Question

How to add values from <input> to $var in php file?

html

<input type="text" id="align" name="align"/>

php file

<?php
  $align="center";
?>

Answer 1

You mean you want to post it and put it in a PHP variable?

Try this:

<form action="somephpfile.php" method="POST">
    <input type="text" name="align" value="center" />
    <input type="submit" value="Send!" />
</form>

somephpfile.php

    $align = $_POST['align'];
    echo $align;