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    ArrayIterator::offsetUnset

    (PHP 5, PHP 7)

    ArrayIterator::offsetUnset — Unset value for an offset

    Opis

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

    Unsets a value for an offset.

    Ostrzeżenie

    Ta funkcja jest obecnie nieudokumentowana, dostępna jest jedynie lista jej argumentów.

    Parametry

    index

    The offset to unset.

    Zwracane wartości

    Nie jest zwracana żadna wartość.

    Zobacz też:

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    User Contributed Notes 3 notes

    up
    2
    rkos...
    9 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
    2
    olav at fwt dot no
    12 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
    0
    Adil Baig @ AIdezigns
    12 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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