function obfuscate_email($email)
{
    $em   = explode("@",$email);
    $name = implode(array_slice($em, 0, count($em)-1), '@');
    $len  = floor(strlen($name)/2);

    return substr($name,0, $len) . str_repeat('*', $len) . "@" . end($em);   
}

// to see in action:
$emails = ['"Abc\@def"@iana.org', 'abcdlkjlkjk@hotmail.com'];

foreach ($emails as $email) 
{
    echo obfuscate_email($email) . "\n";
}

Vystup:

"Abc\*****@iana.org
abcdl*****@hotmail.com

Metoda2:

'.$email.'
'.mask_email($email).'
';
}

vystup:

a@a.com
*@*.com

ab@aa.com
**@**.com

abc@aaa.com
***@***.com

abcd@aaaa.com
ab*d@aa*a.com

abcde@aaaaa.com
ab**e@aa**a.com

abcdef@aaaaaa.com
ab***f@aa***a.com

abcdefg@aaaaaaa.com
ab****g@aa****a.com

abcdefgh@aaaaaaaa.com
ab*****h@aa*****a.com

abcdefghi@aaaaaaaaa.com
ab******i@aa******a.com

Zdroj:

https://stackoverflow.com/questions/20545301/partially-hide-email-address-in-php

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