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<?php
class PageTemplater_Class {
/**
* A reference to an instance of this class.
*/
private static $instance;
/**
* The array of templates that this plugin tracks.
*/
public $templates;
public $templates_paths;
/**
* Returns an instance of this class.
*/
public static function get_instance() {
if ( null == self::$instance ) {
self::$instance = new self();
}
return self::$instance;
}
/**
* Initializes the plugin by setting filters and administration functions.
*/
public function __construct($templates, $templates_paths) {
$this->templates = array();
$this->templates_paths = array();
// Add a filter to the attributes metabox to inject template into the cache.
if ( version_compare( floatval( get_bloginfo( 'version' ) ), '4.7', '<' ) ) {
// 4.6 and older
add_filter(
'page_attributes_dropdown_pages_args',
array( $this, 'register_project_templates' )
);
} else {
// Add a filter to the wp 4.7 version attributes metabox
add_filter(
'theme_page_templates', array( $this, 'add_new_template' )
);
}
// Add a filter to the save post to inject out template into the page cache
add_filter(
'wp_insert_post_data',
array( $this, 'register_project_templates' )
);
// Add a filter to the template include to determine if the page has our
// template assigned and return it's path
add_filter(
'template_include',
array( $this, 'view_project_template')
);
// Add your templates to this arrays.
$this->templates = $templates;
$this->templates_paths = $templates_paths;
}
/**
* Adds our template to the page dropdown for v4.7+
*
*/
public function add_new_template( $posts_templates ) {
$posts_templates = array_merge( $posts_templates, $this->templates );
return $posts_templates;
}
/**
* Adds our template to the pages cache in order to trick WordPress
* into thinking the template file exists where it doens't really exist.
*/
public function register_project_templates( $atts ) {
// Create the key used for the themes cache
$cache_key = 'page_templates-' . md5( get_theme_root() . '/' . get_stylesheet() );
// Retrieve the cache list.
// If it doesn't exist, or it's empty prepare an array
$templates = wp_get_theme()->get_page_templates();
if ( empty( $templates ) ) {
$templates = array();
}
// New cache, therefore remove the old one
wp_cache_delete( $cache_key , 'themes');
// Now add our template to the list of templates by merging our templates
// with the existing templates array from the cache.
$templates = array_merge( $templates, $this->templates );
// Add the modified cache to allow WordPress to pick it up for listing
// available templates
wp_cache_add( $cache_key, $templates, 'themes', 1800 );
return $atts;
}
/**
* Checks if the template is assigned to the page
*/
public function view_project_template( $template ) {
// Get global post
global $post;
// Return template if post is empty
if ( ! $post ) {
return $template;
}
// Return default template if we don't have a custom one defined
if ( ! isset( $this->templates[get_post_meta(
$post->ID, '_wp_page_template', true
)] ) ) {
return $template;
}
$templates_path = $this->templates_paths[get_post_meta( $post->ID, '_wp_page_template', true )];
$file = $templates_path . '/index.php';
// Just to be safe, we check if the file exist first
if ( file_exists( $file ) ) {
return $file;
} else {
echo $file;
}
// Return template
return $template;
}
}