PHP $_server[' http_user_agent ' Usage introduction _php tutorial

In PHP http_user_agent is used to obtain user-related information, including the user browser, the operation of systems engineering, whether the installation of Alex Toolbar Oh, and other information, there is a need to understand the friends can refer to.

1. When the user accesses the server, use PHP's super global variable $_server array field [' Http_user_agent '] to get access to all of the user's information

The code is as follows	Copy Code
echo $_server[' http_user_agent ']; ?>

Output results

mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; trident/4.0;. NET CLR 2.0.50727; infopath.2; asktbptv/5.17.0.25589; Alexa Toolbar)

2. Using regular expressions to match the above string, the user's browser operating system information

3.PHP according to the matching string (user's browser operating system information), the allocation of required CSS files, JS and so on ... Return to User

My browser's operating system information
Browser:chrome 5.0

Platform:windows 7

The code is as follows

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Display the browser information of the Access user Echo ' Browser: '. Determinebrowser ($Agent). ' '; Show access to the user's operating system platform Echo ' Platform: '. Determineplatform ($Agent). ' '; A positive value expression that is better than parsing the string in $_server[' Http_user_agent '] gets access to the user's browser information function Determinebrowser ($Agent) { $browseragent = ""; Browser $browserversion = ""; Version of the browser if (Ereg (' MSIE ([0-9].[ 0-9]{1,2}) ', $Agent, $version)) { $browserversion = $version [1]; $browseragent = "Internet Explorer"; } else if (Ereg (' opera/([0-9]{1,2}.[ 0-9]{1,2}) ', $Agent, $version)) { $browserversion = $version [1]; $browseragent = "Opera"; } else if (Ereg (' firefox/([0-9.] {1,5}) ', $Agent, $version)} { $browserversion = $version [1]; $browseragent = "Firefox"; }else if (Ereg (' chrome/([0-9.] {1,3}) ', $Agent, $version)} { $browserversion = $version [1]; $browseragent = "Chrome"; } else if (Ereg (' safari/([0-9.] {1,3}) ', $Agent, $version)} { $browseragent = "Safari"; $browserversion = ""; } else { $browserversion = ""; $browseragent = "Unknown"; } return $browseragent. " ". $browserversion; } Similarly get access to the user's browser information function Determineplatform ($Agent) { $browserplatform = = "; if (eregi (' win ', $Agent) && strpos ($Agent, ' 95 ')) { $browserplatform = "Windows 95"; } ElseIf (Eregi (' Win 9x ', $Agent) && strpos ($Agent, ' 4.90 ')) { $browserplatform = "Windows ME"; } ElseIf (eregi (' win ', $Agent) && ereg (' 98 ', $Agent)) { $browserplatform = "Windows 98"; } ElseIf (eregi (' win ', $Agent) && eregi (' NT 5.0 ', $Agent)) { $browserplatform = "Windows 2000"; } ElseIf (eregi (' win ', $Agent) && eregi (' NT 5.1 ', $Agent)) { $browserplatform = "Windows XP"; } ElseIf (eregi (' win ', $Agent) && eregi (' NT 6.0 ', $Agent)) { $browserplatform = "Windows Vista"; } ElseIf (eregi (' win ', $Agent) && eregi (' NT 6.1 ', $Agent)) { $browserplatform = "Windows 7"; } ElseIf (eregi (' win ', $Agent) && ereg (' + ', $Agent)) { $browserplatform = "Windows 32"; } ElseIf (eregi (' win ', $Agent) && eregi (' NT ', $Agent)) { $browserplatform = "Windows NT"; }elseif (eregi (' Mac OS ', $Agent)) { $browserplatform = "Mac OS"; } ElseIf (eregi (' Linux ', $Agent)) { $browserplatform = "Linux"; } ElseIf (eregi (' Unix ', $Agent)) { $browserplatform = "Unix"; } ElseIf (Eregi (' Sun ', $Agent) && eregi (' OS ', $Agent)) { $browserplatform = "SunOS"; } ElseIf (eregi (' IBM ', $Agent) && eregi (' OS ', $Agent)) { $browserplatform = "IBM os/2"; } ElseIf (eregi (' Mac ', $Agent) && eregi (' PC ', $Agent)) { $browserplatform = "Macintosh"; } ElseIf (eregi (' PowerPC ', $Agent)) { $browserplatform = "PowerPC"; } ElseIf (eregi (' AIX ', $Agent)) { $browserplatform = "AIX"; } ElseIf (eregi (' HPUX ', $Agent)) { $browserplatform = "HPUX"; } ElseIf (eregi (' NetBSD ', $Agent)) { $browserplatform = "NetBSD"; } ElseIf (eregi (' BSD ', $Agent)) { $browserplatform = "BSD"; } ElseIf (Ereg (' OSF1 ', $Agent)) { $browserplatform = "OSF1"; } ElseIf (Ereg (' IRIX ', $Agent)) { $browserplatform = "IRIX"; } ElseIf (eregi (' FreeBSD ', $Agent)) { $browserplatform = "FreeBSD"; } if ($browserplatform = = ") {$browserplatform =" Unknown ";} return $browserplatform; } ?>

The specific procedures for judging the browser language are as follows

The code is as follows

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$lang = substr ($_server[' http_accept_language '), 0, 4); Take only the first 4 digits, so that only the most preferred language is judged. If take the first 5 bits, may appear en,zh situation, influence judgment. if (Preg_match ("/zh-c/i", $lang)) echo "Simplified Chinese"; else if (Preg_match ("/zh/i", $lang)) echo "Traditional Chinese"; else if (Preg_match ("/en/i", $lang)) echo "中文版"; else if (Preg_match ("/fr/i", $lang)) echo "French"; else if (Preg_match ("/de/i", $lang)) echo "German"; else if (Preg_match ("/jp/i", $lang)) echo "Japanese"; else if (Preg_match ("/ko/i", $lang)) echo "Korean"; else if (Preg_match ("/es/i", $lang)) echo "Spanish"; else if (Preg_match ("/sv/i", $lang)) echo "Swedish"; else echo $_server["Http_accept_language"]; ?>

The browser type is determined mainly by analyzing the content of _server["Http_user_agent", while the analysis browser language is the analysis _server["Http_accept_language".

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