PHP 字符串 加*

PHP字符串加*

<?php
class CryptoStr{
//中间加密字符串
function getCryptoStr($str) {
$len = strlen($str);
$first = substr( $str, 0, 1 );
$last  = substr( $str, $len-1,1 );
echo $first."****".$last;
}

function getCryptoMbStr($str) {
$len = mb_strlen($str,'utf-8');
$first = mb_substr($str,0,1,'utf-8');
$last = mb_substr($str,$len-1,1,'utf-8');
echo $first."****".$last;
}
}
$obj = new CryptoStr();
// $obj->getCryptoStr('zabcs6');
// $obj->getCryptoStr('中国');

$obj->getCryptoMbStr('zabcs6');
$obj->getCryptoMbStr('中国');
?>

z****6 中****国