使用PHP的全局变量$_SERVER可以获取到很多你想要的结果，比如我们查看浏览器信息，什么浏览器，什么版本。获取这些信息干嘛用，可以用来分析用户的习惯等等。
比如，大家都是用chrome浏览器，什么版本。不怎么用IE浏览器，或者，历史记录中没有IE 6的用户访问，那我们做网站的时候就不用考虑ie6兼容，是吧。
先说说简单查看浏览器信息：
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<?php echo $_SERVER['HTTP_USER_AGENT']; ?> |
我的浏览器输出下面的东西，
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Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/33.0.1750.154 Safari/537.36 |
再比如检查用户是不是IE浏览器：
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<?php if (strpos($_SERVER['HTTP_USER_AGENT'], 'MSIE') !== FALSE) { echo '正在使用 Internet Explorer。<br />'; }else{ echo '没有使用 Internet Explorer。<br />'; } ?> |
输出：
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没有使用 Internet Explorer。 |
大家可以var_dump($_SERVER)，还有很多东西可供挖掘。
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array (size=36) 'HTTP_HOST' => string 'www.cms.com' (length=11) 'HTTP_CONNECTION' => string 'keep-alive' (length=10) 'HTTP_CACHE_CONTROL' => string 'max-age=0' (length=9) 'HTTP_ACCEPT' => string 'text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8' (length=74) 'HTTP_USER_AGENT' => string 'Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/33.0.1750.154 Safari/537.36' (length=109) 'HTTP_DNT' => string '1' (length=1) 'HTTP_ACCEPT_ENCODING' => string 'gzip,deflate,sdch' (length=17) 'HTTP_ACCEPT_LANGUAGE' => string 'zh-CN,zh;q=0.8,en;q=0.6,ja;q=0.4,zh-TW;q=0.2' (length=44) 'HTTP_COOKIE' => string '__utma=246827798.697946392.1392285738.1395130732.1395993418.3; __utmb=246827798.2.10.1395993418; __utmc=246827798; __utmz=246827798.1392285738.1.1.utmcsr=(direct)|utmccn=(direct)|utmcmd=(none)' (length=192) 'PATH' => string 'C:\Program Files (x86)\AMD APP\bin\x86_64;C:\Program Files (x86)\AMD APP\bin\x86;C:\Program Files (x86)\Intel\iCLS Client\;C:\Program Files\Intel\iCLS Client\;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Program Files\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files\Intel\Intel(R) Management Engine Components\IPT;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files (x86)\Intel\Intel(R) Management Eng'... (length=715) 'SystemRoot' => string 'C:\Windows' (length=10) 'COMSPEC' => string 'C:\Windows\system32\cmd.exe' (length=27) 'PATHEXT' => string '.COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH;.MSC' (length=53) 'WINDIR' => string 'C:\Windows' (length=10) 'SERVER_SIGNATURE' => string '' (length=0) 'SERVER_SOFTWARE' => string 'Apache/2.4.4 (Win64) PHP/5.4.12' (length=31) 'SERVER_NAME' => string 'www.cms.com' (length=11) 'SERVER_ADDR' => string '127.0.0.1' (length=9) 'SERVER_PORT' => string '80' (length=2) 'REMOTE_ADDR' => string '127.0.0.1' (length=9) 'DOCUMENT_ROOT' => string 'D:/SoftWare/wamp/www/web/cms/' (length=29) 'REQUEST_SCHEME' => string 'http' (length=4) 'CONTEXT_PREFIX' => string '' (length=0) 'CONTEXT_DOCUMENT_ROOT' => string 'D:/SoftWare/wamp/www/web/cms/' (length=29) 'SERVER_ADMIN' => string 'admin@example.com' (length=17) 'SCRIPT_FILENAME' => string 'D:/SoftWare/wamp/www/web/cms/test.php' (length=37) 'REMOTE_PORT' => string '52730' (length=5) 'GATEWAY_INTERFACE' => string 'CGI/1.1' (length=7) 'SERVER_PROTOCOL' => string 'HTTP/1.1' (length=8) 'REQUEST_METHOD' => string 'GET' (length=3) 'QUERY_STRING' => string '' (length=0) 'REQUEST_URI' => string '/test.php' (length=9) 'SCRIPT_NAME' => string '/test.php' (length=9) 'PHP_SELF' => string '/test.php' (length=9) 'REQUEST_TIME_FLOAT' => float 1395993591.926 'REQUEST_TIME' => int 1395993591 |
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