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Conditional script for a WordPress page

I am trying to include some JavaScript to just one single page of a WordPress based website. Basically, what I've done is in the header.php of the theme, I've put the following:
<?php if( is_page('17')) { ?>
<!--Start of Zopim Live Chat Script-->
<script type="text/javascript">
window.$zopim||(function(d,s){var z=$zopim=function(c){z._.push(c)},$=z.s=
d.createElement(s),e=d.getElementsByTagName(s)[0];z.set=function(o){z.set.
_.push(o)};z._=[];z.set._=[];$.async=!0;$.setAttribute("charset","utf-8");
$.src="//v2.zopim.com/?2pL2gooCVnWNWjh0QB7IVqRgAiarsW4o";z.t=+new Date;$.
type="text/javascript";e.parentNode.insertBefore($,e)})(document,"script");
</script>
<!--End of Zopim Live Chat Script-->
<?php }
<?php endif; ?>
When I add this, it breaks the entire site, nothing loads anywhere. I've tried it with and without the
<?php endif; ?>
at the end, thinking that it may be duplicating with the
<?php }
I actually have two different conditional statements I need to add, each for a different page. I don't want to use the plugin that allows PHP & JavaScript in the pages themselves for security reasons, which is what I used to use.
Can anyone tell me what I'm doing wrong, and/or how to add this particular JavaScript to only page #17 (which I'm guessing will also show me how to add a PHP statement and link to single-use stylesheet that I need on a different page)?

It's hard to give a definite answer without seeing the rest of the page code but in my opinion you don't need the <?php endif; ?>.
Simply replace
<?php }
<?php endif; ?>
with
<?php } ?>
and it should work.

Obfuscate javascript generated by PHP

I have an audioplayer running on my website.
Currently there's no problem with the player although I wish to obfuscate my javascript code.
The problem is that the javascript is called on a page which includes a php file.
the player.php contains:
<script type="text/javascript">
$(function(){
$('.player').plate({
playlist: [
<?php
include ('inc/trackimport.inc.php');
?>
]
});
});
</script>
And trackimport generates (in a foreach for each $dj found in the database):
echo '{"title":"'.$dj.'", "artist":"'.$set.'", "cover":"http://domain.com/'.$imglink.'", "file":"http://domain.com/'.$djurl.'/Archive/'.$url.'"},';
Is there away to make this full code obfuscated?

Your best bet would be to use one of these PHP-based JavaScript minifiers. It's basically the same effect, but you can probably put in a configuration flag to make one of them run only when you want it.

Placing Javascript ad zone in PHP function

I am trying to place a javascript ad zone inside a php function. I am doing this to control what ad zones are placed on each page. Currently in the php template I am using:
<?php
if(is_page('welcome-president')) {
oiopub_banner_zone(9);
oiopub_banner_zone(19);
}
?>
I am trying to place this javascript code inside the if conditional tag instead of the oiopub_banner_zone(9); so that the ads will not be cached and rotate.
<script type="text/javascript" src="http://rutgers.myuvn.com/wp-content/plugins/oiopub-direct/js.php#type=banner&align=center&zone=9"></script>
Thanks in advance!

Rather than call the function oiopub_banner_zone(9) to display the banner code, you can just replace that function call with echo and the actual script tag that you would like to output on the page.
<?php
if(is_page('welcome-president')) {
echo '<script type="text/javascript" src="http://rutgers.myuvn.com/wp-content/plugins/oiopub-direct/js.php#type=banner&align=center&zone=9"></script>';
oiopub_banner_zone(19);
}
?>

If you want to prevent caching. Make an that points to some place in your site ( e.g. /ad_iframe.php ) and do the rotate logic to retrieve the add content there. That will not get cached.
There was a post about it that helped me a lot.
Preventing iframe caching in browser
Good luck, and cheers.

Add margin-left, script inside php

The problem is. I want to inset margin-left: 20%; to maincontent, when the user is logged in.
No i dont have a problem with syntax, i can get it done in js, but im told to use php.
So i also added a class in css and to my body.
<?php
if ($_SESSION['username']){
include("/view/leftmenu.php");
}
?>
How do i activate css in php?

