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<?php namespace Bar { const BAR_E_ERROR = 42; function foo($value = E_ERROR) {} function bar($value = \E_ERROR) {} function baz($value = BAR_E_ERROR) {} } namespace { function foo($value = E_ERROR) {} error_reporting(E_ALL); $list = array('foo', 'Bar\foo', 'Bar\bar', 'Bar\baz'); foreach ($list as $functionName) { $ref = new ReflectionParameter($functionName, 'value'); echo "Checking parameter for $functionName", PHP_EOL; var_dump($ref->getDefaultValueConstantName(), $ref->getDefaultValue()); echo PHP_EOL; } }