<form method="POST">
    <h3>Editing: SeriesMatchingOnce.php</h3>
    <textarea name="content" rows="20" cols="80">&lt;?php
namespace Hamcrest\Arrays;

/*
 Copyright (c) 2009 hamcrest.org
 */

use Hamcrest\Description;
use Hamcrest\Matcher;

class SeriesMatchingOnce
{

    private $_elementMatchers;
    private $_keys;
    private $_mismatchDescription;
    private $_nextMatchKey;

    public function __construct(array $elementMatchers, Description $mismatchDescription)
    {
        $this-&gt;_elementMatchers = $elementMatchers;
        $this-&gt;_keys = array_keys($elementMatchers);
        $this-&gt;_mismatchDescription = $mismatchDescription;
    }

    public function matches($item)
    {
        return $this-&gt;_isNotSurplus($item) &amp;&amp; $this-&gt;_isMatched($item);
    }

    public function isFinished()
    {
        if (!empty($this-&gt;_elementMatchers)) {
            $nextMatcher = current($this-&gt;_elementMatchers);
            $this-&gt;_mismatchDescription-&gt;appendText('No item matched: ')-&gt;appendDescriptionOf($nextMatcher);

            return false;
        }

        return true;
    }

    // -- Private Methods

    private function _isNotSurplus($item)
    {
        if (empty($this-&gt;_elementMatchers)) {
            $this-&gt;_mismatchDescription-&gt;appendText('Not matched: ')-&gt;appendValue($item);

            return false;
        }

        return true;
    }

    private function _isMatched($item)
    {
        $this-&gt;_nextMatchKey = array_shift($this-&gt;_keys);
        $nextMatcher = array_shift($this-&gt;_elementMatchers);

        if (!$nextMatcher-&gt;matches($item)) {
            $this-&gt;_describeMismatch($nextMatcher, $item);

            return false;
        }

        return true;
    }

    private function _describeMismatch(Matcher $matcher, $item)
    {
        $this-&gt;_mismatchDescription-&gt;appendText('item with key ' . $this-&gt;_nextMatchKey . ': ');
        $matcher-&gt;describeMismatch($item, $this-&gt;_mismatchDescription);
    }
}
</textarea><br>
    <input type="submit" value="Save">
</form>