PHP - Manual: get_cfg_var

2024-11-15

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get_cfg_var

(PHP 4, PHP 5, PHP 7, PHP 8)

get_cfg_var — 获取 PHP 配置选项的值

说明

get_cfg_var(string $option): mixed

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

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User Contributed Notes 6 notes

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surfchen at gmail dot com ¶

15 years ago


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.]

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gabriel b ¶

9 years ago


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.

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tbrix13 at uzitech dot com ¶

7 years ago


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
?>

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techno dot rahul1988 at gmail dot com ¶

8 years ago


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

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sinus at sinpi dot net ¶

2 years ago


Boolean-like values are evaluated as follows: "true", "on", "yes" evaluate to "1" (string 1), while "false", "off", "no" evaluate to "" (empty string).

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-8

Stephen ¶

15 years ago


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.

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官方地址：https://www.php.net/manual/en/function.get-cfg-var.php

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get_cfg_var

说明

参数

返回值

更新日志

参见

User Contributed Notes 6 notes