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<!DOCTYPE html> <html> <body> <?php function get_cars($obj) { if (!is_object($obj)) { return false; } return $obj->cars; } $obj = new stdClass(); $obj->cars = array("Volvo", "BMW", "Audi"); var_dump(get_cars(null)); echo "<br>"; var_dump(get_cars($obj)); ?> </body> </html>