php 多继承的几种常见实现方法示例

本文实例讲述了php 多继承的几种常见实现方法。分享给大家供大家参考，具体如下：

class parent1 {
  function method1() {}
  function method2() {}
}
class parent2 {
  function method3() {}
  function method4() {}
}
class child {
  protected $_parents = array();
  public function child(array $parents=array()) {
    $this->_parents = $parents;
  }
  public function __call($method, $args) {
    // 从“父类"中查找方法
    foreach ($this->_parents as $p) {
      if (is_callable(array($p, $method))) {
        return call_user_func_array(array($p, $method), $args);
      }
    }
    // 恢复默认的行为，会引发一个方法不存在的致命错误
    return call_user_func_array(array($this, $method), $args);
  }
}
$obj = new child(array(new parent1(), new parent2()));
print_r( array($obj) );die;
$obj->method1();
$obj->method3();

运行结果：

array
(
    [0] => child object
        (
            [_parents:protected] => array
                (
                    [0] => parent1 object
                        (
                        )

                    [1] => parent2 object
                        (
                        )

                )

        )

)

interface testa{
  function echostr();
}
interface testb extends testa{
  function dancing($name);
}
class testc implements testb{
  function echostr(){
    echo "接口继承，要实现所有相关抽象方法！";
    echo "<br>";
  }
  function dancing($name){
    echo $name."正在跳舞！";
  }
}
$demo=new testc();
$demo->echostr();
$demo->dancing("模特");

运行结果：

接口继承，要实现所有相关抽象方法！
模特正在跳舞！