[php] php原生或curl獲取http headers

房東：王曉貞
發表時間：2016-01-20

array get_headers ( string $url [, int $format = 0 ] )

Parameters

url

The target URL.

format

If the optional format parameter is set to non-zero, get_headers() parses the response and sets the array's keys .

設置為非0返會解析響應關聯數組。

Return Values

Returns an indexed or associative array with the headers, or FALSE on failure.

<?php

$url = 'http://www.example.com' ;

print_r ( get_headers ( $url ));

print_r ( get_headers ( $url , 1 ));

?>

 Array    (        [ 0] => HTTP/1.1 200 OK        [ 1] => Date : Sat, 29 May 2004 12:28:13 GMT        [ 2] => Server: Apache/1.3.27 (Unix) (Red-Hat/ Linux)        [ 3] => Last-Modified: Wed, 08 Jan 2003 23:11:55 GMT        [ 4] => ETag: "3f80f-1b6-3e1cb03b"        [ 5] => Accept-Ranges: bytes        [ 6] => Content-Length: 438        [ 7] => Connection: close        [ 8] => Content-Type: text/ html    )     Array    (        [ 0] => HTTP/1.1 200 OK        [ Date ] => Sat, 29 May 2004 12:28:14 GMT        [Server] => Apache/1.3.27 (Unix) (Red-Hat/ Linux)        [Last -Modified] => Wed, 08 Jan 2003 23:11:55 GMT        [ETag] => "3f80f-1b6-3e1cb03b"        [Accept -Ranges] => bytes        [Content -Length] => 438        [Connection] => close        [Content -Type] => text/ html    )

http://php.net/manual/en/function.get-headers.php

array getallheaders ( void )

Fetches all HTTP headers from the current request.

This function is an alias for apache_request_headers() . Please read the apache_request_headers() documentation for more information on how this function works.

An associative array of all the HTTP headers in the current request, or FALSE on failure.

我們可以自己寫這個函數：

在PHP裡，想要得到所有的HTTP請求頭，可以使用 getallheaders 方法，不過此方法並不是在任何環境下都存在，比如說，你使用fastcgi方式運行PHP的話，就沒有這個方法，所以說我們還需要考慮別的方法，幸運的是$_SERVER裡有我們想要的東西，它裡面鍵名以HTTP_開頭的就是HTTP請求頭：

$headers = array(); foreach ( $_SERVER as $key => $value ) { if ( 'HTTP_' == substr ( $key , 0 , 5 )) { $headers [ str_replace ( '_' , '-' , substr ( $key , 5 ))] = $value ; } }

代碼很簡單，需要說明的是RFC裡明確指出了信息頭的名字是不區分大小寫的。

不過並不是所有的HTTP請求頭都是以HTTP_開頭的的鍵的形式存在與$_SERVER裡，比如說Authorization，Content-Length，Content-Type就不是這樣，所以說為了取得所有的HTTP請求頭，還需要加上下面這段代碼：

 if ( isset ( $_SERVER ['PHP_AUTH_DIGEST' ])) {         $header ['AUTHORIZATION'] = $_SERVER ['PHP_AUTH_DIGEST' ]);     } elseif ( isset ( $_SERVER ['PHP_AUTH_USER']) && isset ( $_SERVER ['PHP_AUTH_PW' ])) {         $header ['AUTHORIZATION'] = base64_encode ( $_SERVER ['PHP_AUTH_USER'] . ':' . $_SERVER ['PHP_AUTH_PW' ]));     }     if ( isset ( $_SERVER ['CONTENT_LENGTH' ])) {         $header ['CONTENT-LENGTH'] = $_SERVER ['CONTENT_LENGTH' ];     }     if ( isset ( $_SERVER ['CONTENT_TYPE' ])) {         $header [' CONTENT-TYPE '] = $_SERVER['CONTENT_TYPE' ]; //注意-和下劃線不同 }

http://php.net/manual/zh/function.getallheaders.php

我用$_SERVER['CONTENT_TYPE']出現

Undefined index: CONTENT_TYPE。

curl設置header：http://blog.51yip.com/php/1297.html

curl獲取content type

 <? php      # the request    $ch = curl_init('http://www.google.com' );      curl_setopt( $ch , CURLOPT_RETURNTRANSFER, true );      curl_exec( $ch );       # get the content type    echo curl_getinfo($ch, CURLINFO_CONTENT_TYPE);       # output    text/html; charset=ISO-8859-1  ?>

參考：http://stackoverflow.com/questions/2610713/get-mime-type-of-external-file-using-curl-and-php

我們curl_getinfo如果後面只有一個參數，返回一個array ：

$httpinfo=curl_getinfo($ch);

print_r( $httpinfo);

返回如：

 Array    (        [url] => http: // www.php10086.com/2012/04/605.html     [content_type] => text/html; charset=UTF-8        [http_code] => 200        [header_size] => 344        [request_size] => 71        [filetime] => -1        [ssl_verify_result] => 0        [redirect_count] => 0        [total_time] => 1.545        [namelookup_time] => 0        [connect_time] => 0.172        [pretransfer_time] => 0.172        [size_upload] => 0        [size_download] => 54618        [speed_download] => 35351        [speed_upload] => 0        [download_content_length] => -1        [upload_content_length] => 0        [starttransfer_time] => 0.593        [redirect_time] => 0        [certinfo] => Array            (            )         [primary_ip] => 173.254.29.116        [primary_port] => 80        [local_ip] => 192.168.1.5        [local_port] => 49970        [redirect_url] =>     )

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