Question

我正在使用get_headers（），我想返回内容长度。在下面的数组中，内容长度是键号9，但我发现内容长度并不总是键号9.我不确定为什么它不总是相同的键？如何搜索数组并始终返回内容长度，无论它是什么键？因为我在函数中使用它，所以文件的实际文件大小每次都不同。我的示例代码如下。提前谢谢。

Array ( [0] => HTTP/1.0 200 OK [1] => Server: Apache [2] => Pragma: public [3] => Last-Modified: Sun, 01 Apr 2012 07:59:46 GMT [4] => ETag: "1333267186000" [5] => Content-Type: text/javascript [6] => Cache-Control: must-revalidate, max-age=0, post-check=0, pre-check=0 [7] => Expires: Sun, 01 Apr 2012 10:27:26 GMT [8] => Date: Sun, 01 Apr 2012 10:27:26 GMT [9] => Content-Length: 31650 [10] => Connection: close [11] => Set-Cookie: JSESSIONID=M0V4NTTVSIB4WCRHAWVSFGYKE2C0UIV0; path=/ [12] => Set-Cookie: DYN_USER_ID=2059637079; path=/ [13] => Set-Cookie: DYN_USER_CONFIRM=6c6a03988da3de6d704ce37a889b1ec8; path=/ [14] => Set-Cookie: BIGipServerdiy_pool=637871882.20480.0000; path=/ )

function headInfo($url) {
    $header = get_headers($url);
    $fileSize = $header[9];
    return array($header, $fileSize);
}

Answer 1

http://php.net/get_headers

第二个参数：

如果可选格式参数设置为非零，则get_headers（）会解析响应并设置数组的键。

所以，只需传递1作为第二个参数，$ header ['Content-Length']就是你所追求的。

Answer 2

get_headers($url,true);

Answer 3

如果查看get_headers()函数文档，您可能会注意到，有第二个（默认）参数可用于指定输出格式。

$hdr = get_headers($url, 1);
echo("Content-length: " . $hdr["Content-length"]);

1 - 表示该函数将返回关联数组。

Answer 4

基本上

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

示例：

get_headers($url,true);

将为您提供关联数组

详细

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

 print_r(get_headers($url));

 print_r(get_headers($url, 1));
 ?>

这将产生

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
)

希望它有助于

检查数组php中的密钥

4 个答案: