• 邮箱

<?php
$email = 邮箱代码;
$em = explode("@",$email);
$name = $em[0];
$len = strlen($name);
$showLen = floor($len/2);
$str_arr = str_split($name);
for($ii=$showLen;$ii<$len;$ii++){
    $str_arr[$ii] = '*';
}
$em[0] = implode('',$str_arr);
$new_name = implode('@',$em);
echo $new_name;?>

• 手机

<?php
$phone = '手机号码代码';
function hiddenPhoneNumber($phone, $start = 3, $length = 4)
{
    return substr_replace($phone, str_repeat('*', $length), $start, $length);
}
// 隐藏中间4位
// echo hiddenPhoneNumber($phone);

echo hiddenPhoneNumber($phone, 2, 5);?>