chr() with unicode support
<?php
function uchr ($codes) {
 if (is_scalar($codes)) $codes= func_get_args();
 $str= '';
 foreach ($codes as $code) $str.= html_entity_decode('&#'.$code.';',ENT_NOQUOTES,'UTF-8');
 return $str;
}
echo uchr(23383); echo '<br/>';
echo uchr(23383,215,23383); echo '<br/>';
echo uchr(array(23383,215,23383,215,23383)); echo '<br/>';
?>