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   1  <?php
   2  /**
   3  * @version $Id: strspn.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 strspn
  11  * Find length of initial segment matching mask
  12  * Note: requires utf8_strlen and utf8_substr (if start, length are used)
  13  * @param string
  14  * @return int
  15  * @see http://www.php.net/strspn
  16  * @package utf8
  17  * @subpackage strings
  18  */
  19  function utf8_strspn($str, $mask, $start = NULL, $length = NULL) {
  20      
  21      $mask = preg_replace('!([\\\\\\-\\]\\[/^])!','\\\$1}',$mask);
  22      
  23      if ( $start !== NULL || $length !== NULL ) {
  24          $str = utf8_substr($str, $start, $length);
  25      }
  26          
  27      preg_match('/^['.$mask.']+/u',$str, $matches);
  28      
  29      if ( isset($matches[0]) ) {
  30          return utf8_strlen($matches[0]);
  31      }
  32      
  33      return 0;
  34  
  35  }
  36