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 ( $url , 1 ));
?>
Array ( [ 0] => HTTP/1.1 200 OK [ 1] => Date : Sat, 29 May 2004 12:28:13 GMT [ 2] => Server: Apache/1.3.27 (Unix) (Red-Hat/ Linux) [ 3] => Last-Modified: Wed, 08 Jan 2003 23:11:55 GMT [ 4] => ETag: "3f80f-1b6-3e1cb03b" [ 5] => Accept-Ranges: bytes [ 6] => Content-Length: 438 [ 7] => Connection: close [ 8] => Content-Type: text/ html ) Array ( [ 0] => HTTP/1.1 200 OK [ Date ] => Sat, 29 May 2004 12:28:14 GMT [Server] => Apache/1.3.27 (Unix) (Red-Hat/ Linux) [Last -Modified] => Wed, 08 Jan 2003 23:11:55 GMT [ETag] => "3f80f-1b6-3e1cb03b" [Accept -Ranges] => bytes [Content -Length] => 438 [Connection] => close [Content -Type] => text/ html )
http://php.net/manual/en/function.get-headers.php
array getallheaders ( void )
This function is an alias for apache_request_headers() . Please read the apache_request_headers() documentation for more information on how this function works.
An associative array of all the HTTP headers in the current request, or FALSE on failure.
我們可以自己寫這個函數：
在PHP裡，想要得到所有的HTTP請求頭，可以使用 getallheaders 方法，不過此方法並不是在任何環境下都存在，比如說，你使用fastcgi方式運行PHP的話，就沒有這個方法，所以說我們還需要考慮別的方法，幸運的是$_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] => )
| 
