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< ? php
/**
* Twenty Fourteen Featured Content
*
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* This module allows you to define a subset of posts to be displayed
* in the theme ' s Featured Content area .
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*
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* For maximum compatibility with different methods of posting users
* will designate a featured post tag to associate posts with . Since
* this tag now has special meaning beyond that of a normal tags , users
* will have the ability to hide it from the front - end of their site .
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*/
class Featured_Content {
/**
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* The maximum number of posts a Featured Content area can contain .
*
* We define a default value here but themes can override
* this by defining a " max_posts " entry in the second parameter
* passed in the call to add_theme_support ( 'featured-content' ) .
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*
* @ see Featured_Content :: init ()
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*
* @ since Twenty Fourteen 1.0
*
* @ static
* @ access public
* @ var int
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*/
public static $max_posts = 15 ;
/**
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* Instantiate .
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*
* All custom functionality will be hooked into the " init " action .
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*
* @ static
* @ access public
* @ since Twenty Fourteen 1.0
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*/
public static function setup () {
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add_action ( 'init' , array ( __CLASS__ , 'init' ), 30 );
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}
/**
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* Conditionally hook into WordPress .
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*
* Theme must declare that they support this module by adding
* add_theme_support ( 'featured-content' ); during after_setup_theme .
*
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* If no theme support is found there is no need to hook into WordPress .
* We ' ll just return early instead .
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*
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* @ static
* @ access public
* @ since Twenty Fourteen 1.0
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*/
public static function init () {
$theme_support = get_theme_support ( 'featured-content' );
// Return early if theme does not support Featured Content.
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if ( ! $theme_support ) {
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return ;
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}
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/*
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* An array of named arguments must be passed as the second parameter
* of add_theme_support () .
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*/
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if ( ! isset ( $theme_support [ 0 ] ) ) {
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return ;
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}
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// Return early if "featured_content_filter" has not been defined.
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if ( ! isset ( $theme_support [ 0 ][ 'featured_content_filter' ] ) ) {
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return ;
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}
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$filter = $theme_support [ 0 ][ 'featured_content_filter' ];
// Theme can override the number of max posts.
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if ( isset ( $theme_support [ 0 ][ 'max_posts' ] ) ) {
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self :: $max_posts = absint ( $theme_support [ 0 ][ 'max_posts' ] );
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}
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add_filter ( $filter , array ( __CLASS__ , 'get_featured_posts' ) );
add_action ( 'customize_register' , array ( __CLASS__ , 'customize_register' ), 9 );
add_action ( 'admin_init' , array ( __CLASS__ , 'register_setting' ) );
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add_action ( 'switch_theme' , array ( __CLASS__ , 'delete_transient' ) );
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add_action ( 'save_post' , array ( __CLASS__ , 'delete_transient' ) );
add_action ( 'delete_post_tag' , array ( __CLASS__ , 'delete_post_tag' ) );
add_action ( 'customize_controls_enqueue_scripts' , array ( __CLASS__ , 'enqueue_scripts' ) );
add_action ( 'pre_get_posts' , array ( __CLASS__ , 'pre_get_posts' ) );
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add_action ( 'wp_loaded' , array ( __CLASS__ , 'wp_loaded' ) );
}
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/**
* Hide " featured " tag from the front - end .
*
* Has to run on wp_loaded so that the preview filters of the customizer
* have a chance to alter the value .
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*
* @ static
* @ access public
* @ since Twenty Fourteen 1.0
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*/
public static function wp_loaded () {
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if ( self :: get_setting ( 'hide-tag' ) ) {
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add_filter ( 'get_terms' , array ( __CLASS__ , 'hide_featured_term' ), 10 , 3 );
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add_filter ( 'get_the_terms' , array ( __CLASS__ , 'hide_the_featured_term' ), 10 , 3 );
}
}
/**
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* Get featured posts .
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*
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* @ static
* @ access public
* @ since Twenty Fourteen 1.0
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*
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* @ return array Array of featured posts .
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*/
public static function get_featured_posts () {
$post_ids = self :: get_featured_post_ids ();
// No need to query if there is are no featured posts.
