echo '$class 是MyClass类的实例对象'; } echo "<hr/>"; //clone 关键词 $p1 = new person("张三", "男", "88"); $p2 = clone $p1; $p1->name = "王麻子"; echo "<br/>"; echo $p1->name; echo $p2->name; echo "<hr/>"; //魔术方法 __toString() ————让 'echo $p1'不报错 echo $p1; echo "<hr/>"; //魔术方法 __call() $p1->run(); echo '<br/>'; $p1->say('爬', '开'); class DB { private $sql = array("field" => "", "where" => "", "order" => "", "limit" => "", "group" => "", "having" => ""); function __call($DBName, $args) { $DBName = strtolower($DBName); if (array_key_exists($DBName, $this->sql)) { $this->sql[$DBName] = $args[0]; } else { echo '你调用的' . get_class($this) . '中的方法' . $DBName . '不存在!'; } return $this; }