php - $_SERVER['HTTP_HOST'] shows only domain name without www -


even if in url write "www.", $_server['http_host'] have domain.com without "www."

i can't redirect non-www www because of this. how fix issue?

      ["http_host"]=>       string(8) "ca-fi.ru"       ["http_cookie"]=>       string(120) "d7b6b86aae18e551749a9da9d54f3daf=floar2lr37318dc76ask49bii5; 849c6485c12558d081c065b4d94a566b=d9iqj8s6oqo41kipg3qaefq497"       ["http_user_agent"]=>       string(99) "mozilla/5.0 (windows nt 6.1) applewebkit/536.5 (khtml, gecko) chrome/19.0.1084.52 safari/536.5"        ["path"]=>       string(28) "/usr/local/bin:/usr/bin:/bin"       ["server_signature"]=>       string(69) "     apache/2.2.20 (ubuntu) server @ ca-fi.ru port 80      "       ["server_software"]=>       string(22) "apache/2.2.20 (ubuntu)"       ["server_name"]=>       string(8) "ca-fi.ru"       ["server_addr"]=>       string(13) "192.168.10.12"       ["server_port"]=>       string(2) "80"       ["remote_addr"]=>       string(12) "192.168.10.1"       ["document_root"]=>       string(8) "/var/www"        ["request_method"]=>       string(3) "get"        ["request_uri"]=>       string(1) "/"       ["script_name"]=>       string(10) "/index.php"       ["php_self"]=>       string(10) "/index.php"       ["request_time"]=>       int(1338819407)

if want redirect non-www www, i'd recommend not using phps header() function (which assume you're using), use mod rewrite.

create .htaccess file in root directory following content:

rewriteengine on rewritecond %{http_host} ^example.com [nc] rewriterule ^(.*)$ http://www.example.com/$1 [l,r=301]

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