I need to obfuscate the characters of the email, as I have seen many websites doing, filling some characters of this email with an asterisk.
I would like the code to be as complete as possible.
Example:
'[email protected]' => 'wa*********[email protected]'
How to do this quite simply?
I thought of working very simply using the substr_replace function combined with strpos .
See:
$mail = '[email protected]'
substr_replace($mail, '*****', 1, strpos($mail, '@') - 2);
The result is
'w*****[email protected]'
The explanation of the code is as follows: The third argument ( 1 ) causes the position to be replaced to be from the first character. The fourth argument strpos($mail, '@') will give us the final position where it should be replaced, which is @ . In this case, I used -2 so that neither the @ nor the last character before it was replaced.
Replacement size will be determined from the starting position. If it were necessary to display 2 characters at the beginning and 2 before the @ , we would have to change the function as follows:
substr_replace($mail, '*****', 2, strpos($mail, '@') - 4);
You can use sub_str_replace() to figure out where and how many characters to replace and str_repeat() to generate the string that will replace the original email.
function ofuscaEmail($email, $inicio, $qtd){
$asc = str_repeat('*', $qtd);
return substr_replace($email, $asc, $inicio, $qtd);
}
$str = '[email protected]';
echo ofuscaEmail($str, 2, 8);
You can also do this through the preg_replace .
With regex below you can group the first two characters and the two characters before the @ .
^([\w_]{2})(.+)([\w_]{2}@)
With the power of regex you can create rules that are quite specific to your problem.
<?php
$pattern = "/^([\w_]{2})(.+)([\w_]{2}@)/u";
$replacement = "$1********$3";
$email = "[email protected]";
echo preg_replace($pattern, $replacement, $email);
//Output: wa********[email protected]
And with the same regex , you can also use the preg_replace_callback and work with more freedom using a specific function for a given problem.
<?php
function ocultarEmail($matches)
{
return $matches[1] .
str_repeat("*", strlen($matches[2])) .
$matches[3];
}
$pattern = "/^([\w_]{2})(.+)([\w_]{2}@)/u";
for($i = 1; $i <= 20; $i++) {
$email = str_repeat("a", $i)."@teste.com";
echo preg_replace_callback($pattern, 'ocultarEmail', $email);
echo PHP_EOL;
}