使用 instanceof 检查和修改输入

Question

我正在使用instanceof 检查类实例，如果类已经有具有相同数据的实例，我想修改输入数据。下面的示例详细演示了我的问题，其中我有两个唯一的数组输入，第三个是第二个重复数组，instanceof 应该可以工作和修改输入。

/**
 * Foo Class
 */
class Foo {
  public $bar = array();
  public function __construct() {}

  public function add( $bar ) {
    if ( $bar['ID'] instanceof Baz ) { // inctanceof not working as i am expecting. supposed to modify duplicate occurrence 

      //if bar['ID'] is already instance of Baz then we are trying to modify bar ID before pass it so Baz.
      $bar['ID'] = $bar['ID'] . rand();
      $this->bar[ $bar['ID'] ] = new Baz( $bar );
    }
    else {
      $this->bar[ $bar['ID'] ] = new Baz( $bar );
    }
  }
}

类巴兹

/**
 * Class Baz
 */
class Baz {
  public $ID;
  public function __construct( $bar ) {
    $this->ID = $bar['ID'];
  }
}

实例

$foo = new Foo();

$bar = array( 'ID'  => 'bar1' );
$foo->add( $bar );

$bar2 = array( 'ID'  => 'bar2' );
$foo->add( $bar2 );

$bar3 = array( 'ID'  => 'bar2' ); //duplicate ID
$foo->add( $bar3 );

打印

print_r( $foo );

输出

Foo Object
(
    [bar] => Array
        (
            [bar1] => Baz Object
                (
                    [ID] => bar1
                )

            [bar2] => Baz Object
                (
                    [ID] => bar2
                )

        )

)

预期输出

Foo Object
(
    [bar] => Array
        (
            [bar1] => Baz Object
                (
                    [ID] => bar1
                )

            [bar2] => Baz Object
                (
                    [ID] => bar2
                )
            [bar2{random number}] => Baz Object
                (
                    [ID] => bar2{random number}
                )

        )

)

我在这里做错了什么？请指导我，替代解决方案也适用。

Answer 1

你的 Foo 类应该是这样的：

class Foo {
  public $bar = array();
  public function __construct() {}

  public function add( $bar ) {
    if (isset($this->bar[ $bar['ID'] ]) && $this->bar[ $bar['ID'] ] instanceof Baz ) { // inctanceof not working as i am expecting. supposed to modify duplicate occurrence 

      //if bar['ID'] is already instance of Baz then we are trying to modify bar ID before pass it so Baz.
      $bar['ID'] = $bar['ID'] . rand();
      $this->bar[$bar['ID']]= new Baz( $bar );
    }
    else {
      $this->bar[ $bar['ID'] ] = new Baz( $bar );
    }
  }
}