ReflectionParameter::getDefaultValue

Gets default parameter value

&reftitle.description; public `mixed` `ReflectionParameter::getDefaultValue`

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.

&reftitle.parameters; &no.function.parameters;
&reftitle.returnvalues;

The parameters default value.

&reftitle.changelog;

&Version; | &Description;
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.

&reftitle.examples;

### Getting default values of function parameters

    <?php
    function 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;
    }
    ?>

&example.outputs;

    Name: test

    Name: bar
    Default value: baz

&reftitle.seealso;

- `ReflectionParameter::isOptional`
- `ReflectionParameter::isDefaultValueAvailable`
- `ReflectionParameter::getDefaultValueConstantName`
- `ReflectionParameter::isPassedByReference`