ini_restore

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

ini_restore — 恢复配置选项的值

说明

ini_restore ( string $varname ) : void

恢复指定的配置选项到它的原始值。

参数

varname

配置选项名称。

返回值

没有返回值。

范例

Example #1 ini_restore() 例子

<?php
$setting = 'y2k_compliance';

echo 'Current value for \'' . $setting . '\': ' . ini_get($setting), PHP_EOL;

ini_set($setting, ini_get($setting) ? 0 : 1);
echo 'New value for \'' . $setting . '\': ' . ini_get($setting), PHP_EOL;

ini_restore($setting);
echo 'Original value for \'' . $setting . '\': ' . ini_get($setting), PHP_EOL;
?>

以上例程会输出：

Current value for 'y2k_compliance': 1
New value for 'y2k_compliance': 0
Original value for 'y2k_compliance': 1

参见

User Contributed Notes

Anonymous 11-Jan-2016 02:08
If like me you thought ini_restore() would restore to the most recent setting rather than the startup value, you could use this.

<?php

/**
 * Executes a function using a custom PHP configuration.
 *
 * @param array $settings A map<ini setting name, ini setting value>.
 * @param callable $doThis The code to execute using the given settings.
 * @return mixed Returns the value returned by the given callable.
 */
function ini_using_do(array $settings, callable $doThis){
    foreach($settings as $name => $value){
        $previousSettings[$name] = ini_set($name, $value);
    }
    $returnValue = $doThis();
    if(isset($previousSettings)){
        foreach($previousSettings as $name => $value){
            ini_set($name, $value);
        }
    }
    return $returnValue;
}

?>