function _transliteration_ord_utf8

Finds the character code for a UTF-8 character: like ord() but for UTF-8.

Parameters

string $character: A single UTF-8 character.

Return value

int: The character code, or -1 if an illegal character is found.

File

includes/transliteration.inc, line 329

Transliteration processing functions.

Code

function _transliteration_ord_utf8($character) {
  $first_byte = ord($character[0]);

  if (($first_byte & 0x80) == 0) {
    // Single-byte form: 0xxxxxxxx.
    return $first_byte;
  }
  if (($first_byte & 0xe0) == 0xc0) {
    // Two-byte form: 110xxxxx 10xxxxxx.
    return (($first_byte & 0x1f) << 6) + (ord($character[1]) & 0x3f);
  }
  if (($first_byte & 0xf0) == 0xe0) {
    // Three-byte form: 1110xxxx 10xxxxxx 10xxxxxx.
    return (($first_byte & 0x0f) << 12) + ((ord($character[1]) & 0x3f) << 6) + (ord($character[2]) & 0x3f);
  }
  if (($first_byte & 0xf8) == 0xf0) {
    // Four-byte form: 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx.
    return (($first_byte & 0x07) << 18) + ((ord($character[1]) & 0x3f) << 12) + ((ord($character[2]) & 0x3f) << 6) + (ord($character[3]) & 0x3f);
  }

  // Other forms are not legal.
  return -1;
}