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Full Discussion: Grub Bootloader & CentOS
Operating Systems Linux Red Hat Grub Bootloader & CentOS Post 302965230 by Aia on Monday 25th of January 2016 05:47:08 PM
Old 01-25-2016
In case you do not know yet:
You cannot upgrade from CentOS 6.x to CentOS 7.x. You'll have to perform a replacement of OS.
CentosOS 6.x has Grub legacy. CentOS 7.x has Grub2. They are not the same. You might not get away without learning how these two bootloader work so you can translate what you have in 6.x to 7.x
 

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HTTP_RESPONSE_HEADER(3) 						 1						   HTTP_RESPONSE_HEADER(3)

$http_response_header - HTTP response headers

	The $http_response_header array is similar to the get_headers(3) function. When using the HTTP wrapper, $http_response_header will be pop-
       ulated with the HTTP response headers. $http_response_header will be created in the local scope.

       Example #1

	      $http_response_header example

	      <?php
	      function get_contents() {
		file_get_contents("http://example.com");
		var_dump($http_response_header);
	      }
	      get_contents();
	      var_dump($http_response_header);
	      ?>

	      The above example will output something similar to:

	      array(9) {
		[0]=>
		string(15) "HTTP/1.1 200 OK"
		[1]=>
		string(35) "Date: Sat, 12 Apr 2008 17:30:38 GMT"
		[2]=>
		string(29) "Server: Apache/2.2.3 (CentOS)"
		[3]=>
		string(44) "Last-Modified: Tue, 15 Nov 2005 13:24:10 GMT"
		[4]=>
		string(27) "ETag: "280100-1b6-80bfd280""
		[5]=>
		string(20) "Accept-Ranges: bytes"
		[6]=>
		string(19) "Content-Length: 438"
		[7]=>
		string(17) "Connection: close"
		[8]=>
		string(38) "Content-Type: text/html; charset=UTF-8"
	      }
	      NULL

PHP Documentation Group 												   HTTP_RESPONSE_HEADER(3)
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