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   1  <?php
   2  /**
   3  * @version $Id: str_split.php,v 1.1 2006/02/25 13:50:17 harryf Exp $
   4  * @package utf8
   5  * @subpackage strings
   6  */
   7  
   8  //---------------------------------------------------------------
   9  /**
  10  * UTF-8 aware alternative to str_split
  11  * Convert a string to an array
  12  * Note: requires utf8_strlen to be loaded
  13  * @param string UTF-8 encoded
  14  * @param int number to characters to split string by
  15  * @return string characters in string reverses
  16  * @see http://www.php.net/str_split
  17  * @see utf8_strlen
  18  * @package utf8
  19  * @subpackage strings
  20  */
  21  function utf8_str_split($str, $split_len = 1) {
  22      
  23      if ( !preg_match('/^[0-9]+$/',$split_len) || $split_len < 1 ) {
  24          return FALSE;
  25      }
  26      
  27      $len = utf8_strlen($str);
  28      if ( $len <= $split_len ) {
  29          return array($str);
  30      }
  31      
  32      preg_match_all('/.{'.$split_len.'}|[^\x00]{1,'.$split_len.'}$/us', $str, $ar);
  33      return $ar[0];
  34      
  35  }