source: sourcecode/system/helpers/string_helper.php @ 1

<?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');
/**
 * CodeIgniter
 *
 * An open source application development framework for PHP 5.1.6 or newer
 *
 * @package             CodeIgniter
 * @author              ExpressionEngine Dev Team
 * @copyright   Copyright (c) 2008 - 2011, EllisLab, Inc.
 * @license             http://codeigniter.com/user_guide/license.html
 * @link                http://codeigniter.com
 * @since               Version 1.0
 * @filesource
 */

// ------------------------------------------------------------------------

/**
 * CodeIgniter String Helpers
 *
 * @package             CodeIgniter
 * @subpackage  Helpers
 * @category    Helpers
 * @author              ExpressionEngine Dev Team
 * @link                http://codeigniter.com/user_guide/helpers/string_helper.html
 */

// ------------------------------------------------------------------------

/**
 * Trim Slashes
 *
 * Removes any leading/trailing slashes from a string:
 *
 * /this/that/theother/
 *
 * becomes:
 *
 * this/that/theother
 *
 * @access      public
 * @param       string
 * @return      string
 */
if ( ! function_exists('trim_slashes'))
{
        function trim_slashes($str)
        {
                return trim($str, '/');
        }
}

// ------------------------------------------------------------------------

/**
 * Strip Slashes
 *
 * Removes slashes contained in a string or in an array
 *
 * @access      public
 * @param       mixed   string or array
 * @return      mixed   string or array
 */
if ( ! function_exists('strip_slashes'))
{
        function strip_slashes($str)
        {
                if (is_array($str))
                {
                        foreach ($str as $key => $val)
                        {
                                $str[$key] = strip_slashes($val);
                        }
                }
                else
                {
                        $str = stripslashes($str);
                }

                return $str;
        }
}

// ------------------------------------------------------------------------

/**
 * Strip Quotes
 *
 * Removes single and double quotes from a string
 *
 * @access      public
 * @param       string
 * @return      string
 */
if ( ! function_exists('strip_quotes'))
{
        function strip_quotes($str)
        {
                return str_replace(array('"', "'"), '', $str);
        }
}

// ------------------------------------------------------------------------

/**
 * Quotes to Entities
 *
 * Converts single and double quotes to entities
 *
 * @access      public
 * @param       string
 * @return      string
 */
if ( ! function_exists('quotes_to_entities'))
{
        function quotes_to_entities($str)
        {
                return str_replace(array("\'","\"","'",'"'), array("&#39;","&quot;","&#39;","&quot;"), $str);
        }
}

// ------------------------------------------------------------------------

/**
 * Reduce Double Slashes
 *
 * Converts double slashes in a string to a single slash,
 * except those found in http://
 *
 * http://www.some-site.com//index.php
 *
 * becomes:
 *
 * http://www.some-site.com/index.php
 *
 * @access      public
 * @param       string
 * @return      string
 */
if ( ! function_exists('reduce_double_slashes'))
{
        function reduce_double_slashes($str)
        {
                return preg_replace("#(^|[^:])//+#", "\\1/", $str);
        }
}

// ------------------------------------------------------------------------

/**
 * Reduce Multiples
 *
 * Reduces multiple instances of a particular character.  Example:
 *
 * Fred, Bill,, Joe, Jimmy
 *
 * becomes:
 *
 * Fred, Bill, Joe, Jimmy
 *
 * @access      public
 * @param       string
 * @param       string  the character you wish to reduce
 * @param       bool    TRUE/FALSE - whether to trim the character from the beginning/end
 * @return      string
 */
if ( ! function_exists('reduce_multiples'))
{
        function reduce_multiples($str, $character = ',', $trim = FALSE)
        {
                $str = preg_replace('#'.preg_quote($character, '#').'{2,}#', $character, $str);

                if ($trim === TRUE)
                {
                        $str = trim($str, $character);
                }

                return $str;
        }
}

// ------------------------------------------------------------------------

/**
 * Create a Random String
 *
 * Useful for generating passwords or hashes.
 *
 * @access      public
 * @param       string  type of random string.  basic, alpha, alunum, numeric, nozero, unique, md5, encrypt and sha1
 * @param       integer number of characters
 * @return      string
 */
if ( ! function_exists('random_string'))
{
        function random_string($type = 'alnum', $len = 8)
        {
                switch($type)
                {
                        case 'basic'    : return mt_rand();
                                break;
                        case 'alnum'    :
                        case 'numeric'  :
                        case 'nozero'   :
                        case 'alpha'    :

                                        switch ($type)
                                        {
                                                case 'alpha'    :       $pool = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
                                                        break;
                                                case 'alnum'    :       $pool = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
                                                        break;
                                                case 'numeric'  :       $pool = '0123456789';
                                                        break;
                                                case 'nozero'   :       $pool = '123456789';
                                                        break;
                                        }

                                        $str = '';
                                        for ($i=0; $i < $len; $i++)
                                        {
                                                $str .= substr($pool, mt_rand(0, strlen($pool) -1), 1);
                                        }
                                        return $str;
                                break;
                        case 'unique'   :
                        case 'md5'              :

                                                return md5(uniqid(mt_rand()));
                                break;
                        case 'encrypt'  :
                        case 'sha1'     :

                                                $CI =& get_instance();
                                                $CI->load->helper('security');

                                                return do_hash(uniqid(mt_rand(), TRUE), 'sha1');
                                break;
                }
        }
}

// ------------------------------------------------------------------------

/**
 * Add's _1 to a string or increment the ending number to allow _2, _3, etc
 *
 * @param   string  $str  required
 * @param   string  $separator  What should the duplicate number be appended with
 * @param   string  $first  Which number should be used for the first dupe increment
 * @return  string
 */
function increment_string($str, $separator = '_', $first = 1)
{
        preg_match('/(.+)'.$separator.'([0-9]+)$/', $str, $match);

        return isset($match[2]) ? $match[1].$separator.($match[2] + 1) : $str.$separator.$first;
}

// ------------------------------------------------------------------------

/**
 * Alternator
 *
 * Allows strings to be alternated.  See docs...
 *
 * @access      public
 * @param       string (as many parameters as needed)
 * @return      string
 */
if ( ! function_exists('alternator'))
{
        function alternator()
        {
                static $i;

                if (func_num_args() == 0)
                {
                        $i = 0;
                        return '';
                }
                $args = func_get_args();
                return $args[($i++ % count($args))];
        }
}

// ------------------------------------------------------------------------

/**
 * Repeater function
 *
 * @access      public
 * @param       string
 * @param       integer number of repeats
 * @return      string
 */
if ( ! function_exists('repeater'))
{
        function repeater($data, $num = 1)
        {
                return (($num > 0) ? str_repeat($data, $num) : '');
        }
}


/* End of file string_helper.php */
/* Location: ./system/helpers/string_helper.php */