PHP only requests the size of the Web page file, do not return the page content, how to solve

PHP only requests the size of the Web page file, does not return the page content,
In fact, I want to analyze the export links of tens of thousands of sites at once, so to download the source code,

In fact, some of the site's source code is very long, it will hinder the efficiency of my program execution, so I would like to not return the content of the Web page to obtain the size of the Web file, before deciding whether to perform the analysis
------Solution--------------------
Print_r ( get_headers(' http://forum.csdn.net/PointForum/Manage/TopicManageView.aspx?forumID=94985a29-c8e9-4552-9be4-b01061443744 &topicid=0758c3a4-5c85-4434-8a26-0d2c9ccc4c45&date=2012-09-06+21%3a18%3a02&v=-1 ', 1));


Array
(
[0] = = http/1.1-OK
[Server] = nginx/0.7.68
[Date] = Thu, Sep 13:29:26 GMT
[Content-type] = text/html; Charset=utf-8
[Connection] = Close
[Vary] = accept-encoding
[ETag] = ""
[X-ua-compatible] = Ie=emulateie7
[x-powered-by] = ASP.
[Cache-control] = private
[Content-length] = 4410
)

------Solution--------------------
This is seldom used. Study.
------Solution--------------------
Get_headers () returns an array that contains the headers sent by the server in response to an HTTP request. If it fails, it returns false and emits an e_warning level error message.


If the optional format parameter is set to 1, Get_headers () parses the corresponding information and sets the array's key name.

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