<?php
$conn = mysql_connect("127.0.0.1","root","123456") or die("无法连接数据库");
@mysql_query("SET character_set_connection=utf8, character_set_results=utf8, character_set_client=binary",$conn);
mysql_select_db("s517",$conn) or die("无法连接数据库");
global $db;

function getImage($url, $filename="") {
if(!$url) return false;

if(!$filename) {
  $ext=strrchr(strtolower($url),".") ;
  if($ext!=".gif" && $ext!=".jpg" && $ext!=".png") return false;
  $str=explode('/',$url) ;
  $filename=$str[count($str)-1] ;
}

ob_start();
readfile($url);
$img = ob_get_contents();
ob_end_clean();
$fp2=@fopen($filename, "a") ;
fclose($fp2) ;
return $filename;
}

//批量下载

    $result = mysql_query("SELECT itemid, thumb FROM table LIMIT 0 , 300");
    while($row = mysql_fetch_array($result)) {
    getImage($row["thumb"],"");
    echo $row["itemid"]."输出成功";
     }
?>

    $result = mysql_query("SELECT itemid, thumb FROM table LIMIT 0 , 1");
    while($row = mysql_fetch_array($result)) {
    echo getImage($row["thumb"],"")."<br>";
    echo $row["itemid"]."输出成功<br>";
     }

------解决方案--------------------

直接file_get_content file_put_content