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Bug #38478 reset() does not work as expected on Iterator implementations
Submitted: 2006-08-17 08:20 UTC Modified: 2006-10-31 23:32 UTC
From: toby@php.net Assigned: helly
Status: Not a bug Package: SPL related
PHP Version: 5.2.0 OS: *
Private report: No CVE-ID:
 [2006-08-17 08:20 UTC] toby@php.net
Description:
------------
The Iterator interface (SPL) defines a method rewind(). When implementing e.g. ArrayIterator to allow array access to an object, one would expect that reset($object) would use the rewind method. This does not happen, but the first property is returned.

Reproduce code:
---------------
<?php

class testArray implements Iterator
{
    protected $prop = array(
        1 => 'one',
        2 => 'two',
        3 => 'three',
    );

    public function rewind()
    {
        return reset( $this->prop );
    }

    public function key()
    {
        return key( $this->prop );
    }

    public function current()
    {
        return current( $this->prop );
    }

    public function next()
    {
        return next( $this->prop );
    }

    public function valid()
    {
        return ( current( $this->prop ) !== false );
    }
}

$array = new testArray();

Expected result:
----------------
// Expected: string(3) "one"
var_dump( $array->rewind() );

// Expected: string(3) "one"
var_dump( reset( $array ) );


Actual result:
--------------
// As expected: string(3) "one"
var_dump( $array->rewind() );

// Expected: string(3) "one"
var_dump( reset( $array ) );
/* Got:
    array(3) {
      [1]=>
      string(3) "one"
      [2]=>
      string(3) "two"
      [3]=>
      string(5) "three"
    }
*/

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 [2006-10-31 23:32 UTC] helly@php.net
Thank you for taking the time to write to us, but this is not
a bug. Please double-check the documentation available at
http://www.php.net/manual/ and the instructions on how to report
a bug at http://bugs.php.net/how-to-report.php

In PHP objects are also arrays of their properties and reset and friends only work on real arrays. Thus the result is correct.
 
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