PHP method to implement the function of hiding the middle four digits of mobile phone numbers

PHP method to implement the function of hiding the middle four digits of mobile phone numbers

When developing a website or application, sometimes it is necessary to hide and protect the user’s mobile phone number User privacy. One common approach is to hide the middle four digits of a mobile phone number and only display the first three and last four digits. This article will introduce how to use PHP to achieve this function and provide specific code examples.

Implementation idea:

1. First, get the mobile phone number entered by the user;
2. Then, replace the middle four digits of the mobile phone number with *;
3. Finally, output the hidden mobile phone number.

The following is a simple PHP function that implements the function of hiding the middle four digits of a mobile phone number:

function hidePhoneNumber($phoneNumber) {
    // 判断手机号码长度是否为11位
    if(strlen($phoneNumber) != 11) {
        return "Invalid phone number";
    }

    // 将手机号中间四位替换为*
    $hiddenNumber = substr($phoneNumber, 0, 3) . '****' . substr($phoneNumber, -4);

    return $hiddenNumber;
}

// 调用函数，隐藏手机号中间四位
$phoneNumber = '13812345678'; // 假设用户输入的手机号为13812345678
$hiddenPhoneNumber = hidePhoneNumber($phoneNumber);

echo $hiddenPhoneNumber; // 输出隐藏后的手机号：138****5678

In the above code, the hidePhoneNumber() function Receive a mobile phone number as a parameter, first determine whether the length of the mobile phone number is 11 digits, then use the substr() function to replace the middle four digits of the mobile phone number with *, and finally return the hidden mobile phone number.

Using this function, you can easily implement the function of hiding the middle four digits of the mobile phone number during development, effectively protecting the user's private information. Hope the above code helps you!

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