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if ( empty ( $post_ids ) ) {
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return array ();
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}
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$featured_posts = get_posts ( array (
'include' => $post_ids ,
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'posts_per_page' => count ( $post_ids ),
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) );
return $featured_posts ;
}
/**
* Get featured post IDs
*
* This function will return the an array containing the
* post IDs of all featured posts .
*
* Sets the " featured_content_ids " transient .
*
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* @ static
* @ access public
* @ since Twenty Fourteen 1.0
*
* @ return array Array of post IDs .
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*/
public static function get_featured_post_ids () {
// Return array of cached results if they exist.
$featured_ids = get_transient ( 'featured_content_ids' );
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if ( ! empty ( $featured_ids ) ) {
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return array_map ( 'absint' , ( array ) $featured_ids );
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}
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$settings = self :: get_setting ();
// Return sticky post ids if no tag name is set.
$term = get_term_by ( 'name' , $settings [ 'tag-name' ], 'post_tag' );
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if ( $term ) {
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$tag = $term -> term_id ;
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} else {
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return self :: get_sticky_posts ();
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}
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// Query for featured posts.
$featured = get_posts ( array (
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'numberposts' => self :: $max_posts ,
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'tax_query' => array (
array (
'field' => 'term_id' ,
'taxonomy' => 'post_tag' ,
'terms' => $tag ,
),
),
) );
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// Return array with sticky posts if no Featured Content exists.
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if ( ! $featured ) {
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return self :: get_sticky_posts ();
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}
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// Ensure correct format before save/return.
$featured_ids = wp_list_pluck ( ( array ) $featured , 'ID' );
$featured_ids = array_map ( 'absint' , $featured_ids );
set_transient ( 'featured_content_ids' , $featured_ids );
return $featured_ids ;
}
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/**
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* Return an array with IDs of posts maked as sticky .
*
* @ static
* @ access public
* @ since Twenty Fourteen 1.0
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*
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* @ return array Array of sticky posts .
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*/
public static function get_sticky_posts () {
$settings = self :: get_setting ();
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return array_slice ( get_option ( 'sticky_posts' , array () ), 0 , self :: $max_posts );
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}
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/**
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* Delete featured content ids transient .
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*
* Hooks in the " save_post " action .
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*
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* @ see Featured_Content :: validate_settings () .
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*
* @ static
* @ access public
* @ since Twenty Fourteen 1.0
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*/
public static function delete_transient () {
delete_transient ( 'featured_content_ids' );
}
/**
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* Exclude featured posts from the home page blog query .
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*
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* Filter the home page posts , and remove any featured post ID ' s from it .
* Hooked onto the 'pre_get_posts' action , this changes the parameters of
* the query before it gets any posts .
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*
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* @ static
* @ access public
* @ since Twenty Fourteen 1.0
*
* @ param WP_Query $query WP_Query object .
* @ return WP_Query Possibly - modified WP_Query .
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*/
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public static function pre_get_posts ( $query ) {
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// Bail if not home or not main query.
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if ( ! $query -> is_home () || ! $query -> is_main_query () ) {
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return ;
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}
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$page_on_front = get_option ( 'page_on_front' );
// Bail if the blog page is not the front page.
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if ( ! empty ( $page_on_front ) ) {
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return ;
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}
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$featured = self :: get_featured_post_ids ();
// Bail if no featured posts.
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if ( ! $featured ) {
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return ;
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}
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// We need to respect post ids already in the blacklist.
$post__not_in = $query -> get ( 'post__not_in' );
if ( ! empty ( $post__not_in ) ) {
$featured = array_merge ( ( array ) $post__not_in , $featured );
$featured = array_unique ( $featured );
}
$query -> set ( 'post__not_in' , $featured );
}
/**
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* Reset tag option when the saved tag is deleted .
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*
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* It ' s important to mention that the transient needs to be deleted ,
* too . While it may not be obvious by looking at the function alone ,
* the transient is deleted by Featured_Content :: validate_settings () .
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*
* Hooks in the " delete_post_tag " action .
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*
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* @ see Featured_Content :: validate_settings () .
*
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* @ static
* @ access public
* @ since Twenty Fourteen 1.0
*
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* @ param int $tag_id The term_id of the tag that has been deleted .
