示例：
字符串截取法直线导轨滑台
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/** * 中间加密 字符串截取法 */public static function encryptTel($tel) { $new_tel = substr($tel, 0, 3).‘****‘.substr($tel, 7); return $new_tel;} |
替换字符串
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/** * 中间加密 替换字符串的子串 */public static function encryptTel($tel) { $new_tel = substr_replace($tel, ‘****‘, 3, 4); return $new_tel;} |
正则
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/** * 中间加密 用正则 */public static function encryptTel($tel) { $new_tel = preg_replace(‘/(\d{3})\d{4}(\d{4})/‘, ‘$1****$2‘, $tel); return $new_tel;} |
原文：https://www.cnblogs.com/furuihua/p/12826517.html