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# ini_get

(PHP 4, PHP 5)

ini_get -- Gets the value of a configuration option

## 说明

string ini_get ( string varname )

Returns the value of the configuration option on success.

## 参数

`varname`

  The configuration option name.

## 返回值

Returns the value of the configuration option as a string on success, or an empty string on failure.

## 范例

例 1. A few ini_get() examples

`<?php
/*
Our php.ini contains the following settings:
display_errors = On
register_globals = Off
post_max_size = 8M
*/
echo 'display_errors = ' . ini_get('display_errors') . "\n";
echo 'register_globals = ' . ini_get('register_globals') . "\n";
echo 'post_max_size = ' . ini_get('post_max_size') . "\n";
echo 'post_max_size+1 = ' . (ini_get('post_max_size')+1) . "\n";
echo 'post_max_size in bytes = ' . return_bytes(ini_get('post_max_size'));
function return_bytes($val) {
$val = trim($val);
$last = strtolower($val{strlen($val)-1});
switch($last) {
// The 'G' modifier is available since PHP 5.1.0
case 'g':
$val *= 1024;
case 'm':
$val *= 1024;
case 'k':
$val *= 1024;
}
return $val;
}
?>`

上例的输出类似于：

    display_errors = 1
    register_globals = 0
    post_max_size = 8M
    post_max_size+1 = 9
    post_max_size in bytes = 8388608

## 注释

> When querying boolean values: A boolean ini value of `off` will be returned as an empty string or "0" while a boolean ini value of `on` will be returned as "1".

> When querying memory size values: Many ini memory size values, such as upload_max_filesize, are stored in the `php.ini` file in shorthand notation. ini_get() will return the exact string stored in the `php.ini` file and NOT its integer equivalent. Attempting normal arithmetic functions on these values will not have otherwise expected results. The example below shows one way to convert shorthand notation into bytes, much like how the PHP source does it.

## 参见

get_cfg_var()
ini_get_all()
ini_restore()
ini_set()

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