PHP——超全局变量_学习笔记 php application 全局变量 php 全局静态变量 php全局变量赋

什么是超全局变量

PHP 中的许多预定义变量都是“超全局的”，这意味着它们在一个脚本的全部作用域中都可用。在函数或方法中无需执行 global $variable; 就可以访问它们。

$_SERVER//查看服务器信息$_GET//地址栏参数$_POST//表单提交的值$_REQUEST//接受$_GET或$_POST的值$_FILES//文件上传$_COOKIE//跟踪用户状态$_SESSION//跟踪用户状态$GLOBALS//获取所有全局变量的值

$_SERVER:
可以查看服务器的信息，里面保存关于报头、路径和脚本位置的信息。
下面打印出来看下：

print_r($_SERVER);
?>

结果如下：

Array
(
    [HTTP_HOST] => localhost
    [HTTP_CONNECTION] => keep-alive
    [HTTP_CACHE_CONTROL] => max-age=0
    [HTTP_ACCEPT] => text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
    [HTTP_UPGRADE_INSECURE_REQUESTS] =>1
    [HTTP_USER_AGENT] => Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/48.0.2564.116 UBrowser/5.6.11466.7 Safari/537.36
    [HTTP_REFERER] =>http://localhost/PHP/php7/
    [HTTP_ACCEPT_ENCODING] => gzip, deflate
    [HTTP_ACCEPT_LANGUAGE] => zh-CN,zh;q=0.8
    [PATH] =>C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;
    [SystemRoot] =>C:\Windows
    [COMSPEC] =>C:\Windows\system32\cmd.exe
    [PATHEXT] => .COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH;.MSC
    [WINDIR] =>C:\Windows
    [SERVER_SIGNATURE] => 
Apache/2.4.9 (Win64) PHP/5.5.12 Server at localhost Port 80


    [SERVER_SOFTWARE] => Apache/2.4.9 (Win64) PHP/5.5.12
    [SERVER_NAME] => localhost
    [SERVER_ADDR] => ::1
    [SERVER_PORT] =>80
    [REMOTE_ADDR] => ::1
    [DOCUMENT_ROOT] =>D:/www/
    [REQUEST_SCHEME] => http
    [CONTEXT_PREFIX] =>    [CONTEXT_DOCUMENT_ROOT] =>D:/www/
    [SERVER_ADMIN] => [e-mail]
    [SCRIPT_FILENAME] =>D:/www/PHP/php7/demo.php
    [REMOTE_PORT] =>52683
    [GATEWAY_INTERFACE] => CGI/1.1
    [SERVER_PROTOCOL] => HTTP/1.1
    [REQUEST_METHOD] => GET
    [QUERY_STRING] =>    [REQUEST_URI] => /PHP/php7/demo.php
    [SCRIPT_NAME] => /PHP/php7/demo.php
    [PHP_SELF] => /PHP/php7/demo.php
    [REQUEST_TIME_FLOAT] =>1460548562.994
    [REQUEST_TIME] =>1460548562
)

').addClass('pre-numbering').hide(); $(this).addClass('has-numbering').parent().append($numbering); for (i = 1; i ').text(i)); }; $numbering.fadeIn(1700); }); });

以上就介绍了PHP——超全局变量_学习笔记，包括了全局变量,php方面的内容，希望对PHP教程有兴趣的朋友有所帮助。