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