ReflectionParameter::getDefaultValue

(PHP 5 >= 5.0.3, PHP 7)

Gets default parameter value

public mixed ReflectionParameter::getDefaultValue ( void )

Gets the default value of the parameter for a user-defined function or method. If the parameter is not optional a ReflectionException will be thrown.

Returns:

The parameters default value.

Notes:

Due to implementation details, it is not possible to get the default value of built-in functions or methods of built-in classes. Trying to do this will result a ReflectionException being thrown.

Examples:

Getting

<?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;
}
?>

The above example will output:

Name: test

Name: bar
Default value: baz