PHP学习之预定义变量实例讲解

超html' target='_blank'>全局变量

超全局变量–超全局变量是全部作用域中始终可用的内置变量

$GLOBALS

一个包含了全部变量的全局组合数组。变量的名字就是数组的键。

 ?phpfunction test() { $foo = local variable  echo $foo in global scope: . $GLOBALS[ foo ] . /n  echo $foo in current scope: . $foo . /n $foo = Example content test();以上例程的输出类似于：$foo in global scope: Example content$foo in current scope: local variable

$_SERVER

 ?PHPecho pre var_dump($_SERVER);output:array (size=35) HTTP_HOST = string localhost (length=9) HTTP_CONNECTION = string keep-alive (length=10) HTTP_UPGRADE_INSECURE_REQUESTS = string 1 (length=1) HTTP_USER_AGENT = string Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/53.0.2785.104 Safari/537.36 Core/1.53.3538.400 QQBrowser/9.6.12501.400 (length=153) HTTP_ACCEPT = string text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8 (length=74) HTTP_REFERER = string http://localhost/test/ (length=22) HTTP_ACCEPT_ENCODING = string gzip, deflate, sdch (length=19) HTTP_ACCEPT_LANGUAGE = string zh-CN,zh;q=0.8 (length=14) PATH = string %APPCAN_PATH%;D:/Work/python2.7/;D:/Work/python2.7/Scripts;C:/ProgramData/Oracle/Java/javapath;C:/WINDOWS/system32;C:/WINDOWS;C:/WINDOWS/System32/Wbem;C:/WINDOWS/System32/WindowsPowerShell/v1.0/;D:/wampserver/mysql/bin;D:/Work/JAVA/tomcat/bin;D:/Work/Mozilla Firefox/firefox.exe;D:/Work/phantomjs/bin;D:/Work/chormedriver;C:/WINDOWS/system32/config/systemprofile/.dnx/bin;C:/Program Files/Microsoft DNX/Dnvm/;C:/Program Files/Microsoft SQL Server/130/Tools/Binn/;D:/wampserver/php;C:/ProgramData/ComposerSetup/bi ... (length=607) SystemRoot = string C:/WINDOWS (length=10) COMSPEC = string C:/WINDOWS/system32/cmd.exe (length=27) PATHEXT = string .COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH;.MSC (length=53) WINDIR = string C:/WINDOWS (length=10) SERVER_SIGNATURE = string (length=0) SERVER_SOFTWARE = string Apache/2.4.18 (Win64) OpenSSL/1.0.2g PHP/5.6.19 (length=47) SERVER_NAME = string localhost (length=9) SERVER_ADDR = string ::1 (length=3) SERVER_PORT = string 80 (length=2) REMOTE_ADDR = string ::1 (length=3) DOCUMENT_ROOT = string D:/wampserver/www (length=17) REQUEST_SCHEME = string http (length=4) CONTEXT_PREFIX = string (length=0) CONTEXT_DOCUMENT_ROOT = string D:/wampserver/www (length=17) SERVER_ADMIN = string admin@example.com (length=17) SCRIPT_FILENAME = string D:/wampserver/www/test/$_SERVER.php (length=35) REMOTE_PORT = string 57305 (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/$_SERVER.php (length=18) SCRIPT_NAME = string /test/$_SERVER.php (length=18) PHP_SELF = string /test/$_SERVER.php (length=18) REQUEST_TIME_FLOAT = float 1510122616.201 REQUEST_TIME = int 1510122616

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