PHP学习之预定义变量(实例讲解)
超全局变量
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。
以上例程的输出类似于： $fooinglobalscope:Examplecontent $fooincurrentscope:localvariable
$_SERVER
"; var_dump($_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(WindowsNT10.0;WOW64)AppleWebKit/537.36(KHTML,likeGecko)Chrome/53.0.2785.104Safari/537.36Core/1.53.3538.400QQBrowser/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\MozillaFirefox\firefox.exe;D:\Work\phantomjs\bin;D:\Work\chormedriver;C:\WINDOWS\system32\config\systemprofile\.dnx\bin;C:\ProgramFiles\MicrosoftDNX\Dnvm\;C:\ProgramFiles\MicrosoftSQLServer\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/1.0.2gPHP/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'=>float1510122616.201 'REQUEST_TIME'=>int1510122616
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