How are these PHP function applied to a specific page in WordPress? -

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i'm new php , trying understand practical ways.

i'm getting of what's going on in following code, of http://www.php.net , http://codex.wordpress.org/function_reference/.

in current situation, 1 page on site triggers popup form if no cookie set. functionality specified within code?

here's functions: 

if (isset($_post['confirm']) && isset($_post['location'])) {      setcookie("location", $_post['location'], time()+3600);      } elseif (!isset($_cookie["location"])) {     setcookie("location", "", 1); } elseif (isset($_post['deny'])) {     setcookie("location", "", 1); }  // popup confirmation  function show_popup($content) {     global $post;     $location = get_post_meta($post->id, 'location', true);     if (strtolower($l) == strtolower($location) || strlen($location) == 0        || (isset($_cookie["location"]) && strtolower($_cookie["location"])       == strtolower($location))) {         return $content;     } else {         ?>         <div id="popup">     <p>foo.</p>     <p>yes/no?</p>     <form action="<?php echo $php_self ?>" method="post">     <input type="hidden" name="location" value="<?php echo $location; ?>" />     <input type="submit" name="confirm" value="yes" />     <input type="submit" name="deny" value="no" />     </form>     </div>         <?php     } } add_filter('the_content', 'show_popup');  // adds content <head> tag function add_meta_content() { if(isset($_post['deny'])) { ?> <meta http-equiv="refresh" content="0;url=<?php bloginfo ('wpurl') ?>"> <?php } if(isset($_post['confirm'])) { ?> <meta http-equiv="refresh" content="0;url=<?php echo $php_self; ?>"> <?php }  } add_action('wp_head', 'add_meta_content');

it's if statement in show_popup function.

it either returns $content (ie. nothing) or outputs form.

if current post has meta field called location that's not 0 characters long, , there's not cookie matching location, output form.


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