As revealed by the syntax highlighting, you're trying to put a single quote inside a single-quoted string.
Your options are:
Escape the single quotes with \'.
Use double quotes instead.
Use ?> ... <?php instead of echo.
Don't do this with JavaScript at all! You control the server side; why not just add a class to the body like logged-in, and have a CSS rule like body.logged-in #maincontent { margin-left: 20%; }?
(For what it's worth your JavaScript is invalid too; you need to quote the 20%. Percentages aren't legal JS.)

Put your JavaScript in double quotes, with single quotes inside. You may want to run your include first as well. include does not need (). Your code could look more like:
<?php
session_start(); // has to be run before any headers are sent
if(isset($_SESSION['username'])){
include '/view/leftmenu.php';
echo "<script type='text/javascript'>$('#maincontent').css('margin-left', '20%');</script>";
}
?>
The better solution however would look more like:
<?php
session_start(); $marginLeft = '0'; // $marginLeft should be your default
if(isset($_SESSION['username'])){
$marginLeft = '20%';
include '/view/leftmenu.php';
}
echo "<!DOCTYPE html><html><head><style type='text/css'>".
"#maincontent{margin-left:$marginLeft;}</style></head><body>".
"<div id='maincontent'>content</div></body></html>";
?>
A better approach yet, would look like:
<?php
session_start(); $className = 'withoutMargin'; // $marginLeft should be your default
if(isset($_SESSION['username'])){
$className = 'withMargin';
include '/view/leftmenu.php';
}
?>
<!DOCTYPE html>
<html>
<head>
<style type='text/css'>
.withoutMargin{
margin-left:0;
}
.withMargin{
margin-left:20%;
}
</style>
</head>
<body>
<?php echo " <div class='$className'>"; ?>
<!-- your content here -->
</div>
</body>
</html>
Note: Your code above does not have to look exactly like this. This just illustrates concept. You would have more code testing for submit to be set and so forth. Also, with the second example, which I recommend, I would use external CSS, so it is cached by the user's Browser.

20% needs to be in quotes:
$('#maincontent').css('margin-left', '20%');
This also applies to px, em, pt, and any other form of CSS unit of measurement.

Strategy for moving javascript to the bottom in CodeIgniter?

On my site I have one global Javascript file which includes jQuery and code for the drop down menu among other things. Many pages also have custom Javascript for minor page-specific interactions, tables etc.
My current set up on each view is a header.php file, basically covering everything from the doctype through to start of the content, the view file for the specific page, and a footer.php closing out the page.
Currently global.js is linked from the <head>. For performance we should put JS at the very bottom of the page, but I can't figure out a good way to do this. I could add the full script line for global.js with the custom script block, but that means I must add it on every page, even when there is no other Javascript. Any better way to move the JS right to the bottom?

You could put the custom JS in a regular variable or nowdoc (php 5.3.0+), and then echo the variable along with script tags in the footer if it exists. Nowdoc might be preferable because you can use both double quotes and single quotes in your JS and PHP won't parse/escape the text.
someview.php:
<?php
$custom_js = "
alert('custom js ran');
";
?>
<?php
$custom_js = <<<'CUSTOM_JS'
alert("custom js ran (i'm in a nowdoc!)");
CUSTOM_JS;
?>
footer.php:
<?php if(isset($custom_js)) { ?>
<script><?php echo $custom_js; ?></script>
<?php } ?>
Edit 2:
If you don't want to have the javascript in a string, you could have the javascript in a seperate file and then use PHP's file_get_contents() to load it into the $custom_js variable as a string.
Edit:
This is just an aside, but you might look into using the Carabiner library for loading JS and CSS. It's an excellent library. It might not necessarily help with your current problem, but if your global.js is quite large, you could split it up and use Carabiner to compress/concatenate on load. I currently use it to select which JS and CSS gets loaded for logged in and logged out users on my current CI project.
Carabiner on Github
Carabiner on Sparks
Carabiner documentation

