(PHP 4, PHP 5, PHP 7, PHP 8)
get_cfg_var — 获取 PHP 配置选项的值
获取 PHP 配置选项 option 的值。
此函数不会返回 PHP 编译的配置信息，或从 Apache 配置文件读取。
检查系统是否使用了一个配置文件，并尝试获取 cfg_file_path 的配置设置的值。如果有效，将会使用一个配置文件。
option配置选项的名称。
返回 option 指定的当前 PHP 配置变量的值，错误发生时返回 false。
get_cfg_var returns the value from php.ini directly,while the ini_get returns the runtime config value. I have tried it on PHP 5.1.6
[EDIT by danbrown AT php DOT net: The author of this note means that ini_get() will return values set by ini_set(), .htaccess, a local php.ini file, and other functions at runtime. Conversely, get_cfg_var() will return strictly the server php.ini.]settings with the value of 'yes' will be returned as '1'.<?php//#my ini file//A = 1//B = any-thing//C = yes//D = /some/path/fileget_cfg_var('A') // returns '1'get_cfg_var('B') // returns 'any-thing'get_cfg_var('C') // returns '1', wait, why?get_cfg_var('D') // returns '/some/path/file'?>I had my setting = yes and then checked it as ==="yes" for epic fail.Boolean-like values are evaluated as follows: "true", "on", "yes" evaluate to "1" (string 1), while "false", "off", "no" evaluate to "" (empty string).keep in mind get_cfg_var() returns a string(1) '1' for the value: On<?php//in php.ini//A = On$A1 = get_cfg_var("A") === "On";$A2 = get_cfg_var("A") === 1;$A3 = get_cfg_var("A") === "1";//$A1 is false//$A2 is false//$A3 is true?>The difference between ini_get() and get_cfg_var() is as follows:@) ini_get(): returns the current value in .htaccess or as defined in PHP_INI_USER or PHP_INI_PERDIR@) get_cfg_var: returns the values defined in the php.ini