php 隐藏邮件中间四位或手机号后面的

/**
     * @param $email
     * @return string
     * 隐藏邮箱手机号
     */
    function mail_hidden($str)
    {
        if (strpos($str, '@')) {
            $email_array = explode("@", $str);

            if (strlen($email_array[0]) <= 2) {
                $prevfix =  substr_replace($email_array[0],'*',1,1);
                $rs = $prevfix.$email_array[1];
//                $prevfix = substr($str, 0, 1); //邮箱前缀
//                $count = 0;
//                $str = preg_replace('/([\d\w+_-]{0,100})@/', '*@', $str, -1, $count);
//                $rs = $prevfix . $str;
            } else if (strlen($email_array[0]) < 5 ){
                $prevfix =  substr_replace($email_array[0],'**',1,1);
               $rs = $prevfix.$email_array[1];
            } else {
                $prevfix =  substr_replace($email_array[0],'***',3,1);
                $rs = $prevfix.$email_array[1];
            }

        } else {
            $pattern = '/(1[3458]{1}[0-9])[0-9]{4}([0-9]{4})/i';
            if (preg_match($pattern, $str)) {
                $rs = preg_replace($pattern, '$1****$2', $str); // substr_replace($name,'****',3,4);
            } else {
                $rs = substr($str, 0, 3) . "***" . substr($str, -1);
            }
        }
        return $rs;

    }

好看点

   function mail_hidden($str)
    {
        if (strpos($str, '@')) {
            $email_array = explode("@", $str);

            if (strlen($email_array[0]) <= 1) {
//                $prevfix =  substr_replace($email_array[0],'*',1,1);
////                $rs = $prevfix.$email_array[1];
//                $prevfix = substr($str, 0, 1); //邮箱前缀
//                $count = 0;
//                $str = preg_replace('/([\d\w+_-]{0,100})@/', '*@', $str, -1, $count);
//                $rs = $prevfix . $str;
                $rs = $str;
            } else if (strlen($email_array[0]) < 5 ){
                $frist = substr( $email_array[0], 0, 1 );
                $last = substr( $email_array[0], -1, 1 );
               $rs = $frist.'****'.$last.$email_array[1];
            } else {
                $frist = substr( $email_array[0], 0, 2 );
                $last = substr($email_array[0],-2);
                $rs = $frist.'****'.$last.$email_array[1];
//                $prevfix =  substr_replace($email_array[0],'****',3,1);
//                $rs = $prevfix.$email_array[1];
            }

        } else {
            $pattern = '/(1[3458]{1}[0-9])[0-9]{4}([0-9]{4})/i';
            if (preg_match($pattern, $str)) {
                $rs = preg_replace($pattern, '$1****$2', $str); // substr_replace($name,'****',3,4);
            } else {
                $rs = substr($str, 0, 3) . "***" . substr($str, -1);
            }
        }
        return $rs;

    }
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转载自blog.csdn.net/qq_27229113/article/details/103033753