``` /** * 隱藏敏感字符 * @param $value * @return string */ function substr_cut($value) { $strlen = mb_strlen($value, 'utf-8'); if ($strlen <= 1) return $value; $firstStr = mb_substr($value, 0, 1, 'utf-8'); $lastStr = mb_substr($value, -1, 1, 'utf-8'); return $strlen == 2 ? $firstStr . str_repeat('*', $strlen - 1) : $firstStr . str_repeat("*", $strlen - 2) . $lastStr; } ``` ``` function hideStr($str) { $start = msubstr($str,0,1,'utf-8',false); $last = msubstr($str,-1,1,'utf-8',false); return $start.'***'.$last; } ``` ``` ~~~ //替換一部分字符 /** * @param $string 需要替換的字符串 * @param $start 開始的保留幾位 * @param $end 最后保留幾位 * @return string */ function strReplace($string,$start,$end) { $strlen = mb_strlen($string, 'UTF-8');//獲取字符串長度 $firstStr = mb_substr($string, 0, $start,'UTF-8');//獲取第一位 $lastStr = mb_substr($string, -1, $end, 'UTF-8');//獲取最后一位 return $strlen == 2 ? $firstStr . str_repeat('*', mb_strlen($string, 'utf-8') -1) : $firstStr . str_repeat("*", $strlen - 2) . $lastStr; } ~~~ ```