与大家分享一些php常用的采集函数，专业页面专用了

最近想给自己的网站增加个内容抓取功能，有现成函数的朋友发几个给我

答案：
// ####################### 获取文件流并转换成字符串 #######################
function openfile($url)
{
if(file($url)){
        $str = file($url);
        $count = count($str);
        for ($i=0;$i<$count;$i++){
        $file .= $str[$i];
        }
      return $file;
       } else {
       die("文件打开失败!");
       }
}
// ####################### 切分字符串 #######################
function cut($start,$end,$file){
        $content=explode($start,$file);
        $content=explode($end,$content[1]);
        return  $content[0];
}
// ####################### 清除垃圾代码 #######################
function del($start,$end,$content){
       $del=cut($start,$end,$content);
       $content=str_replace($del,"",$content);
       $content=str_replace($start.$end,"",$content);
       return $content;
     
    
}
// ####################### 分析域名 #######################
function getname($url)
{
$referer = preg_replace("/https?:\/\/([^\/]+).*/i", "\\1", $url);
$referer = str_replace("www.", "", $referer);
return $referer;
}

// ####################### 清除HTML代码table #######################
function clstable($content)
{
$clscontent= preg_replace("/<table[^>]*?>.*?<\/table>/si", "", $content);
return $clscontent;
}
// ####################### 清除HTML代码script #######################
function clsscript($content)
{
$clscontent= preg_replace("/<script[^>]*?>.*?<\/script>/si", "", $content);
return $clscontent;
}
// ####################### 清除HTML代码div #######################
function clsdiv($content)
{
$clscontent= preg_replace("/<div[^>]*?>.*?<\/div>/si", "", $content);
return $clscontent;
}

// ####################### 清除HTML代码iframe #######################
function clsifr($content)
{
$clscontent= preg_replace("/<IFRAME[^>]*?>.*?<\/IFRAME>/si", "", $content);
return $clscontent;
}

// ####################### 清除HTML代码tr,td #######################
function clstrtd($content)
{
$clscontent= preg_replace("/<td[^>]*?>.*?<\/td>/si", "", $content);
$clscontent= preg_replace("/<tr[^>]*?>.*?<\/tr>/si", "", $clscontent);
$clscontent= preg_replace("/<tr[^>]*?>/si","",$clscontent);
$clscontent= preg_replace("/<td[^>]*?>/si","",$clscontent);
$clscontent= preg_replace("/<\/tr>/si","",$clscontent);
$clscontent= preg_replace("/<\/td>/si","",$clscontent);
return $clscontent;
}
// ####################### 清除HTML代码超链接 #######################
function clsa($content)
{
$clscontent= preg_replace("/<a[^>]*?>.*?<\/a>/si", "", $content);
return $clscontent;
}
// ####################### 彻底清除所有HTML代码#######################
function clearhtml($content)
{
$search = array ("'<script[^>]*?>.*?</script>'si",  // 去掉 javascript
                 "'<[\/\!]*?[^<>]*?>'si",           // 去掉 HTML 标记
                 "'([\r\n])[\s]+'",                 // 去掉空白字符
                 "'&(quot|#34);'i",                 // 替换 HTML 实体
                 "'&(amp|#38);'i",
                 "'&(lt|#60);'i",
                 "'&(gt|#62);'i",
                 "'&(nbsp|#160);'i",
                 "'&(iexcl|#161);'i",
                 "'&(cent|#162);'i",
                 "'&(pound|#163);'i",
                 "'&(copy|#169);'i",
                 "'&#(\d+);'e");                    // 作为 PHP 代码运行
$replace = array ("",
                  "",
                  "\\1",
                  "\"",
                  "&",
                  "<",
                  ">",
                  " ",
                  chr(161),
                  chr(162),
                  chr(163),
                  chr(169),
                  "chr(\\1)");
$text = preg_replace ($search, $replace, $content);
return $text;
}
// ####################### 写入缓存文件 #######################
function writetocache($cachedir,$cachename, $cachedata = '') {
    $cachedir = './'.$cachedir.'/';
    $cachefile = $cachedir.$cachename.'.php';
    if(!is_dir($cachedir)) {
                        @mkdir($cachedir, 0777);
          }
    if(!is_dir($cachedir)) {
      @mkdir($cachedir, 0777);
    }
    if(@$fp = fopen($cachefile, 'wb')) {
      @fwrite($fp, $cachedata);
  

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