How To Replace Some Characters With Asterisks

Question

I have a simple task to do with PHP, but since I\'m not familiar with Regular Expression or something... I have no clue what I\'m going to do.

what I want is very si

Answer 1

You'll need a specific function for each. For mails:

function hide_mail($email) {
    $mail_segments = explode("@", $email);
    $mail_segments[0] = str_repeat("*", strlen($mail_segments[0]));

    return implode("@", $mail_segments);
}

echo hide_mail("example@gmail.com");

For phone numbers

function hide_phone($phone) {
    return substr($phone, 0, -4) . "****";
}

echo hide_phone("1234567890");

And see? Not a single regular expression used. These functions don't check for validity though. You'll need to determine what kind of string is what, and call the appropriate function.

Answer 2

I tried for a single-regex solution but don't think it's possible due to the variable-length asterisks. Perhaps something like this:

function anonymiseString($str)
{
  if(is_numeric($str))
  {
     $str = preg_replace('/^(\d*?)\d{4}$/', '$1****');
  }
  elseif(($until = strpos($str, '@')) !== false)
  {
     $str = str_repeat('*', $until) . substr($str, $until + 1);
  }
  return $str;
}

Answer 3

I create one function to do this, works fine for me. i hope help.

function ofuscaEmail($email, $domain_ = false){

    $seg = explode('@', $email);
    $user = '';
    $domain = '';

    if (strlen($seg[0]) > 3) {
        $sub_seg = str_split($seg[0]);
        $user .= $sub_seg[0].$sub_seg[1];
        for ($i=2; $i < count($sub_seg)-1; $i++) { 
            if ($sub_seg[$i] == '.') {
                $user .= '.';
            }else if($sub_seg[$i] == '_'){
                $user .= '_';
            }else{
                $user .= '*';
            }
        }
        $user .= $sub_seg[count($sub_seg)-1];
    }else{
        $sub_seg = str_split($seg[0]);
        $user .= $sub_seg[0];
        for ($i=1; $i < count($sub_seg); $i++) { 
            $user .= ($sub_seg[$i] == '.') ? '.' : '*';
        }
    }

    $sub_seg2 = str_split($seg[1]);
    $domain .= $sub_seg2[0];
    for ($i=1; $i < count($sub_seg2)-2; $i++) { 
        $domain .= ($sub_seg2[$i] == '.') ? '.' : '*';
    }

    $domain .= $sub_seg2[count($sub_seg2)-2].$sub_seg2[count($sub_seg2)-1];

    return ($domain_ == false) ? $user.'@'.$seg[1] : $user.'@'.$domain ;

}

Answer 4

For e-mails, this function preserves first letter:

function hideEmail($email)
{
    $parts = explode('@', $email);
    return substr($parts[0], 0, min(1, strlen($parts[0])-1)) . str_repeat('*', max(1, strlen($parts[0]) - 1)) . '@' . $parts[1];
}

hideEmail('hello@domain.com'); //  h****@domain.com
hideEmail('hi@domain.com');    //  h*@domain.com
hideEmail('h@domain.com');     //  *@domain.com