include 'snoopy/Snoopy.class.php';
   
$snoopy = new Snoopy();
   
$sourceURL = "http://www.dbjr.com.cn";
$snoopy->fetchlinks($sourceURL);
   
$a = $snoopy->results;

//匹配圖片的正則表達(dá)式
 $reTag = "/<img[^s]+src="(http://[^"]+).(jpg|png|gif|jpeg)"[^/]*/>/i";

<meta http-equiv='content-type' content='text/html;charset=utf-8'>
<?php
    include 'snoopy/Snoopy.class.php';
   
    $snoopy = new Snoopy();
   
    $sourceURL = "http://xxxxx";
    $snoopy->fetchlinks($sourceURL);
   
    $a = $snoopy->results;
    $re = "/d+.html$/";
   
    //過(guò)濾獲取指定的文件地址請(qǐng)求
    foreach ($a as $tmp) {
        if (preg_match($re, $tmp)) {
            getImgURL($tmp);
        }
    }
   
    function getImgURL($siteName) {
        $snoopy = new Snoopy();
        $snoopy->fetch($siteName);
       
        $fileContent = $snoopy->results;
       
        //匹配圖片的正則表達(dá)式
        $reTag = "/<img[^s]+src="(http://[^"]+).(jpg|png|gif|jpeg)"[^/]*/>/i";
       
        if (preg_match($reTag, $fileContent)) {
            $ret = preg_match_all($reTag, $fileContent, $matchResult);
           
            for ($i = 0, $len = count($matchResult[1]); $i < $len; ++$i) {
                saveImgURL($matchResult[1][$i], $matchResult[2][$i]);
            }
        }
    }
   
    function saveImgURL($name, $suffix) {
        $url = $name.".".$suffix;
       
        echo "請(qǐng)求的圖片地址：".$url."<br/>";
       
        $imgSavePath = "E:/xxx/style/images/";
        $imgId = preg_replace("/^.+/(d+)$/", "\1", $name);
        if ($suffix == "gif") {
            $imgSavePath .= "emotion";
        } else {
            $imgSavePath .= "topic";
        }
        $imgSavePath .= ("/".$imgId.".".$suffix);
       
        if (is_file($imgSavePath)) {
            unlink($imgSavePath);
            echo "<p style='color:#f00;'>文件".$imgSavePath."已存在，將被刪除</p>";
        }
       
        $imgFile = file_get_contents($url);
        $flag = file_put_contents($imgSavePath, $imgFile);
       
        if ($flag) {
            echo "<p>文件".$imgSavePath."保存成功</p>";
        }
    }
?>

<?php
$mode = "r+";
$filename = "d:/file.txt";
$fp = fopen($filename, $mode);
if ($fp) {
 $i = 1;
 while (!feof($fp)) {
    $str = fgets($fp);
    echo $str;
    if ($i == 1) {
      $len = strlen($str);
      fseek($fp, -$len, SEEK_CUR);//指針向前移動(dòng)
      fwrite($fp, "123");
    }
    i++;
  }
  fclose($fp);
}
?>