function hotpot_utf8_to_html_entity in Quiz 6.6

Same name and namespace in other branches

1. 6.5 includes/moodle/question/format/hotpot/format.php \hotpot_utf8_to_html_entity()

File

includes/moodle/question/format/hotpot/format.php, line 648

Code

function hotpot_utf8_to_html_entity($char) {

  // http://www.zend.com/codex.php?id=835&single=1
  // array used to figure what number to decrement from character order value
  // according to number of characters used to map unicode to ascii by utf-8
  static $HOTPOT_UTF8_DECREMENT = array(
    1 => 0,
    2 => 192,
    3 => 224,
    4 => 240,
  );

  // the number of bits to shift each character by
  static $HOTPOT_UTF8_SHIFT = array(
    1 => array(
      0 => 0,
    ),
    2 => array(
      0 => 6,
      1 => 0,
    ),
    3 => array(
      0 => 12,
      1 => 6,
      2 => 0,
    ),
    4 => array(
      0 => 18,
      1 => 12,
      2 => 6,
      3 => 0,
    ),
  );
  $dec = 0;
  $len = strlen($char);
  for ($pos = 0; $pos < $len; $pos++) {
    $ord = ord($char[$pos]);
    $ord -= $pos ? 128 : $HOTPOT_UTF8_DECREMENT[$len];
    $dec += $ord << $HOTPOT_UTF8_SHIFT[$len][$pos];
  }
  return '&#x' . sprintf('%04X', $dec) . ';';
}