[Solved] PHP: get the value of TEXTBOX then pass it into a file

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If you want PHP to process the form, a PHP file must be invoked (not the text file you want to write to, that comes later). In the PHP file, POST and GET logic must be separated; a GET request will show the form, a POST request will invoke a handler and write to your text file.

<html><!-- Common header for GET and POST responses-->
<head>
    <title>Write a File</title>
</head>
<body>
<?php // enter PHP Parsing mode

if (!$_POST) {   //no POST has occurred, show the form

?>

<form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="POST"> 
<input type="text" name="name">
<input type="submit" value="scrivi sul file">
</form>

<?php
} else { // a form *has* been POSTed
?
   // sanitize the var $_POST['name'] with a basic filter
   $A  = filter_input(INPUT_POST,'name',FILTER_SANITIZE_STRING);

   // append the sanitized input to our text file
   $fp = file_put_contents('prova.txt', $A, FILE_APPEND);

   // give feedback to the user
   if ($fp) {
       echo "File written successfully";
   } else {
       echo "Problem writing file.";
   }
}
//escape from PHP mode
?>
<!-- this is a common footer for both GET and POST responses -->
</body>
</html>

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solved PHP: get the value of TEXTBOX then pass it into a file