/**
?* 保存文件到本地
?* @param 文件路徑 $url
?* @param 保存本地路徑 $savePath
?* @return string
?*/
function downloadFile($url,$savePath='')
{
??? $fileName = getUrlFileExt($url);
??????? $fileName = rand(0,1000).$fileName;
??? $file = file_get_contents($url);
??? file_put_contents($savePath.'/'.$fileName,$file);
??????? return $fileName;
}
?
/**
?* 獲取文件擴展名
?* @param 網頁URL $url
?* @return string
?*/
function getUrlFileExt($url)
{
??? $ary = parse_url($url);
??? $file = basename($ary['path']);
??? $ext = explode('.',$file);
??? return $ext[1];
}

downloadFile("http://blog.jb51.net/wp-content/themes/inove/img/mei.png","/upload/2012/01/")

$ php -r 'print_r(parse_url("http://invalid_host..name/"));'
Array
(
??? [scheme] => http
??? [host] => invalid_host..name
??? [path] => /
)