php的全局变量

代龙涛
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1.$GLOBALS是php的一个全局变量组，在一个脚本作用域内都可以使用

打印的结果如下：

D:\phpstudy_pro\WWW\index2.php:2:

array (size=8) 
  '_GET' => 
    array (size=0) 
      empty
  '_POST' => 
    array (size=0) 
      empty
  '_COOKIE' => 
    array (size=2) 
      'sugstore' => string '0' (length=1) 
      'baikeVisitId' => string '8d420959-b540-4e7e-a145-9f73bdb16b13' (length=36) 
  '_FILES' => 
    array (size=0) 
      empty
  '_SERVER' => 
    array (size=80) 
      'ALLUSERSPROFILE' => string 'C:\ProgramData' (length=14) 
      'APPDATA' => string 'C:\Users\j\AppData\Roaming' (length=26) 
      'CommonProgramFiles' => string 'C:\Program Files\Common Files' (length=29) 
      'CommonProgramFiles(x86)' => string 'C:\Program Files (x86)\Common Files' (length=35) 
      'CommonProgramW6432' => string 'C:\Program Files\Common Files' (length=29) 
      'COMPUTERNAME' => string 'DESKTOP-CCCARJ6' (length=15) 
      'ComSpec' => string 'C:\Windows\system32\cmd.exe' (length=27) 
      'DriverData' => string 'C:\Windows\System32\Drivers\DriverData' (length=38) 
      'HOMEDRIVE' => string 'C:' (length=2) 
      'HOMEPATH' => string '\Users\j' (length=8) 
      'LOCALAPPDATA' => string 'C:\Users\j\AppData\Local' (length=24) 
      'LOGONSERVER' => string '\DESKTOP-CCCARJ6' (length=17) 
      'NUMBER_OF_PROCESSORS' => string '8' (length=1) 
      'NVIDIAWHITELISTED' => string '0x01' (length=4) 
      'OneDrive' => string 'C:\Users\j\OneDrive' (length=19) 
      'OS' => string 'Windows_NT' (length=10) 
      'Path' => string 'C:\Windows\System32;D:\node;d:\Program Files (x86)\Tencent\΢��web�����߹���\dll;C:\Users\j\AppData\Local\Programs\Python\Python310\Scripts;C:\Users\j\AppData\Local\Programs\Python\Python310;C:\Users\j\AppData\Local\Microsoft\WindowsApps;C:\Users\j\AppData\Local\Programs\Microsoft VS Code\bin;d:\Program Files\JetBrains\PyCharm 2021.3.2\bin;D:\phpstudy_pro\Extensions\MySQL5.7.26\bin;C:\Users\j\AppData\Roaming\npm' (length=418) 
      'PATHEXT' => string '.COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH;.MSC' (length=53) 
      'PROCESSOR_ARCHITECTURE' => string 'AMD64' (length=5) 
      'PROCESSOR_IDENTIFIER' => string 'Intel64 Family 6 Model 60 Stepping 3, GenuineIntel' (length=50) 
      'PROCESSOR_LEVEL' => string '6' (length=1) 
      'PROCESSOR_REVISION' => string '3c03' (length=4) 
      'ProgramData' => string 'C:\ProgramData' (length=14) 
      'ProgramFiles' => string 'C:\Program Files' (length=16) 
      'ProgramFiles(x86)' => string 'C:\Program Files (x86)' (length=22) 
      'ProgramW6432' => string 'C:\Program Files' (length=16) 
      'PSModulePath' => string 'C:\Program Files\WindowsPowerShell\Modules;C:\Windows\system32\WindowsPowerShell\v1.0\Modules' (length=93) 
      'PUBLIC' => string 'C:\Users\Public' (length=15) 
      'PyCharm' => string 'd:\Program Files\JetBrains\PyCharm 2021.3.2\bin;' (length=48) 
      'SHIM_MCCOMPAT' => string '0x810000001' (length=11) 
      'SystemDrive' => string 'C:' (length=2) 
      'SystemRoot' => string 'C:\Windows' (length=10) 
      'TEMP' => string 'C:\Users\j\AppData\Local\Temp' (length=29) 
      'TMP' => string 'C:\Users\j\AppData\Local\Temp' (length=29) 
      'USERDOMAIN' => string 'DESKTOP-CCCARJ6' (length=15) 
      'USERDOMAIN_ROAMINGPROFILE' => string 'DESKTOP-CCCARJ6' (length=15) 
      'USERNAME' => string 'j' (length=1) 
      'USERPROFILE' => string 'C:\Users\j' (length=10) 
      'windir' => string 'C:\Windows' (length=10) 
      'WXDRIVE_START_ARGS' => string '--wxdrive-setting=0 --disable-gpu --disable-software-rasterizer --enable-features=NetworkServiceInProcess' (length=105) 
      'HTTP_COOKIE' => string 'sugstore=0; baikeVisitId=8d420959-b540-4e7e-a145-9f73bdb16b13' (length=61) 
      'HTTP_ACCEPT_LANGUAGE' => string 'zh-CN,zh;q=0.9,en;q=0.8,en-GB;q=0.7,en-US;q=0.6' (length=47) 
      'HTTP_ACCEPT_ENCODING' => string 'gzip, deflate, br' (length=17) 
      'HTTP_SEC_FETCH_DEST' => string 'document' (length=8) 
      'HTTP_SEC_FETCH_USER' => string '?1' (length=2) 
      'HTTP_SEC_FETCH_MODE' => string 'navigate' (length=8) 
      'HTTP_SEC_FETCH_SITE' => string 'none' (length=4) 
      'HTTP_ACCEPT' => string 'text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7' (length=124) 
      'HTTP_USER_AGENT' => string 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36 Edg/120.0.0.0' (length=125) 
      'HTTP_UPGRADE_INSECURE_REQUESTS' => string '1' (length=1) 
      'HTTP_SEC_CH_UA_PLATFORM' => string '"Windows"' (length=9) 
      'HTTP_SEC_CH_UA_MOBILE' => string '?0' (length=2) 
      'HTTP_SEC_CH_UA' => string '"Not_A Brand";v="8", "Chromium";v="120", "Microsoft Edge";v="120"' (length=65) 
      'HTTP_CONNECTION' => string 'keep-alive' (length=10) 
      'HTTP_HOST' => string 'localhost' (length=9) 
      'REDIRECT_STATUS' => string '200' (length=3) 
      'SERVER_NAME' => string 'localhost' (length=9) 
      'SERVER_PORT' => string '80' (length=2) 
      'SERVER_ADDR' => string '127.0.0.1' (length=9) 
      'REMOTE_PORT' => string '63074' (length=5) 
      'REMOTE_ADDR' => string '127.0.0.1' (length=9) 
      'SERVER_SOFTWARE' => string 'nginx/1.15.11' (length=13) 
      'GATEWAY_INTERFACE' => string 'CGI/1.1' (length=7) 
      'REQUEST_SCHEME' => string 'http' (length=4) 
      'SERVER_PROTOCOL' => string 'HTTP/1.1' (length=8) 
      'DOCUMENT_ROOT' => string 'D:/phpstudy_pro/WWW' (length=19) 
      'DOCUMENT_URI' => string '/index2.php' (length=11) 
      'REQUEST_URI' => string '/index2.php' (length=11) 
      'SCRIPT_NAME' => string '/index2.php' (length=11) 
      'CONTENT_LENGTH' => string '' (length=0) 
      'CONTENT_TYPE' => string '' (length=0) 
      'REQUEST_METHOD' => string 'GET' (length=3) 
      'QUERY_STRING' => string '' (length=0) 
      'PATH_TRANSLATED' => string 'D:/phpstudy_pro/WWW' (length=19) 
      'PATH_INFO' => string '' (length=0) 
      'SCRIPT_FILENAME' => string 'D:/phpstudy_pro/WWW/index2.php' (length=30) 
      'FCGI_ROLE' => string 'RESPONDER' (length=9) 
      'PHP_SELF' => string '/index2.php' (length=11) 
      'REQUEST_TIME_FLOAT' => float 1702975573.7174
      'REQUEST_TIME' => int 1702975573
  '_ENV' => 
    array (size=0) 
      empty
  '_REQUEST' => 
    array (size=0) 
      empty
  'GLOBALS' => 


