Php'de mailin ortasındaki harflerini gizleme hk.

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";
}

$mail ='deneme@gmail.com';
$patlat = explode('@',$mail);
$araUzunluk = (strlen($patlat[0]) -2);
$cikti = $patlat[0][0].str_repeat('*',$araUzunluk).$patlat[0][strlen($patlat[0])-1];
$cikti .= '@'.$patlat[1];
echo $cikti; // d****e@gmail.com