php check if remote file exists

I used to know that file_exists cannot check whether a remote file exists, but I don’t know how to check whether a remote file exists.

Today when I was reading the PHP Information Research Center blog, I found a function get_headers

The original text is here:
How to check a remote file Does it exist
http://www.xqs.cn/index.php?load=read&id=95

get_headers(PHP5) — Get all headers sent by the server in response to an HTTP request

get_headers() returns an array, Contains the headers sent by the server in response to an HTTP request. If it fails, it returns FALSE and issues an E_WARNING level error message.

If the optional format parameter is set to 1, get_headers() will parse the corresponding information and set the key name of the array.

Returns something like

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
)

I don’t think it’s appropriate for the original author to judge whether to return an array

because the http file status may not be 200 is something else

Because I tested something that does not actually exist on my website. The page status returned should be 404 does not exist, but the original author's function still returns true

In fact, it should be based on the page status returned. Judgment