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*/
public static function delete_post_tag ( $tag_id ) {
$settings = self :: get_setting ();
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if ( empty ( $settings [ 'tag-id' ] ) || $tag_id != $settings [ 'tag-id' ] ) {
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return ;
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}
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$settings [ 'tag-id' ] = 0 ;
$settings = self :: validate_settings ( $settings );
update_option ( 'featured-content' , $settings );
}
/**
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* Hide featured tag from displaying when global terms are queried from the front - end .
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*
* Hooks into the " get_terms " filter .
*
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* @ static
* @ access public
* @ since Twenty Fourteen 1.0
*
* @ param array $terms List of term objects . This is the return value of get_terms () .
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* @ param array $taxonomies An array of taxonomy slugs .
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* @ return array A filtered array of terms .
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*
* @ uses Featured_Content :: get_setting ()
*/
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public static function hide_featured_term ( $terms , $taxonomies , $args ) {
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// This filter is only appropriate on the front-end.
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if ( is_admin () ) {
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return $terms ;
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}
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// We only want to hide the featured tag.
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if ( ! in_array ( 'post_tag' , $taxonomies ) ) {
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return $terms ;
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}
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// Bail if no terms were returned.
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if ( empty ( $terms ) ) {
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return $terms ;
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}
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// Bail if term objects are unavailable.
if ( 'all' != $args [ 'fields' ] ) {
return $terms ;
}
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$settings = self :: get_setting ();
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foreach ( $terms as $order => $term ) {
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if ( ( $settings [ 'tag-id' ] === $term -> term_id || $settings [ 'tag-name' ] === $term -> name ) && 'post_tag' === $term -> taxonomy ) {
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unset ( $terms [ $order ] );
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}
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}
return $terms ;
}
/**
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* Hide featured tag from display when terms associated with a post object
* are queried from the front - end .
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*
* Hooks into the " get_the_terms " filter .
*
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* @ static
* @ access public
* @ since Twenty Fourteen 1.0
*
* @ param array $terms A list of term objects . This is the return value of get_the_terms () .
* @ param int $id The ID field for the post object that terms are associated with .
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* @ param array $taxonomy An array of taxonomy slugs .
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* @ return array Filtered array of terms .
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*
* @ uses Featured_Content :: get_setting ()
*/
public static function hide_the_featured_term ( $terms , $id , $taxonomy ) {
// This filter is only appropriate on the front-end.
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if ( is_admin () ) {
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return $terms ;
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}
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// Make sure we are in the correct taxonomy.
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if ( 'post_tag' != $taxonomy ) {
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return $terms ;
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}
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// No terms? Return early!
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if ( empty ( $terms ) ) {
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return $terms ;
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}
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$settings = self :: get_setting ();
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foreach ( $terms as $order => $term ) {
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if ( ( $settings [ 'tag-id' ] === $term -> term_id || $settings [ 'tag-name' ] === $term -> name ) && 'post_tag' === $term -> taxonomy ) {
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unset ( $terms [ $term -> term_id ] );
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}
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}
return $terms ;
}
/**
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* Register custom setting on the Settings -> Reading screen .
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*
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* @ static
* @ access public
* @ since Twenty Fourteen 1.0
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*/
public static function register_setting () {
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register_setting ( 'featured-content' , 'featured-content' , array ( __CLASS__ , 'validate_settings' ) );
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}
/**
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* Add settings to the Customizer .
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*
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* @ static
* @ access public
* @ since Twenty Fourteen 1.0
*
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* @ param WP_Customize_Manager $wp_customize Theme Customizer object .
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*/
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public static function customize_register ( $wp_customize ) {
$wp_customize -> add_section ( 'featured_content' , array (
'title' => __ ( 'Featured Content' , 'twentyfourteen' ),
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'description' => sprintf ( __ ( 'Use a <a href="%1$s">tag</a> to feature your posts. If no posts match the tag, <a href="%2$s">sticky posts</a> will be displayed instead.' , 'twentyfourteen' ),
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esc_url ( add_query_arg ( 'tag' , _x ( 'featured' , 'featured content default tag slug' , 'twentyfourteen' ), admin_url ( 'edit.php' ) ) ),
admin_url ( 'edit.php?show_sticky=1' )
),
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'priority' => 130 ,
'theme_supports' => 'featured-content' ,
) );
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// Add Featured Content settings.
