I did that manually when I was not getting expected result using mb_convert_kana().
<?php
function han_kaku_to_jen_kaku($str){
$replace_of = array('ï½³ï¾','カï¾','ï½·ï¾','クï¾',
'ï½¹ï¾','コï¾','ï½»ï¾','ï½¼ï¾',
'ï½½ï¾','ï½¾ï¾','ソï¾','ï¾ï¾',
'ï¾ï¾','ï¾ï¾','ï¾ï¾','ï¾ï¾',
'ï¾ï¾','ï¾ï¾','ï¾ï¾','ï¾ï¾',
'ï¾ï¾','ï¾ï¾','ï¾ï¾','ï¾ï¾','ï¾ï¾','ï¾ï¾');
$replace_by = array('ã´','ã¬','ã®','ã°',
'ã²','ã´','ã¶','ã¸',
'ãº','ã¼','ã¾','ã',
'ã','ã
','ã','ã',
'ã','ã','ã','ã',
'ã','ã','ã','ã','ã','ã');
$_result = str_replace($replace_of, $replace_by, $str);
$replace_of = array('ï½±','ï½²','ï½³','ï½´','ï½µ',
'カ','キ','ク','ケ','コ',
'サ','シ','ス','セ','ソ',
'ï¾','ï¾','ï¾','ï¾','ï¾',
'ï¾
','ï¾','ï¾','ï¾','ï¾',
'ï¾','ï¾','ï¾','ï¾','ï¾',
'ï¾','ï¾','ï¾','ï¾','ï¾',
'ï¾','ï¾','ï¾','ï¾','ï¾',
'ï¾','ï¾','ï¾','ï¾','ヲ',
'ï¾','ァ','ィ','ゥ','ェ',
'ォ','ãµ','ã¶','ャ','ï½',
'ョ','ッ','、','。','ー',
'ï½¢','ï½£','ï¾','ï¾');
$replace_by = array('ã¢','ã¤','ã¦','ã¨','ãª',
'ã«','ã','ã¯','ã±','ã³',
'ãµ','ã·','ã¹','ã»','ã½',
'ã¿','ã','ã','ã','ã',
'ã','ã','ã','ã','ã',
'ã','ã','ã','ã','ã',
'ã','ã','ã ','ã¡','ã¢',
'ã¤','ã¦','ã¨','ã©','ãª',
'ã«','ã¬','ã','ã¯','ã²',
'ã³','ã¡','ã£','ã¥','ã§',
'ã©','ã¶','ã¶','ã£','ã¥',
'ã§','ã','ã','ã','ã¼',
'ã','ã','â','');
$_result = str_replace($replace_of, $replace_by, $_result);
return $_result;
}
?>