strripos.php

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<?php
/* vim: set expandtab tabstop=4 shiftwidth=4: */
// +----------------------------------------------------------------------+
// | PHP Version 4                                                        |
// +----------------------------------------------------------------------+
// | Copyright (c) 1997-2004 The PHP Group                                |
// +----------------------------------------------------------------------+
// | This source file is subject to version 3.0 of the PHP license,       |
// | that is bundled with this package in the file LICENSE, and is        |
// | available at through the world-wide-web at                           |
// | http://www.php.net/license/3_0.txt.                                  |
// | If you did not receive a copy of the PHP license and are unable to   |
// | obtain it through the world-wide-web, please send a note to          |
// | [e-mail] so we can mail you a copy immediately.               |
// +----------------------------------------------------------------------+
// | Authors: Aidan Lister <[e-mail]>                                |
// |          Stephan Schmidt <[e-mail]>                             |
// +----------------------------------------------------------------------+
//
// $Id: strripos.php,v 1.15 2004/06/12 06:53:00 aidan Exp $
//


/**
 * Replace strripos()
 *
 * @category    PHP
 * @package     PHP_Compat
 * @link        http://php.net/function.strripos
 * @author      Aidan Lister <[e-mail]>
 * @author      Stephan Schmidt <[e-mail]>
 * @version     $Revision: 1.15 $
 * @since       PHP 5
 */
if (!function_exists('strripos'))
{
    function strripos ($haystack, $needle, $offset = null)
    {
        if (!is_scalar($haystack)) {
            trigger_error('strripos() expects parameter 1 to be scalar, ' . gettype($haystack) . ' given', E_USER_WARNING);
            return false;
        }

        if (!is_scalar($needle)) {
            trigger_error('strripos() expects parameter 2 to be scalar, ' . gettype($needle) . ' given', E_USER_WARNING);
            return false;
        }

        if (!is_null($offset) && !is_numeric($offset)) {
            trigger_error('strripos() expects parameter 3 to be long, ' . gettype($offset) . ' given', E_USER_WARNING);
            return false;
        }

        // Manipulate the string if there is an offset
        $fix = 0;
        if (!is_null($offset))
		{
			// If the offset is larger than the haystack, return
			if (abs($offset) >= strlen($haystack)) {
				return false;
			}

			// Check whether offset is negative or positive
            if ($offset > 0) {
                $haystack = substr($haystack, $offset, strlen($haystack) - $offset);
				// We need to add this to the position of the needle
				$fix = $offset;
            }
            else {
                $haystack = substr($haystack, 0, strlen($haystack) + $offset);
            }
        }

        $segments = explode(strtolower($needle), strtolower($haystack));
		
		$last_seg = count($segments) - 1;
		$position = strlen($haystack) + $fix - strlen($segments[$last_seg]) - strlen($needle);

		return $position;
    }
}
?>