ArrayObject::offsetUnset()

(PHP 5, PHP 7)

Unsets the value at the specified index

说明

Unsets the value at the specified index.

参数

The index being unset.

返回值

没有返回值。

范例

ArrayObject::offsetUnset() example

以上例程会输出：

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

When traversing recursively nested arrays using an RecursiveIteratorIterator, you cannot offsetUnset() or offsetSet() sub-array values, unless they are *all* declared as ArrayObject.

Be careful when you are working with collections. This method works with the reference of an array instead of its retrieved value.
So, you can do a mistake.
In order to understand have a look at code as follow: 

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