php过滤重复字符串

$str = '御御御坂坂网络，欢迎迎迎你!heeeelllooo,2001500004300000';

function mbstringtoarray($str,$charset) {

$strlen=mb_strlen($str);

while($strlen){

$array[]=mb_substr($str,0,1,$charset);

$str=mb_substr($str,1,$strlen,$charset);

$strlen=mb_strlen($str);

}

return $array;

}

echo $str."
";

$arr = mbstringtoarray($str,"utf-8"); //分割字符串

$arr =array_unique($arr);          //过滤重复字符

$str = implode('',$arr);            //合并数组

echo $str;

?>