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WordPress Meet HTML
by REFERDEAL
Article Source: Original

Overview
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Next, we have to tell WordPress about this new template. To achieve this we need to customize core PHP files. The idea is to piggy back on the logic that process single page, and display our new template if our marker exist.

  1. assign a new query parameter as a marker for new template
  2. parameter can be passed via session or query string
  3. in template-loader, branch to new template if we detect the presence of the specific marker

We designate z as the template marker. z can be passed into WP either via URL (http://.../?z=id) or in session ($SESSION['z'] = id). When we detect the presence of z (if isset('z')), this is the que to display the new template.

First, tell class WP that 'z' is a valid public query variable in class.php.

class WP {
/*-- wk --*/
// include z as part of public query vars
var $public_query_vars = array('z', 'm', 'p', 'posts', 'w', 'cat', 'withcomments', 's', 'search', 'exact', 'sentence', 'debug', 'calendar', 'page', 'paged', 'more', 'tb', 'pb', 'author', 'order', 'orderby', 'year', 'monthnum', 'day', 'hour', 'minute', 'second', 'name', 'category_name', 'feed', 'author_name', 'static', 'pagename', 'page_id', 'error', 'comments_popup', 'attachment', 'attachment_id', 'subpost', 'subpost_id');
/*-- == --*/

"single page" logic is activated when parameter 'p' is set. Here we intercept to initialize 'p' when we detect our template marker 'z' is set in class.php at the end of parse_request().

/*-- wk --*/
// parameter can also be set via session. we initialize query_vars here
// query_string _GET will take precedent over session data
if (isset($_SESSION[ 'z']) || !empty($_GET[ 'z'])) {

if(empty($_GET[ 'z']))
$this->query_vars[ 'z'] = $_SESSION[ 'z'];
$this->query_vars['p'] = $_SESSION[ 'z'];
}
/*-- == --*/

if ( isset($error) )
$this->query_vars['error'] = $error;
}

Lastly, when WP is about to display single_template in template-loader.php, we put in additional if-else statement where if our 'z' marker is set, we display z template, otherwise use the default single template.

} else if ( is_single() && get_single_template() ) {
if ( is_attachment() )
add_filter('the_content', 'prepend_attachment');

include(get_single_template());
exit;

/*-- wk --*/
// we piggy back on single_template logic and branch
// to new template if z is set in the query_vars
global $wp_query;
$wpvar = 'z';

if(isset($wp_query->query_vars['z'])) {
include(get_query_template('z'));
} else {
include(get_single_template());
exit;
}
/*-- == --*/

} else if ( is_page() && get_page_template() ) {

We are now ready to modify the static article HTML.

Step 3..