/**
* This method returns a new Unicode_String object that represents $string with all its characters converted to lower case.
*
* Note that for some languages converting to lowercase may
* change the length of the string.
*
* The database that contains this information is quite large
* and is stored in a separate file (Unicode/String/CaseDB.php)
* that is only loaded when required.
* @return Unicode_String
*/
function toLower()
{
$lower = new Unicode_String();
foreach ($this->chars() as $char) {
$lower->append($char->toLower());
}
return $lower;
}
/**
* This method returns the lowercase representation of $string.
*
* This may be either a single Unicode_Character (eg E =gt; e)
* or it may be a Unicode_String (eg ß =gt; ss).
*
* NB: This class does not implement toUpper() because to do so
* requires knowledge of the string in which the character
* appears.
* @return Unicode_String|Unicode_Character
*/
function toLower()
{
if (!isset($GLOBALS['Unicode_Character_CaseCache'][$this->ord()])) {
$GLOBALS['Unicode_Character_CaseCache'][$this->ord()] = $this;
require_once dirname(__FILE__) . '/String/CaseDB.php';
foreach ($GLOBALS['Unicode_String_CaseDB'] as $row) {
if ($row['upper'] == $this->ord()) {
if (count($row['lower']) > 1) {
require_once dirname(__FILE__) . '/String.php';
$lower = new Unicode_String();
foreach ($row['lower'] as $char) {
$lower->append(new Unicode_Character($char));
}
} else {
$lower = new Unicode_Character($row['lower'][0]);
}
$GLOBALS['Unicode_Character_CaseCache'][$this->ord()] = $lower;
break;
}
}
}
return $GLOBALS['Unicode_Character_CaseCache'][$this->ord()];
}
