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ArrayIterator::offsetUnset

(PHP 5, PHP 7)

ArrayIterator::offsetUnsetオフセットの値を削除する

説明

public ArrayIterator::offsetUnset ( string $index ) : void

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。

参考

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User Contributed Notes 3 notes

up
2
olav at fwt dot no
8 years ago
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
up
1
rkos...
5 years ago
This is my solution for problem with offsetUnset
<?php

$a
= new ArrayObject( range( 0,9 ) );
$b = new ArrayIterator( $a );

for (
$b->rewind(); $b->valid();  )
{
    echo
"#{$b->key()} - {$b->current()} - <br>\r\n";
    if(
$b->key()==0 || $b->key()==1){
       
$b->offsetUnset( $b->key() );
    }else {
       
$b->next();
    }
}

var_dump($b);
?>
up
0
Adil Baig @ AIdezigns
8 years ago
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.
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