Description:
------------
Sometimes I encounter the strange behaviour that PHP does not add an 
<input type="hidden" name="PHPSESSID" value="6745etcetc" />
in forms having additional whitespaces in the <form>-tag.

I like to have forms readable and often write them like shown in tmplt_button_form.php below.

Sometimes it works; sometimes I have to strip all additional whitespaces from the opening <form>-tag to make PHP rewriting the HTML-output. 
Switching output-buffering on and off did not change the effect. Had the same phenomenon in PHP 4 before.

So my workaround for now is not to write
<form method="post" 
      action="[-- URL --]">

but 
<form method="post" action="[-- URL --]">

- Roland

Reproduce code:
---------------
// The method ...
function HTMLButton($url, $action, $comment)
{
    $file  = 'templates/tmplt_button_form.php';
    $tmplt = implode('', file($file));
    $replace = array(
           '[-- URL --]'     => htmlentities($url),
           '[-- ACTION --]'  => htmlentities($action),
           '[-- COMMENT --]' => htmlentities($comment)
    );
    echo strtr($tmplt, $replace);
}

-- The file tmplt_button_form.php: --

<form method="post" 
      action="[-- URL --]">
 <input type="hidden" 
        name="myaction" 
        value="[-- ACTION --]">
 <input type="submit" 
        value="[-- COMMENT --]">
</form>

Expected result:
----------------
<form method="post" 
      action="http://www.default.com"><input type="hidden" name="PHPSESSID" value="6745135150906f4748b27d0cbe43d99a" />
 <input type="hidden" 
        name="myaction" 
        value="someAction">
 <input type="submit" 
        value="Just do it!">
</form>

Actual result:
--------------
<form method="post" 
      action="http://www.default.com">
 <input type="hidden" 
        name="myaction" 
        value="someAction">
 <input type="submit" 
        value="Just do it!">
</form>