forms - How to run a php file on Visual Studio Code?

I am trying to run a basic php script that should take some info from a form and then create a file with the input content. I am using VS code, and I guess I spent more than 6 hours to figure out why my php script isn't working.

I have done the followings:

I have xampp installed, and my Apache server running. In settings.json, I have configured the executablepath key.

"php.validate.executablePath": "C:\\xampp\\php\\php.exe",
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In my folder, I have an HTML file that consists the following form:

<form action="test.php" onsubmit="file_handler()">
     Name: <input type="text" id="name"  name='name'><br>
     <div class="s">Text</div> <br><textarea maxlength="800"  id="suggestion" name='text'></textarea><br>
     <div class="span-ch"><span id="charNum"> </span> <span id="charText"></span></div><br>
     <input type="submit" value="Send">
        
</form> 
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In the same folder, I have a test.php file which contains the following script:

 <?php 

    if(isset($_GET['name']) && isset($_GET['text']))  {
        $filename = preg_replace('#[^A-Za-z0-9_-]#', '', $_GET['name']);
        $file = $_SERVER['DOCUMENT_ROOT']."/textfiles/$filename.txt";
        $f = fopen($file, 'w');
        fwrite($f, $_GET['text']);
        fclose($f);
        echo 'Success.';
    }  else  {
        echo 'Error.';
    }

    ?>
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When I hit the submit bottom, it redirects me to the.php file, but instead of running the script and creating the file, and tell me if it was created or not, on that page, it simply shows me the php script, like a html page.

This is what is shown to me on browser, instead of "Success" or "Error".

 <?php 

    if(isset($_GET['name']) && isset($_GET['text']))  {
        $filename = preg_replace('#[^A-Za-z0-9_-]#', '', $_GET['name']);
        $file = $_SERVER['DOCUMENT_ROOT']."/textfiles/$filename.txt";
        $f = fopen($file, 'w');
        fwrite($f, $_GET['text']);
        fclose($f);
        echo 'Success.';
    }  else  {
        echo 'Error.';
    }

    ?>
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It might be a newbie question, because I am a beginner. I searched for answers on internet, and nothing.

NOTE: If I run my script on my console, it's working.

[Running] php ".......\Project1\test.php"

    Error.
[Done] exited with code=0 in 0.474 seconds
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Which means that the executable is found.

Please, can somebody help me? I much appreciate your time! Have a nice day!

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