vendor/phputf8/ord.php

   1 <?php
   2 /**
   3 * @version $Id: ord.php,v 1.4 2006/09/11 15:22:54 harryf Exp $
   4 * @package utf8
   5 * @subpackage strings
   6 */
   7
   8 //---------------------------------------------------------------
   9 /**
  10 * UTF-8 aware alternative to ord
  11 * Returns the unicode ordinal for a character
  12 * @param string UTF-8 encoded character
  13 * @return int unicode ordinal for the character
  14 * @see http://www.php.net/ord
  15 * @see http://www.php.net/manual/en/function.ord.php#46267
  16 */
  17 function utf8_ord($chr) {
  18
  19     $ord0 = ord($chr);
  20
  21     if ( $ord0 >= 0 && $ord0 <= 127 ) {
  22         return $ord0;
  23     }
  24
  25     if ( !isset($chr{1}) ) {
  26         trigger_error('Short sequence - at least 2 bytes expected, only 1 seen');
  27         return FALSE;
  28     }
  29
  30     $ord1 = ord($chr{1});
  31     if ( $ord0 >= 192 && $ord0 <= 223 ) {
  32         return ( $ord0 - 192 ) * 64
  33             + ( $ord1 - 128 );
  34     }
  35
  36     if ( !isset($chr{2}) ) {
  37         trigger_error('Short sequence - at least 3 bytes expected, only 2 seen');
  38         return FALSE;
  39     }
  40     $ord2 = ord($chr{2});
  41     if ( $ord0 >= 224 && $ord0 <= 239 ) {
  42         return ($ord0-224)*4096
  43             + ($ord1-128)*64
  44                 + ($ord2-128);
  45     }
  46
  47     if ( !isset($chr{3}) ) {
  48         trigger_error('Short sequence - at least 4 bytes expected, only 3 seen');
  49         return FALSE;
  50     }
  51     $ord3 = ord($chr{3});
  52     if ($ord0>=240 && $ord0<=247) {
  53         return ($ord0-240)*262144
  54             + ($ord1-128)*4096
  55                 + ($ord2-128)*64
  56                     + ($ord3-128);
  57
  58     }
  59
  60     if ( !isset($chr{4}) ) {
  61         trigger_error('Short sequence - at least 5 bytes expected, only 4 seen');
  62         return FALSE;
  63     }
  64     $ord4 = ord($chr{4});
  65     if ($ord0>=248 && $ord0<=251) {
  66         return ($ord0-248)*16777216
  67             + ($ord1-128)*262144
  68                 + ($ord2-128)*4096
  69                     + ($ord3-128)*64
  70                         + ($ord4-128);
  71     }
  72
  73     if ( !isset($chr{5}) ) {
  74         trigger_error('Short sequence - at least 6 bytes expected, only 5 seen');
  75         return FALSE;
  76     }
  77     if ($ord0>=252 && $ord0<=253) {
  78         return ($ord0-252) * 1073741824
  79             + ($ord1-128)*16777216
  80                 + ($ord2-128)*262144
  81                     + ($ord3-128)*4096
  82                         + ($ord4-128)*64
  83                             + (ord($c{5})-128);
  84     }
  85
  86     if ( $ord0 >= 254 && $ord0 <= 255 ) {
  87         trigger_error('Invalid UTF-8 with surrogate ordinal '.$ord0);
  88         return FALSE;
  89     }
  90
  91 }
  92