ArrayIterator::offsetUnset

(PHP 5 >= 5.0.0, PHP 7)

ArrayIterator::offsetUnsetUnset value for an offset

Beschreibung

public void ArrayIterator::offsetUnset ( string $index )

Unsets a value for an offset.

Warnung

Diese Funktion ist bis jetzt nicht dokumentiert. Es steht nur die Liste der Argumente zur Verfügung.

Parameter-Liste

index

The offset to unset.

Rückgabewerte

Es wird kein Wert zurückgegeben.

Siehe auch

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User Contributed Notes 3 notes

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1
rkos...
3 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);
?>
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1
olav at fwt dot no
6 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
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0
Adil Baig @ AIdezigns
6 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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