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<!DOCTYPE html> <html> <body> <?php abstract class ParentClass { // Abstract method with an argument abstract protected function prefixName($name); } class ChildClass extends ParentClass { // The child class may define optional arguments that is not in the parent's abstract method public function prefixName($name, $separator = ".", $greet = "Dear") { if ($name == "John Doe") { $prefix = "Mr"; } elseif ($name == "Jane Doe") { $prefix = "Mrs"; } else { $prefix = ""; } return "{$greet} {$prefix}{$separator} {$name}"; } } $class = new ChildClass; echo $class->prefixName("John Doe"); echo "<br>"; echo $class->prefixName("Jane Doe"); ?> </body> </html>
尊敬的 John Doe 先生：
尊敬的 Jane Doe 女士：
