PHP in Browser Write , Read and Update . txt , Locally

Question

In Client Browser ! Locally...

How can I create and save to a file . txt local on the client machine the value of two variables String .

This script is in the login and whenever the login is done this file is updated "overwritten" locally in the client’s machine passing updated values of these variables.

And then at another point in the script, read what’s in that file. txt "the value of the two variables previously entered and updated" and compare each of these values with two other variables in my script.

How can I accomplish this process ?

.TXT

$strGuarda01
$strGuarda02

$strCompara01 == $strGuarda01
$strCompara02 == $strGuarda02

Answer 1

I believe that is not possible , because your PHP code is on a server outside the directory where you want to make file modifications, so the browser cannot make the change.

Answer 2

I’ll try to explain half on top. I hope you understand:

To Save the Data:

<script>
    localStorage.setItem('strGuarda01', '<?php echo $strGuarda01;?>');  
    localStorage.setItem('strGuarda02', '$strGuarda02');
</script>

In order to recover this data you can send it to php in the following way:

<script>
    var strGuarda01 = localStorage.getItem('strGuarda01'), strGuarda02= localStorage.getItem('strGuarda02');
    $.POST('login.php', {'strGuarda01':strGuarda01,'strGuarda02':strGuarda02}, function(data){
      ...
    }
</script>

And recovers on page . php:

<?php
    $strGuarda01 = $_POST['strGuarda01'];
    $strGuarda01= $_POST['strGuarda02'];
    ...
?>

And to update:

<script>
    localStorage.clear();
    localStorage.setItem('strGuarda01', '<?php echo $strGuarda01;?>');  
    localStorage.setItem('strGuarda02', '$strGuarda02');
</script>

localStorage

localStorage saves data on the visitor’s computer, which is linked to (and only accessible by) their domain.

This tutorial may help you: https://zenorocha.com/html5-local-storage/