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ArrayObject::offsetSet

(PHP 5, PHP 7, PHP 8)

ArrayObject::offsetSet — 为指定索引设定新值

说明

public ArrayObject::offsetSet(mixed $key, mixed $value): void

设置指定的索引为新值。

参数

key: 将要被设置的索引。
value: 参数 key 所对应的新值。

返回值

没有返回值。

示例

示例 #1 ArrayObject::offsetSet() 例子

<?php
class Example {
    public $property = 'prop:public';
}
$arrayobj = new ArrayObject(new Example());
$arrayobj->offsetSet(4, 'four');
$arrayobj->offsetSet('group', array('g1', 'g2'));
var_dump($arrayobj);

$arrayobj = new ArrayObject(array('zero','one'));
$arrayobj->offsetSet(null, 'last');
var_dump($arrayobj);
?>

以上示例会输出：

 
object(ArrayObject)#1 (3) {
  ["property"]=>
  string(11) "prop:public"
  [4]=>
  string(4) "four"
  ["group"]=>
  array(2) {
    [0]=>
    string(2) "g1"
    [1]=>
    string(2) "g2"
  }
}
object(ArrayObject)#3 (3) {
  [0]=>
  string(4) "zero"
  [1]=>
  string(3) "one"
  [2]=>
  string(4) "last"
}

参见

ArrayObject::append() - 追加新的值作为最后一个元素。

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User Contributed Notes 2 notes

down

jerikojerk ¶

12 years ago

On my php 5.3.5 installation, i discovered that value can be set by reference and not by copy ... depending the context..

so this is différent from what a regular array() 

<?php

function set(&$x, &$a )
{
    $x[] = $a;
}

$x = new ArrayObject();
$y = array();
$z = new ArrayObject();

$a =  array( 'foo' );
set($y,$a);
set($x,$a);
$z[]=$a;

$a = array( 'bar');

set($x,$a);
set($y,$a);
$z[]=$a;

print_r($x);
print_r($y);
print_r($z);
?>

// output 
ArrayObject Object
(
    [storage:ArrayObject:private] => Array
        (
            [0] => Array
                (
                    [0] => bar
                )

            [1] => Array
                (
                    [0] => bar
                )

        )

)
Array
(
    [0] => Array
        (
            [0] => foo
        )

    [1] => Array
        (
            [0] => bar
        )

)
ArrayObject Object
(
    [storage:ArrayObject:private] => Array
        (
            [0] => Array
                (
                    [0] => bar
                )

            [1] => Array
                (
                    [0] => bar
                )

        )

)

down

n dot lenepveu at gmail dot com ¶

15 years ago

If $index is null, $newval is naturally pushed onto the end of the array as ArrayObject::append

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