/**
  * UTF-8 aware alternative to strcspn
  * Find length of initial segment not matching mask
  *
  * @param   string   $str     The string to process
  * @param   string   $mask    The mask
  * @param   integer  $start   Optional starting character position (in characters)
  * @param   integer  $length  Optional length
  *
  * @return  integer  The length of the initial segment of str1 which does not contain any of the characters in str2
  *
  * @see     http://www.php.net/strcspn
  * @since   11.1
  */
 public static function strcspn($str, $mask, $start = null, $length = null)
 {
     jimport('phputf8.strcspn');
     if ($start === false && $length === false) {
         return utf8_strcspn($str, $mask);
     } elseif ($length === false) {
         return utf8_strcspn($str, $mask, $start);
     } else {
         return utf8_strcspn($str, $mask, $start, $length);
     }
 }

 /**
  * UTF-8 aware alternative to strcspn
  * Find length of initial segment not matching mask
  *
  * @static
  * @access public
  * @param string
  * @param string the mask
  * @param int Optional starting character position (in characters)
  * @param int Optional length
  * @return int the length of the initial segment of str1 which does not contain any of the characters in str2
  * @see http://www.php.net/strcspn
  */
 public static function strcspn($str, $mask, $start = NULL, $length = NULL)
 {
     jimport('phputf8.strcspn');
     if ($start === FALSE && $length === FALSE) {
         return utf8_strcspn($str, $mask);
     } else {
         if ($length === FALSE) {
             return utf8_strcspn($str, $mask, $start);
         } else {
             return utf8_strcspn($str, $mask, $start, $length);
         }
     }
 }

 /**
  * UTF-8 aware alternative to strcspn
  * Find length of initial segment not matching mask
  *
  * @param   string   $str     The string to process
  * @param   string   $mask    The mask
  * @param   integer  $start   Optional starting character position (in characters)
  * @param   integer  $length  Optional length
  *
  * @return  integer  The length of the initial segment of str1 which does not contain any of the characters in str2
  *
  * @see     http://www.php.net/strcspn
  * @since   2.0
  */
 public static function strcspn($str, $mask, $start = null, $length = null)
 {
     if (!function_exists('utf8_strcspn')) {
         require_once __DIR__ . '/phputf8/strcspn.php';
     }
     if ($start === null && $length === null) {
         return utf8_strcspn($str, $mask);
     }
     if ($length === null) {
         return utf8_strcspn($str, $mask, $start);
     }
     return utf8_strcspn($str, $mask, $start, $length);
 }

 function testLinefeedMask()
 {
     $str = "i\nñtërnâtiônàlizætiøn";
     $this->assertEqual(utf8_strcspn($str, "\n"), 1);
 }

 /**
  * UTF-8 aware alternative to strcspn
  * Find length of initial segment not matching mask
  *
  * @param   string   $str     The string to process
  * @param   string   $mask    The mask
  * @param   integer  $start   Optional starting character position (in characters)
  * @param   integer  $length  Optional length
  *
  * @return  integer  The length of the initial segment of str1 which does not contain any of the characters in str2
  *
  * @see     http://www.php.net/strcspn
  * @since   1.0
  */
 public static function strcspn($str, $mask, $start = null, $length = null)
 {
     require_once __DIR__ . '/phputf8/strcspn.php';
     if ($start === false && $length === false) {
         return utf8_strcspn($str, $mask);
     }
     if ($length === false) {
         return utf8_strcspn($str, $mask, $start);
     }
     return utf8_strcspn($str, $mask, $start, $length);
 }

 /**
  * UTF-8 aware alternative to strcspn()
  *
  * Find length of initial segment not matching mask.
  *
  * @param   string   $str     The string to process
  * @param   string   $mask    The mask
  * @param   integer  $start   Optional starting character position (in characters)
  * @param   integer  $length  Optional length
  *
  * @return  integer  The length of the initial segment of str1 which does not contain any of the characters in str2
  *
  * @see     http://www.php.net/strcspn
  * @since   1.3.0
  */
 public static function strcspn($str, $mask, $start = null, $length = null)
 {
     if ($start === false && $length === false) {
         return utf8_strcspn($str, $mask);
     }
     if ($length === false) {
         return utf8_strcspn($str, $mask, $start);
     }
     return utf8_strcspn($str, $mask, $start, $length);
 }