get_cfg_var()

(PHP 4, PHP 5, PHP 7)

获取 PHP 配置选项的值

说明

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。

参数

配置选项的名称。

返回值

返回$option指定的当前 PHP 配置变量的值，错误发生时返回FALSE。

更新日志

参见

• ini_get() 获取一个配置选项的值
• ini_get_all() 获取所有配置选项

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'.

I had my setting = yes and then checked it as ==="yes" for epic fail.

keep in mind get_cfg_var() returns a string(1) '1' for the value: On 

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

Regarding the statement by the earlier poster that:
"Unfortunately, you almost never want to know the original value in the config file. Instead, you want to know the value currently in effect."
I have found this useful for changing the error reporting levels for a few specific pages while testing. I turn on all error_reporting while testing, but for a few pages I want to turn off notices. So, I put this at the top of the page:

and this at the bottom:

to put it back to whatever default I had at the time.

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