Magic constants

<?

    // Set namespace (works only with PHP 5.3)
    namespace TestProject;

    // This prints file full path and name
    echo "This file full path and file name is '" . __FILE__ . "'.\n";

    // This prints file full path, without file name
    echo "This file full path is '" . __DIR__ . "'.\n";

    // This prints current line number on file
    echo "This is line number " . __LINE__ . ".\n";

    // Really simple basic test function
    function test_function_magic_constant() {
        echo "This is from '" . __FUNCTION__ . "' function.\n";
    }

    // Prints function and used namespace
    test_function_magic_constant();

    // Really simple class for testing magic constants
    class TestMagicConstants {
        // Prints class name
        public function printClassName() {
            echo "This is " . __CLASS__ . " class.\n";
        }

        // Prints class and method name
        public function printMethodName() {
            echo "This is " . __METHOD__ . " method.\n";
        }

        // Prints function name
        public function printFunction() {
            echo "This is function '" . __FUNCTION__ . "' inside class.\n";
        }

        // Prints namespace name (works only with PHP 5.3)
        public function printNamespace() {
            echo "Namespace name is '" . __NAMESPACE__ . "'.\n";
        }
    }

    // Create new TestMagicConstants class
    $test_magic_constants = new TestMagicConstants;

    // This prints class name and used namespace
    $test_magic_constants->printClassName();

    // This prints method name and used namespace
    $test_magic_constants->printMethodName();

    // This prints function name inside class and used namespace
    // same as method name, but without class
    $test_magic_constants->printFunction();

    // This prints namespace name (works only with PHP 5.3)
    $test_magic_constants->printNamespace();

?>