用php获取远程图片并把它保存到本地的代码

<?php
function GrabImage($url,$filename="") {
if($url==""):return false;endif;

if($filename=="") {
$ext=strrchr($url,".");
if($ext!=".gif" && $ext!=".jpg"):return false;endif;
$filename=date("dMYHis").$ext;
}

ob_start();
readfile($url);
$img = ob_get_contents();
ob_end_clean();
$size = strlen($img);

$fp2=@fopen($filename, "a");
fwrite($fp2,$img);
fclose($fp2);

return $filename;
}

$img=GrabImage("http://news.bbc.co.uk/images/_1978837_detector_ap100.jpg","");
if($img):echo '

?>

dedecms中的:

   if(!empty($saveremoteimg))   
    {   
            $body = stripslashes($body);   
            $img_array = array();   
            preg_match_all("/(src|SRC)=[\"|'| ]{0,}(http:\/\/(.*)\\.(gif|jpg|jpeg|bmp|png))/isU",$body,$img_array);   
            $img_array = array_unique($img_array[2]);   
            set_time_limit(0);   
            $imgUrl = $img_dir."/".strftime("%Y%m%d",time());   
            $imgPath = $base_dir.$imgUrl;   
            $milliSecond = strftime("%H%M%S",time());   
            if(!is_dir($imgPath)) @mkdir($imgPath,0777);   
            foreach($img_array as $key =>$value)   
            {   
                    $value = trim($value);   
                    $get_file = @file_get_contents($value);   
                    $rndFileName = $imgPath."/".$milliSecond.$key.".".substr($value,-3,3);   
                    $fileurl = $imgUrl."/".$milliSecond.$key.".".substr($value,-3,3);   
                    if($get_file)   
                    {   
                            $fp = @fopen($rndFileName,"w");   
                            @fwrite($fp,$get_file);   
                            @fclose($fp);   
                    }   
                    $body = ereg_replace($value,$fileurl,$body);   
            }   
            $body = addslashes($body);   
    }