将信箱的某一段替换为

将邮箱的某一段替换为*
将邮箱地址的第3 位到'@'之间的字符串替换为符号'*' 谢谢
------解决方案--------------------

echo preg_replace('/(?<=.{3}).+@/', '*@', [email protected]');

[email protected]
------解决方案--------------------

$str ="[email protected]";
$sub = substr($str, 2,strpos($str,'@') -2);
$len = strlen($sub);
$replaceStr = str_repeat('*',$len);
$newStr = str_replace($sub, $replaceStr, $str);
var_dump($newStr);