代码获取网页上的图片并存储

<?php
function GrabImage($url, $filename=""){
//$url 为空则返回 false;
if($url == ""){return false;}
$ext = strrchr($url, ".");//得到图片的扩展名
if($ext != ".gif" && $ext != ".jpg" && $ext != ".bmp"){echo "格式不支持！";return false;}
if($filename == ""){$filename = time()."$ext";}//以时间戳另起名
//开始捕捉
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;
}
//测试一下
GrabImage("http://news.ef360.com/EditManager/File/News/20130304/20130304100207744.jpg", time().".jpg");
?>