http系列一

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我們經常使用file_get_contents函數來開啟檔案，實際上這個函數還可以開啟一個網路地址，實現簡單的網頁抓取，用file-get-contents  open  file  readfile等讀取url時，會建立一個$http_response_header變數來儲存http響應的前序，使用fopen等函數開啟資料流資訊可以使用stream_get_meta_data函數擷取

$html = file_get_contents("http://baidu.com");print_r($http_response_header);/**Array([0] => HTTP/1.1 200 OK[1] => Date: Sat, 15 Nov 2014 16:14:36 GMT[2] => Server: Apache[3] => Cache-Control: max-age=86400[4] => Expires: Sun, 16 Nov 2014 16:14:36 GMT[5] => Last-Modified: Tue, 12 Jan 2010 13:48:00 GMT[6] => ETag: "51-4b4c7d90"[7] => Accept-Ranges: bytes[8] => Content-Length: 81[9] => Connection: Close[10] => Content-Type: text/html)*/$fp = fopen("http://baidu.com", "r");print_r(stream_get_meta_data($fp));/**Array(    [wrapper_data] => Array        (            [0] => HTTP/1.1 200 OK            [1] => Date: Sat, 15 Nov 2014 16:14:36 GMT            [2] => Server: Apache            [3] => Cache-Control: max-age=86400            [4] => Expires: Sun, 16 Nov 2014 16:14:36 GMT            [5] => Last-Modified: Tue, 12 Jan 2010 13:48:00 GMT            [6] => ETag: "51-4b4c7d90"            [7] => Accept-Ranges: bytes            [8] => Content-Length: 81            [9] => Connection: Close            [10] => Content-Type: text/html        )    [wrapper_type] => http    [stream_type] => tcp_socket/ssl    [mode] => r    [unread_bytes] => 81    [seekable] =>     [uri] => http://baidu.com    [timed_out] =>     [blocked] => 1    [eof] => )*/

http系列一