ReflectionParameter::getDefaultValueConstantName
Returns the default value's constant name if default value is constant or null
&reftitle.description;
public stringReflectionParameter::getDefaultValueConstantName
Returns the default value's constant name of the parameter of a user-defined
function or method, if default value is constant or null.
If the parameter is not optional a ReflectionException
will be thrown.
&reftitle.parameters;
&no.function.parameters;
&reftitle.returnvalues;
Returns string on success or &null; on failure.
&reftitle.examples;
Getting default values' constant names of function parameters
getParameters() as $param) {
echo 'Name: ' . $param->getName() . PHP_EOL;
if ($param->isOptional()) {
echo 'Default value: ' . $param->getDefaultValueConstantName() . PHP_EOL;
}
echo PHP_EOL;
}
?>
]]>
&example.outputs;
&reftitle.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.
&reftitle.seealso;
ReflectionParameter::isOptional
ReflectionParameter::isDefaultValueConstant
ReflectionParameter::getDefaultValue