ini_restore()

(PHP 4, PHP 5, PHP 7)

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 #1ini_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

• ini_get() 获取一个配置选项的值
• ini_get_all() 获取所有配置选项
• ini_set() 为一个配置选项设置值

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;
}
?>