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, PHP 7)
ArrayIterator::offsetUnset — Unset value for an offset
설명
public void ArrayIterator::offsetUnset
( string
$index
)Unsets a value for an offset.
Warning
이 함수는 현재 문서화 되어있지 않습니다; 인수 목록만을 제공합니다.
인수
-
index -
The offset to unset.
반환값
값을 반환하지 않습니다.
참고
- ArrayIterator::offsetGet() - Get value for an offset
- ArrayIterator::offsetSet() - Set value for an offset
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User Contributed Notes 3 notes
olav at fwt dot no ¶
13 years ago
rkos... ¶
10 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);
?>
Adil Baig @ AIdezigns ¶
13 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.