 & array< 




可以看出包含的有_GET、_POST、_COOKIE、_FILES、_SERVER、_ENV

_REQUEST、GLOBALS等数据。那么例如我们把get、cookie等添加数据是不

是也会在$GLOBALS中显示呢？如下图可以看到是可以的。那么$GLOBALS就是


这些全局函数的一个数据组，当然也可以自定义全局变量。

image.png

2.GLOBALS自定义全局变量的使用，如下图可以看到在函数外面定义变量GLOBALS自定义全局变量的使用，如下图可以看到在函数外面定义变量x

和y,在函数里面可以用y,在函数里面可以用GLOBALS调用相加获得全局变量$z.

image.png

image.png

3.global 声明全局,global声明后，给变量赋值，在php作用域内，再次声明

就可以使用了。

image.png

image.png

4.$_GET一般是url传参，或者method="get"传参

image.png

image.png

5.$_POST不显示在url中可以js的post、method="post"提交、或者curl的

post请求。

image.png

image.png

6.COOKIE和_COOKIE和_SESSION多用于用户身份的保存（网站的登录状态的判断）,

COOKIE的值可以在控制台看到（存储在客户端，不安全），_COOKIE的值可以在控制台看到（存储在客户端，不安全），_SESSION在控

制台看不到（存储在服务器端比较安全），

image.png

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7.$_FILES,存储文件信息

image.png

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8.REQUEST会接收到_REQUEST会接收到_GET和$_POST的数据（部分开源的框架会重写

$_REQUEST）

image.png

image.png

9.$_SERVER是包含头部信息、路径信息、脚本位置等信息的全局变量

image.png

image.png

10.$_ENY是服务器的环境变量的数组

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