php下载文件并保存到指定文件夹

php下载图片并保存到指定文件夹

function GrabImage($url, $dir, $filename=''){
if(empty($url)){
return false;
}
$ext = strrchr($url, '.');
if($ext != '.gif' && $ext != ".jpg" && $ext != ".bmp"){
echo "格式不支持！";
return false;
}

$dir = realpath($dir);
//目录+文件
$filename = (empty($filename) ? '/'.time().''.$ext : '/'.$filename);
$filename = $dir . $filename;
//开始捕捉
ob_start();
readfile($url);
$img = ob_get_contents();
ob_end_clean();
$size = strlen($img);
$fp2 = fopen($filename , "a");
fwrite($fp2, $img);
fclose($fp2);
return $filename;
}

//测试
$imgpath="https://ss0.bdstatic.com/94oJfD_bAAcT8t7mm9GUKT-xh_/timg?image&quality=100&size=b4000_4000&sec=1483602960&di=f93d78756010023602ecb700b802658f&src=http://pic.90sjimg.com/back_pic/u/00/38/54/05/560412efec2d6.jpg";
GrabImage($imgpath,"D://img");//(图片地址,存放目录,存放显示文件名称)；