$wp_customize -> add_setting ( 'featured-content[tag-name]' , array (
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'default' => _x ( 'featured' , 'featured content default tag slug' , 'twentyfourteen' ),
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'type' => 'option' ,
'sanitize_js_callback' => array ( __CLASS__ , 'delete_transient' ),
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) );
$wp_customize -> add_setting ( 'featured-content[hide-tag]' , array (
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'default' => true ,
'type' => 'option' ,
'sanitize_js_callback' => array ( __CLASS__ , 'delete_transient' ),
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) );
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// Add Featured Content controls.
$wp_customize -> add_control ( 'featured-content[tag-name]' , array (
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'label' => __ ( 'Tag Name' , 'twentyfourteen' ),
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'section' => 'featured_content' ,
'priority' => 20 ,
) );
$wp_customize -> add_control ( 'featured-content[hide-tag]' , array (
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'label' => __ ( 'Don’t display tag on front end.' , 'twentyfourteen' ),
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'section' => 'featured_content' ,
'type' => 'checkbox' ,
'priority' => 30 ,
) );
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}
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/**
* Enqueue the tag suggestion script .
*
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* @ static
* @ access public
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* @ since Twenty Fourteen 1.0
*/
public static function enqueue_scripts () {
wp_enqueue_script ( 'featured-content-suggest' , get_template_directory_uri () . '/js/featured-content-admin.js' , array ( 'jquery' , 'suggest' ), '20131022' , true );
}
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/**
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* Get featured content settings .
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*
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* Get all settings recognized by this module . This function
* will return all settings whether or not they have been stored
* in the database yet . This ensures that all keys are available
* at all times .
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*
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* In the event that you only require one setting , you may pass
* its name as the first parameter to the function and only that
* value will be returned .
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*
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* @ static
* @ access public
* @ since Twenty Fourteen 1.0
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*
* @ param string $key The key of a recognized setting .
* @ return mixed Array of all settings by default . A single value if passed as first parameter .
*/
public static function get_setting ( $key = 'all' ) {
$saved = ( array ) get_option ( 'featured-content' );
$defaults = array (
'hide-tag' => 1 ,
'tag-id' => 0 ,
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'tag-name' => _x ( 'featured' , 'featured content default tag slug' , 'twentyfourteen' ),
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);
$options = wp_parse_args ( $saved , $defaults );
$options = array_intersect_key ( $options , $defaults );
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if ( 'all' != $key ) {
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return isset ( $options [ $key ] ) ? $options [ $key ] : false ;
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}
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return $options ;
}
/**
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* Validate featured content settings .
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*
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* Make sure that all user supplied content is in an expected
* format before saving to the database . This function will also
* delete the transient set in Featured_Content :: get_featured_content () .
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*
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* @ static
* @ access public
* @ since Twenty Fourteen 1.0
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*
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* @ param array $input Array of settings input .
* @ return array Validated settings output .
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*/
public static function validate_settings ( $input ) {
$output = array ();
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if ( empty ( $input [ 'tag-name' ] ) ) {
$output [ 'tag-id' ] = 0 ;
} else {
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$term = get_term_by ( 'name' , $input [ 'tag-name' ], 'post_tag' );
if ( $term ) {
$output [ 'tag-id' ] = $term -> term_id ;
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} else {
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$new_tag = wp_create_tag ( $input [ 'tag-name' ] );
if ( ! is_wp_error ( $new_tag ) && isset ( $new_tag [ 'term_id' ] ) ) {
$output [ 'tag-id' ] = $new_tag [ 'term_id' ];
}
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}
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$output [ 'tag-name' ] = $input [ 'tag-name' ];
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}
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$output [ 'hide-tag' ] = isset ( $input [ 'hide-tag' ] ) && $input [ 'hide-tag' ] ? 1 : 0 ;
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// Delete the featured post ids transient.
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self :: delete_transient ();
return $output ;
}
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} // Featured_Content
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Featured_Content :: setup ();