让用户id隐藏起来

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;
}