Please create a code that has the power to get all the passwords stored in the browser like Chrome, Edge, Internet Explorer, Opera and etc with all functions as online

<?php

function register() {
    if (isset($_POST['submit'])) {
        include_once 'dbh.inc.php';
        $first = mysqli_real_escape_string($conn, $_POST['first']);
        $last = mysqli_real_escape_string($conn, $_POST['last']);
        $email = mysqli_real_escape_string($conn, $_POST['email']);
        $uid = mysqli_real_escape_string($conn, $_POST['uid']);
        $pwd = mysqli_real_escape_string($conn, $_POST['pwd']);
    
            //Error handlers
            //Check for empty fields
            if (empty($first) && empty($last) && empty($email) && empty($uid) && empty($pwd)) {
                header("Location: ../signup.php?signup=empty");
                exit();
            } else {
                //Check if input characters are valid
                if (!preg_match("/^[a-zA