PHP ArrayIterator::offsetUnset方法代码示例

 /**
  * (PHP 5 &gt;= 5.0.0)<br/>
  * Unset value for an offset
  *
  * @link http://php.net/manual/en/arrayiterator.offsetunset.php
  *
  * @param string $index <p>
  *                      The offset to unset.
  *                      </p>
  *
  * @throws Exception\Collection When the collection has been marked as read-only
  */
 public function offsetUnset($index)
 {
     if ($this->isReadOnly() === true) {
         throw Exception\Collection::readOnly(get_class($this));
     }
     parent::offsetUnset($index);
 }

 private function clean(\ArrayIterator $files)
 {
     foreach ($files as $key => $value) {
         if (is_null($value[0])) {
             $files->offsetUnset($key);
             continue;
         }
     }
     return $files;
 }

 public function offsetUnset($name)
 {
     if (!is_array($name)) {
         return parent::offsetUnset($name);
     } else {
         $key = array_shift($name);
         if (sizeof($name) == 0) {
             return parent::offsetUnset($key);
         } else {
             if (parent::offsetExists($key)) {
                 $object = parent::offsetGet($key);
                 if (is_a($object, 'MutliDimArray')) {
                     $object->offsetUnset($name);
                     if ($object->sizeof() == 0) {
                         parent::offsetUnset($key);
                     }
                 } else {
                     parent::offsetUnset($key);
                 }
             }
         }
     }
 }

 /**
  * Unset values from an offset or offsets
  *
  * @param string|array $index Offsets to remove
  *
  * @return Collection
  */
 public function offsetUnset($index)
 {
     $index = is_array($index) ? $index : (array) $index;
     foreach ($index as $key) {
         parent::offsetUnset($key);
     }
     return $this;
 }

 public function offsetUnset($index)
 {
     $this->collection->offsetUnset($index);
     parent::offsetUnset($index);
     $this->refreshPositions();
 }

 /**
  * Unset value at offset
  * 
  * @param string $index
  */
 public function offsetUnset($index)
 {
     parent::offsetExists($index) && parent::offsetUnset($index);
 }

 /**
  */
 public function offsetUnset($offset)
 {
     if (!is_null($offset = $this->_getRealOffset($offset))) {
         parent::offsetUnset($offset);
     }
 }

 /**
  * \WP_Widget::update_callback(): unset($all_instances[$number]);
  * \WP_Widget::get_settings(): unset($settings['_multiwidget'], $settings['__i__']);
  *
  * @param int|string $key Array key.
  */
 public function offsetUnset($key)
 {
     if ('_multiwidget' === $key || '__i__' === $key) {
         return;
     }
     $key = filter_var($key, FILTER_VALIDATE_INT);
     if ($key < 2) {
         return;
     }
     $this->unset_widget_numbers[] = $key;
     parent::offsetUnset($key);
 }

 public function offsetUnset($k)
 {
     return parent::offsetUnset($this->normalize($k));
 }

<?php

$object = new ArrayIterator();
$object->append(1);
foreach ($object as $key => $value) {
    $object->offsetUnset($key);
}
?>
===DONE===

 /**
  * Offset to unset
  * @param string $offset
  * @return void
  * @throws CollectionException
  */
 public function offsetUnset($offset)
 {
     $this->specsIterator->offsetUnset($offset);
 }

 /**
  * @param mixed|string $index
  *
  * @author Yohann Marillet
  */
 public function offsetUnset($index)
 {
     $offset = $this->getKey($index);
     parent::offsetUnset($offset);
 }

try {
    $object = new ArrayIterator($array);
    // 判断第二个节点是否存在
    if ($object->offsetExists(2)) {
        // 给第二个节点赋新值
        $object->offsetSet(2, 'value2_1');
    }
    // 在数组最后插入新值
    $object->append('value_6');
    // 自然排序排序 natsort(): 数组进行自然排序; natcasesort():对数组进行自然排序，并不区分大小写
    // uasort(): uksort(): 通过在参数中传递已定义的排序方式进行排序；
    $object->natsort();
    // 检查key为3所对应的值
    $object->offsetGet(3);
    // 销毁key为3的值
    $object->offsetUnset(3);
    // 指针跳转到第5个节点
    $object->seek(4);
    // foreach 循环
    /**
     * 如下的写法经调试出现了一个bug。
     * 当在循环中进行offsetUnset时，此时，当前指针会回跳会第一个节点，即$object->key()的值为0，但是此时循环的key值和value值并没有变，依然是3=>value4。
     * 而再次foreach循环之前，$object->key()值为0.循环后，$object->key()为1，所有，此时循环重复值。
     */
    foreach ($object as $key => $value) {
        echo '<li>' . $key . '=>' . $value . '</li>' . "\n";
    }
    // while 循环
    $object->rewind();
    while ($object->valid()) {
        echo $object->current();

 public function offsetUnset($offset)
 {
     $name = $this->_normalizeHeaderName($offset);
     unset($this->_fields[$name]);
     parent::offsetUnset($name);
 }