Dumping an array before items are set into it?

Sykoi

I'm honestly not sure how to explain this without an example, so I'm going to give an example:

Basically I need to be able to set various javascript-related variables, functions, etc. throughout my code - loading javascript, setting timers, etc. even as far into the page as the footer. Now, heres my problem - I want all the javascript centrally located in the header, like its supposed to be... But how would I pull this off?

I plan on setting these javascript variables and such through a class (In PHP), and the data will be added into an array - I just need to figure out how to empty that array using a function in the same class, before the variables are set (But yet printing those variables).

It is incredibly confusing, so I'll attempt to write an example:

<?php
$js->dump_array();

(General PHP code)

$js->add_var("test", $test);

(More PHP code)

$js->add_var("test2", $test2);

etc.
?>

I'd need test, and test2 to be dumped from the array, before they're even set... I know I could use some mutilated form of ob_start() (Unless I'm misusing it and this was its designed function), but theres got to be a better way.

Piranha

As far as I know it is impossible to use something before it is set.

And I don't understand why you need to set various variables through the script. When I build web pages I always use this basic structure:

<?php
  // Do everything that needs PHP, like reading from database, insert into database and everything else
  $sql = "select row1, row2 from table where name = $name";
  $result = mysql_query($sql);
?>

// Then do all html, and where you need it use the results from queries and loops

<html>
<head>
<title>Test page</title>
</head>
<body>
<h1>Database results</h1>
<?php
while ($row = mysql_fetch_row($result)) {
  echo $row['row1'] . " " . $row['row2'] . "<br/>";
}
?>
</body>
</html>

That way you always have the variables in the beginning, and you don't need the kind of solutions that you want.