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日期作为任择参数(对“现在”的过失,不作废)?
原标题:DateTime as optional parameter (default to "now", not null)?

Is possible to set a DateTime object as optional parameter using now as default?

下面的法典给我一个syntax差错:

public function getData(array $metrics, DateTime $start,
    DateTime $end = new DateTime, $params = array())
{
    // Default DateTime constructor automatically use "now"
}

它只是一个好奇的问题,i 知道一能够做到:

public function getData(array $metrics, DateTime $start,
    DateTime $end = null, $params = array())
{
    $end = is_null($end) ? new DateTime() : null;
}
最佳回答

您不能将物体设定为违约功能/方法参数。 http://php.net/manual/Functions.arguments.php#Functions.arguments.default' rel=“noreferer”文件:

Default argument values
A function may define C++-style default values for scalar arguments ...

物体不是“http://www. . . . net/manual/English.types.intro.org” rel=“noreferer”>scalar datatype

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