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<!DOCTYPE html> <html> <body> <?php abstract class ParentClass { // 带有参数的抽象方法 abstract protected function prefixName($name); } class ChildClass extends ParentClass { public function prefixName($name) { if ($name == "Bill Gates") { $prefix = "Mr."; } elseif ($name == "Jane Doe") { $prefix = "Mrs."; } else { $prefix = ""; } return "{$prefix} {$name}"; } } $class = new ChildClass; echo $class->prefixName("Bill Gates"); echo "<br>"; echo $class->prefixName("Jane Doe"); ?> </body> </html>