get_headers() 是PHP系統(tǒng)級函數(shù)，他返回一個包含有服務(wù)器響應(yīng)一個 HTTP 請求所發(fā)送的標頭的數(shù)組。如果失敗則返回 FALSE 并發(fā)出一條 E_WARNING 級別的錯誤信息(可用來判斷遠程文件是否存在)。

函數(shù)定義

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

參數(shù)

url 目標 URL

format 如果將可選的 format 參數(shù)設(shè)為 1，則 get_headers() 會解析相應(yīng)的信息并設(shè)定數(shù)組的鍵名。

示例

<?php
$url='http://www.phpernote.com';
print_r(get_headers($url));
print_r(get_headers($url,1));
?>

以上例程的輸出類似于：

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
)