Unsets the value at the specified index

# ArrayObject::offsetUnset

(PHP 5, PHP 7, PHP 8)

ArrayObject::offsetUnset — Unsets the value at the specified index

### 说明

public function ArrayObject::offsetUnset(mixed `$key`): void

Unsets the value at the specified index.

### 参数

`key`

  The index being unset.

### 返回值

没有返回值。

### 示例

示例 #1 ArrayObject::offsetUnset() example

    <?php
    $arrayobj = new ArrayObject(array(0=>'zero',2=>'two'));
    $arrayobj->offsetUnset(2);
    var_dump($arrayobj);
    ?>

以上示例会输出：

    object(ArrayObject)#1 (1) {
      ["storage":"ArrayObject":private]=>
      array(1) {
        [0]=>
        string(4) "zero"
      }
    }

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