ArrayIterator::offsetSet
When unsetting elements as you go it will not remove the second index of the Array being worked on. Im not sure exactly why but there is some speculations that when calling unsetOffset(); it resets the pointer aswell.
<?php
$a = new ArrayObject( range( 0,9 ) );
$b = new ArrayIterator( $a );
for ( $b->rewind(); $b->valid(); $b->next() )
{
echo "#{$b->key()} - {$b->current()} - \r\n";
$b->offsetUnset( $b->key() );
}
?>
To avoid this bug you can call offsetUnset in the for loop
<?php
/*** ... ***/
for ( $b->rewind(); $b->valid(); $b->offsetUnset( $b->key() ) )
{
/*** ... ***/
?>
Or unset it directly in the ArrayObject
<?php
/*** ... ***/
$a->offsetUnset( $b->key() );
/*** ... ***/
?>
which will produce correct results
ArrayIterator::offsetUnset
(PHP 5 >= 5.0.0)
ArrayIterator::offsetUnset — オフセットの値を削除する
説明
public void ArrayIterator::offsetUnset
( string
$index
)オフセットの値を削除します。
警告
この関数は、 現在のところ詳細な情報はありません。引数のリストのみが 記述されています。
パラメータ
-
index -
削除したいオフセット。
返り値
値を返しません。
add a note
User Contributed Notes
ArrayIterator::offsetUnset
olav at fwt dot no
07-Jul-2011 04:12
Adil Baig @ AIdezigns
23-Jun-2011 11:23
Make sure you use this function to unset a value. You can't access this iterator's values as an array. Ex:
<?php
$iterator = new RecursiveIteratorIterator(new RecursiveArrayIterator($arr));
foreach($iterator as $key => $value)
{
unset($iterator[$key]);
}
?>
Will return :
PHP Fatal error: Cannot use object of type RecursiveIteratorIterator as array
offsetUnset works properly even when removing items from nested arrays.