/libraries/phputf8/ord.php
PHP | 92 lines | 65 code | 13 blank | 14 comment | 19 complexity | 3164e567745e089911692daabadee515 MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.1
- <?php
- /**
- * @version $Id$
- * @package utf8
- * @subpackage strings
- */
- //---------------------------------------------------------------
- /**
- * UTF-8 aware alternative to ord
- * Returns the unicode ordinal for a character
- * @param string UTF-8 encoded character
- * @return int unicode ordinal for the character
- * @see http://www.php.net/ord
- * @see http://www.php.net/manual/en/function.ord.php#46267
- */
- function utf8_ord($chr) {
- $ord0 = ord($chr);
- if ( $ord0 >= 0 && $ord0 <= 127 ) {
- return $ord0;
- }
- if ( !isset($chr{1}) ) {
- trigger_error('Short sequence - at least 2 bytes expected, only 1 seen');
- return FALSE;
- }
- $ord1 = ord($chr{1});
- if ( $ord0 >= 192 && $ord0 <= 223 ) {
- return ( $ord0 - 192 ) * 64
- + ( $ord1 - 128 );
- }
- if ( !isset($chr{2}) ) {
- trigger_error('Short sequence - at least 3 bytes expected, only 2 seen');
- return FALSE;
- }
- $ord2 = ord($chr{2});
- if ( $ord0 >= 224 && $ord0 <= 239 ) {
- return ($ord0-224)*4096
- + ($ord1-128)*64
- + ($ord2-128);
- }
- if ( !isset($chr{3}) ) {
- trigger_error('Short sequence - at least 4 bytes expected, only 3 seen');
- return FALSE;
- }
- $ord3 = ord($chr{3});
- if ($ord0>=240 && $ord0<=247) {
- return ($ord0-240)*262144
- + ($ord1-128)*4096
- + ($ord2-128)*64
- + ($ord3-128);
- }
- if ( !isset($chr{4}) ) {
- trigger_error('Short sequence - at least 5 bytes expected, only 4 seen');
- return FALSE;
- }
- $ord4 = ord($chr{4});
- if ($ord0>=248 && $ord0<=251) {
- return ($ord0-248)*16777216
- + ($ord1-128)*262144
- + ($ord2-128)*4096
- + ($ord3-128)*64
- + ($ord4-128);
- }
- if ( !isset($chr{5}) ) {
- trigger_error('Short sequence - at least 6 bytes expected, only 5 seen');
- return FALSE;
- }
- if ($ord0>=252 && $ord0<=253) {
- return ($ord0-252) * 1073741824
- + ($ord1-128)*16777216
- + ($ord2-128)*262144
- + ($ord3-128)*4096
- + ($ord4-128)*64
- + (ord($chr{5})-128);
- }
- if ( $ord0 >= 254 && $ord0 <= 255 ) {
- trigger_error('Invalid UTF-8 with surrogate ordinal '.$ord0);
- return FALSE;
- }
- }