// 中文名称截取;
function substr_cut($user_name){
$strlen= mb_strlen($user_name, 'utf-8');
$firstStr= mb_substr($user_name, 0, 1, 'utf-8');
$lastStr= mb_substr($user_name, -1, 1, 'utf-8');
return $strlen== 2 ? $firstStr . str_repeat('*', mb_strlen($user_name, 'utf-8') - 1) : $firstStr . str_repeat("*", $strlen - 2) . $lastStr;
}