ReflectionParameter::isDefaultValueConstant

(PHP 5 >= 5.4.6, PHP 7)

ReflectionParameter::isDefaultValueConstant — Returns whether the default value of this parameter is a constant

说明

public ReflectionParameter::isDefaultValueConstant ( void ) : bool

Returns whether the default value of this parameter is a constant.

参数

此函数没有参数。

返回值

Returns TRUE if the default value is constant, and FALSE otherwise.

参见

ReflectionParameter::getDefaultValueConstantName() - Returns the default value's constant name if default value is constant or null
ReflectionParameter::isDefaultValueAvailable() - 检查是否有默认值。

User Contributed Notes

kristianoye at gmail dot com 25-May-2015 09:39


This method returns true only if the parameter's default value is set to a named constant.  e.g.



class Foo {

   const OPTION_MULTIGET = 1;



   //Method 1

   public function setGetOptions($opts=0);



   //Method 2

   public function setMultiGetOptions($opts=Foo::OPTION_MULTIGET);

}



Method 1's first ReflectionParameter will return isDefaultValueConstant() = false (0 is a "constant"/static value but not a named constant) and Method 2's will return isDefaultValueConsntant() = true.