如何在PHP中将URL变量传递给javascript

Question

I need to take a URL variable into a PHP page, and then later pass it into some javascript that's in HTML later in the page. Here's where I need to use the variable:

function dosubmit( ) {
new Ajax.Updater( 'result', 'dial.php', { method: 'post' , parameters: $('dialer').serialize() } );
$('dialer').reset();
}

the URL variable is formatted as dialout.php?ext=1234. It is stored in PHP as $ext. result is the div that returned html will be placed in, and dialer is a form that a user would enter a phone number into; I need to pass it along with the $ext variable to dial.php. My thought was to concatenate the two, as

var ext = "<? $uext ?>";
var par = $('dialer').serialize();
var url = par;

and then using url in place of $('dialer').serialize(). This does not work, though; dial.php reports never gets the ext variable. What's the best way to move a URL variable into PHP, then into js, then post it back to PHP? I apologize in advance if I've mis-explained something, this is all new to me.

Thanks!

Answer 1

You have the right idea, but you need to use a command like print or echo to populate the variable:

var ext = "<? echo $uext ?>";

Otherwise $uext by itself as a PHP statement effectively does nothing.

Also, you need to include the ext variable into your parameter list. Your current code as it stands doesn't make any further references to ext after it is populated:

var par = $('dialer').serialize();
par += '&ext=' + ext;