/*替换，姓名字符串*/
private function substrCut($userName)
{
$strlen = mb_strlen($userName, 'utf-8');
$firstStr = mb_substr($userName, 0, 1, 'utf-8');
$lastStr = mb_substr($userName, -1, 1, 'utf-8');
$resultName = ($strlen == 2) ? $firstStr . str_repeat('*', mb_strlen($userName, 'utf-8') - 1) : $firstStr . str_repeat("*", $strlen - 2) . $lastStr;
return $resultName;
}