get_cfg_var()
(PHP 4, PHP 5, PHP 7)
获取 PHP 配置选项的值
说明
get_cfg_var(string $option): string
获取 PHP 配置选项$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
- $option
配置选项的名称。
返回值
返回$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
版本 | 说明 |
---|---|
5.3.0 | get_cfg_var()被修复,能够返回"array"的 ini 选项。 |
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'. <?php //#my ini file //A = 1 //B = any-thing //C = yes //D = /some/path/file get_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.
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
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: <?php error_reporting(8183); ?> and this at the bottom: <?php error_reporting(get_cfg_var('error_reporting')); ?> to put it back to whatever default I had at the time.