# ArrayObject::setFlags

(PHP 5 >= 5.1.0, PHP 7, PHP 8)

ArrayObject::setFlags — Sets the behavior flags

### 说明

public ArrayObject::setFlags(int `$flags`): void

Set the flags that change the behavior of the ArrayObject.

### 参数

`flags`

  The new ArrayObject behavior. It takes on either a bitmask, or named constants. Using named constants is strongly encouraged to ensure compatibility for future versions.

  The available behavior flags are listed below. The actual meanings of these flags are described in the predefined constants.

  ArrayObject behavior flags
  value | constant
  --- | ---
  1 | ArrayObject::STD_PROP_LIST
  2 | ArrayObject::ARRAY_AS_PROPS

### 返回值

没有返回值。

### 示例

示例 #1 ArrayObject::setFlags() example

`<?php
// Array of available fruits
$fruits = array("lemons" => 1, "oranges" => 4, "bananas" => 5, "apples" => 10);
$fruitsArrayObject = new ArrayObject($fruits);
// Try to use array key as property
var_dump($fruitsArrayObject->lemons);
// Set the flag so that the array keys can be used as properties of the ArrayObject
$fruitsArrayObject->setFlags(ArrayObject::ARRAY_AS_PROPS);
// Try it again
var_dump($fruitsArrayObject->lemons);
?>`

以上示例的输出类似于：

    Warning: Undefined property: ArrayObject::$lemons in ...
    NULL
    int(1)

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