ReflectionParameter::isDefaultValueConstant()

(PHP 5 >= 5.4.6, PHP 7)

Returns whether the default value of this parameter is a constant

说明

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

参数

此函数没有参数。

返回值

ReturnsTRUEif the default value is constant,andFALSEotherwise.

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。

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.