Perhaps I missed something - but why cant you just load another view, which only contains the js code?
Your template:
$this->load->view("header.php");
$this->load->view("content.php", $data);
$this->load->view("footer.php", $load_js);
Then inside footer.php:
// start of footer stuff here
$this->load->view($load_js);
</body>
</html>
Then inside page1.php:
<script>
// Your scripts here
</script>
OR:
Your template:
$this->load->view("header.php");
$this->load->view("content.php", $data);
Then inside each "content.php" file:
// Content goes here
$data['load_js'] = "page1.php";
$this->load->view("footer.php", $data);
Then inside single "footer.php" file:
// start of footer stuff here
$this->load->view($load_js);
</body>
</html>
Then inside page1.php:
<script>
// Your scripts here
</script>
The second method is probably more what you want. It does mean you need to call the footer in each content file - but it is literally one line - so your not really repeating yourself - but it gives you complete control inside the content file to specifically any js files to load.
You can expand this an make the $load_js variable an array of js files to load.

I use a set of layouts, which are views that provide the basic structure of the site. Every controller calls a layout and passes into it the content specific for that controller method.
For example, say you have a single layout:
<html>
<head>
<title><?php echo $page->title ?></title>
<?php if (count($page->css)): ?>
<?php for ($i=0; $i < count($page->css); $i++): ?>
<link rel="stylesheet" href="<?php echo $page->css[$i] ?>"/>
<?php endfor; ?>
<?php endif; ?>
</head>
<body>
<?php $this->load->view('header.php'); ?>
<?php $this->load->view($content); ?>
<?php $this->load->view('footer.php'); ?>
<?php if (count($page->js)): ?>
<?php for ($i=0; $i < count($page->js); $i++): ?>
<script src="<?php echo $page->js[$i] ?>"></script>
<?php endfor; ?>
<?php endif; ?>
</body>
</html>
Each page passes in a $page object that contains an array of css and js files. For files that are global, like global.js, you can just hardcode that in at the bottom (same with global CSS at the top). Or, you can set a parent controller that all controllers inherit from. This way you can set up the $page object with default settings (including adding global.js). Then, each controller/method can remove global.js if it's not needed.
Each page also passes in a $content variable with the location of the main view for the page.
You can extend this even further by having multiple layouts and moving some of the HTML into the layout (e.g. 1 column, 2 column, 3 column layouts). In those cases, you may pass in multiple view locations for each column, etc. It's really up to you.
Of course, to keep all JS at the bottom you'd need to move all your page-specific custom JS into JS files. That's actually the best way to go, considering external JS can be cached.

Make a helper function; and load a view where you include that global.js script. Anytime you need global.js to be located at the bottom of the page, just call that helper function.

Another option is to use a template library.
I use this one by Williams Concepts.
It allows you to add JS (and CSS for that matter) for individual class/method calls.
For example:
class foo exends Controller {
public function bar() {
$this->template->add_js('js/jquery.js');
$this->template->add_js('alert("Hello!");', 'embed');
$data = $this->some_model->get_data();
$this->template->write_view('content', 'user/profile', $data;
$this->template->render();
}
}
Using this you can either add the JS as and when required, or add it into the template for the site.
In your case, I would either add the global.js in the footer of the template or define a region in the footer of the template when you can add any JS required.

Controller / add function
public function add()
{
$data['page_title'] = 'Test | Add Details';
$data['js'] = array('details','details2');
$this->load->view('template/header',$data);
$this->load->view('details/add');
$this->load->view('template/footer',$data);
}
in your footer template load all the common scripts that are needed, like jquery.min.js, bootstrap.min.js and so on. later add the below code
footer
<!-- Jquery Core Js -->
<script src="<?= base_url() ?>assets/plugins/jquery/jquery.min.js"></script>
<!-- Bootstrap Core Js -->
<script src="<?= base_url() ?>assets/plugins/bootstrap/js/bootstrap.js"></script>
<?php
if(isset($js) && count($js) > 0)
{
for($i=0;$i<count($js);$i++)
{
?>
<script src="<?= base_url() ?>assets/js/custom/<?= $js[$i] ?>.js"></script>
<?php
}
}
?>
</body>
</html>
pass all the js files to be loaded in the array.

If you have a footer.php file that's included on everypage, why can't you just put your js code in that file?