ReflectionParameter::isDefaultValueConstant

(PHP 5 >= 5.4.6, PHP 7, PHP 8)

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

说明

public ReflectionParameter::isDefaultValueConstant(): 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() - 检查默认是否可用

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kristianoye at gmail dot com ¶

9 years ago

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.