I want to pass php variable value as a action to html form. I am trying as follows, but it is not working.
<?php
    $url='test.php';
?>
<html>
    <body>
        <form name="upload" action="<?=$url?>" method="post" >
            <input type="submit" value="submit">
        </form>
    </body>
</html>
All this code are in one php file.
Have you tried <?php echo $url ?> 
If it works, then short_open_tag in the php.ini is turned off. That means you will need to either turn it on or use the long open tag <?php throughout your code.
Sounds like you need to enable short_open_tag if your example doesn't work.
<?php
    ini_set('short_open_tag', 'on');
    $url='test.php';
?>
<html>
    <body>
        <form name="upload" action="<?=$url?>" method="post" >
            <input type="submit" value="submit">
        </form>
    </body>
</html>
Alternately, write it like this:
<?php
    $url='test.php';
?>
<html>
    <body>
        <form name="upload" action="<?php echo $url ?>" method="post" >
            <input type="submit" value="submit">
        </form>
    </body>
</html>
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