php 下载图片到服务器

function saveImage($path) {
 if(!preg_match('//([^/]+.[a-z]{3,4})$/i',$path,$matches))
 die('Use image please');
 $image_name = strToLower($matches[1]);
 $ch = curl_init ($path);
 curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
 curl_setopt($ch, CURLOPT_BINARYTRANSFER,1);
 $img = curl_exec ($ch);
 curl_close ($ch);
//$image_name就是要保存到什么路径,默认只写文件名的话保存到根目录
 $fp = fopen($image_name,'w');//保存的文件名称用的是链接里面的名称
 fwrite($fp, $img);
 fclose($fp);
}
saveImage('http://www.jb51.net/images/logo.gif');

 如果是https的话,就加上这两句

curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);    // https请求 不验证证书和hosts
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE);