How to determine whether a link is valid in PHP

This article mainly introduces the method of PHP to determine whether the link is valid. It has certain reference value. Now I share it with you. Friends in need can refer to it

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

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

If the address is valid, an array is returned, otherwise false is returned. When the second parameter is 1, the corresponding information will be parsed and the key name of the array will be set, and returned Associative array

eg:

<?php
$url = &#39;http://www.investfree-brk.com&#39;;
print_r(get_headers($url));
print_r(get_headers($url, 1));
?>

The above result output is as follows:

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
)

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