php下获取http状态的实现代码

#方式一
$ch = curl_init('https://www.jb51.net');
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_exec($ch);
echo curl_getinfo($ch, CURLINFO_HTTP_CODE); // 200
curl_close($ch);

print_r(
    get_headers('http://www.baidu.com')
);
#返回以下内容：
/*
Array   
(   
[0] => HTTP/1.1 200 OK   
[1] => Date: Sun, 04 May 2014 03:43:04 GMT   
[2] => Content-Type: text/html; charset=utf-8   
[3] => Connection: Close   
[4] => Vary: Accept-Encoding   
[5] => Set-Cookie: BAIDUID=4977AF4FB1E9A5D13C79939E28D92161:FG=1; expires=Thu, 31-Dec-37 23:55:55 GMT; max-age=2147483647; path=/; domain=.baidu.com   
[6] => Set-Cookie: BDSVRTM=0; path=/   
[7] => Set-Cookie: H_PS_PSSID=4681_1465_5224_6023_4759_6018_6257_6313_6328_6269; path=/; domain=.baidu.com   
[8] => P3P: CP=" OTI DSP COR IVA OUR IND COM "   
[9] => Cache-Control: private   
[10] => Expires: Sun, 04 May 2014 03:42:09 GMT   
[11] => X-Powered-By: HPHP   
[12] => Server: BWS/1.1   
[13] => BDPAGETYPE: 1   
[14] => BDQID: 0x9acb602d00001922   
[15] => BDUSERID: 0   
)   
*/