Question

php 如何实现批量监测网页中的某一内容是否发生变化

Answer 1

<?php
    header("content-type:text/html; charset=utf-8");        
    $fileurl="url2.txt";     
    $gdomain = @file_get_contents($fileurl,r);//获取文件url2.txt内容
    $gdomain = split("\n",$gdomain);
    set_time_limit(0);
    ob_end_flush();//关闭缓存   
    foreach($gdomain as $key=>$domain){      
        $url="http://".$domain;  
         
        $fp = @fopen($url,r) or die ("超时,或网络无法连接！");
        $gcont = @file_get_contents($url);
         
        $pattern1='<title>(.*)</title>';            
        @preg_match_all($pattern1,$gcont,$rg);      
        //保存到本地 
             $of = fopen('temp.txt','a');//创建并打开temp.txt
             if($of){               
                if(!empty($rg[1])){ 
                        //
                        //对比两个文本内容是否一致实现
                        //
                        //
                        echo "<a href='$url'>$domain</a> 当前标题: ".$rg[1]."<br/>";                      
                        fwrite($of,$rg[1]);
                }else {             
                    echo "<a href='$url'>$domain</a> 标题不存在！<br/>";
                    fwrite($of,"null \r\n");//标记为null                   
                }
             }
            fclose($of);        
        flush();
        sleep(3); 
    }
?>