ArrayObject::offsetSet()

(PHP 5, PHP 7)

为指定索引设定新的值

说明

publicArrayObject::offsetSet(mixed $index, mixed $newval): void

设置指定的索引为新的值

参数

$index: 将要被设置的索引
$newval: 参数$index所对应的新值。

返回值

没有返回值。

范例

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);
?>

以上例程会输出：

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。

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

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
        )
    )
)