
<script language="javascript">
<!–
syb="";
<?
$exp="-3-7-9-14-18-20-25-";
for ($i=1;$i<count($yb);$i++){
    if (!strstr($exp,"-".(string)($i+1)."-")){
?>
    syb=syb+<?=$yb[$i];?> ;
<?}}?>
document.write("<?=$yb[0]?>"+":");
document.write("<marquee width=400 align=middle scrollamount=5 scrolldelay=200>"+syb+"预报</marquee>");
//–>
</script>
<?
function getpic($url,$dir){
    $tmp=split("/",$url);
    $fname=$tmp[count($tmp)-1];
    if(strstr($dir,"\\")){
        if(substr($dir,-2)=="\\") $file=$dir.$fname;else $file=$dir."\\".$fname;
    }else{        
        if(substr($dir,"/")){
            if(substr($dir,-1)=="/") $file=$dir.$fname;else $file=$dir."/".$fname;
        }
        else{
            return ;
        }
    }
    if(!(file_exists("$dir") && is_dir("$dir"))) mkdir($dir,0777);
    if(file_exists($file)) return ;
    $fpo=fopen($file,"wb");
    if(!$fpo) return ;
    $num=0;
    do{
        $num++;
        $fpi=fopen($url,"r");
    }while(!$fpi && $num<3);
    if(!fpi)    return ;
    while(!feof($fpi)){
        $cont=fread($fpi,128);
        fwrite($fpo,$cont,128);
    }
    fclose($fpi);
    fclose($fpo);
}
?>