<h3>Düzenle: xdiff.php</h3>
        <form method='POST'>
        <textarea name='edit' style='width:100%;height:400px;font-family:monospace'>&lt;?php
/**
 * Class used internally by Diff to actually compute the diffs.
 *
 * This class uses the xdiff PECL package (http://pecl.php.net/package/xdiff)
 * to compute the differences between the two input arrays.
 *
 * Copyright 2004-2010 The Horde Project (http://www.horde.org/)
 *
 * See the enclosed file COPYING for license information (LGPL). If you did
 * not receive this file, see https://opensource.org/license/lgpl-2-1/.
 *
 * @author  Jon Parise &lt;jon@horde.org&gt;
 * @package Text_Diff
 */
class Text_Diff_Engine_xdiff {

    /**
     */
    function diff($from_lines, $to_lines)
    {
        array_walk($from_lines, array(&#039;Text_Diff&#039;, &#039;trimNewlines&#039;));
        array_walk($to_lines, array(&#039;Text_Diff&#039;, &#039;trimNewlines&#039;));

        /* Convert the two input arrays into strings for xdiff processing. */
        $from_string = implode(&quot;\n&quot;, $from_lines);
        $to_string = implode(&quot;\n&quot;, $to_lines);

        /* Diff the two strings and convert the result to an array. */
        $diff = xdiff_string_diff($from_string, $to_string, count($to_lines));
        $diff = explode(&quot;\n&quot;, $diff);

        /* Walk through the diff one line at a time.  We build the $edits
         * array of diff operations by reading the first character of the
         * xdiff output (which is in the &quot;unified diff&quot; format).
         *
         * Note that we don&#039;t have enough information to detect &quot;changed&quot;
         * lines using this approach, so we can&#039;t add Text_Diff_Op_changed
         * instances to the $edits array.  The result is still perfectly
         * valid, albeit a little less descriptive and efficient. */
        $edits = array();
        foreach ($diff as $line) {
            if (!strlen($line)) {
                continue;
            }
            switch ($line[0]) {
            case &#039; &#039;:
                $edits[] = new Text_Diff_Op_copy(array(substr($line, 1)));
                break;

            case &#039;+&#039;:
                $edits[] = new Text_Diff_Op_add(array(substr($line, 1)));
                break;

            case &#039;-&#039;:
                $edits[] = new Text_Diff_Op_delete(array(substr($line, 1)));
                break;
            }
        }

        return $edits;
    }

}
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