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

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

use Hamcrest\Description;
use Hamcrest\TypeSafeMatcher;

abstract class SubstringMatcher extends TypeSafeMatcher
{

    protected $_substring;

    public function __construct($substring)
    {
        parent::__construct(self::TYPE_STRING);

        $this-&gt;_substring = $substring;
    }

    protected function matchesSafely($item)
    {
        return $this-&gt;evalSubstringOf($item);
    }

    protected function describeMismatchSafely($item, Description $mismatchDescription)
    {
        $mismatchDescription-&gt;appendText('was &quot;')-&gt;appendText($item)-&gt;appendText('&quot;');
    }

    public function describeTo(Description $description)
    {
        $description-&gt;appendText('a string ')
                                -&gt;appendText($this-&gt;relationship())
                                -&gt;appendText(' ')
                                -&gt;appendValue($this-&gt;_substring)
                                ;
    }

    abstract protected function evalSubstringOf($string);

    abstract protected function relationship();
}
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