Php/docs/reflectionparameter.getdefaultvalue
ReflectionParameter::getDefaultValue
(PHP 5 >= 5.0.3, PHP 7)
ReflectionParameter::getDefaultValue — Gets default parameter value
说明
public ReflectionParameter::getDefaultValue ( ) : mixed
Gets the default value of the parameter for any user-defined or internal function or method. If the parameter is not optional a ReflectionException will be thrown.
参数
此函数没有参数。
返回值
The parameters default value.
更新日志
版本 | 说明 |
---|---|
8.0.0 | This method now allows getting the default value of parameters of built-in functions and
built-in class methods. Previously, a ReflectionException was thrown. |
范例
Example #1 Getting default values of function parameters
<?phpfunction foo($test, $bar = 'baz'){ echo $test . $bar;}$function = new ReflectionFunction('foo');foreach ($function->getParameters() as $param) { echo 'Name: ' . $param->getName() . PHP_EOL; if ($param->isOptional()) { echo 'Default value: ' . $param->getDefaultValue() . PHP_EOL; } echo PHP_EOL;}?>
以上例程会输出:
Name: test Name: bar Default value: baz
参见
- ReflectionParameter::isOptional() - Checks if optional
- ReflectionParameter::isDefaultValueAvailable() - 检查是否有默认值。
- ReflectionParameter::getDefaultValueConstantName() - Returns the default value's constant name if default value is constant or null
- ReflectionParameter::isPassedByReference() - Checks if passed by reference