<?php

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/**

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* Post format functions.

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*

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* @package WordPress

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* @subpackage Post

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*/

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/**

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* Retrieve the format slug for a post

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*

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* @since 3.1.0

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*

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* @param int|WP_Post|null $post Optional. Post ID or post object. Defaults to the current post in the loop.

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* @return string|false The format if successful. False otherwise.

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*/

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function get_post_format( $post = null ) {

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$post = get_post( $post );

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if ( ! $post ) {

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return false;

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}

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if ( ! post_type_supports( $post->post_type, 'post-formats' ) ) {

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return false;

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}

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$_format = get_the_terms( $post->ID, 'post_format' );

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if ( empty( $_format ) ) {

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return false;

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}

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$format = reset( $_format );

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return str_replace( 'post-format-', '', $format->slug );

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}

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/**

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* Check if a post has any of the given formats, or any format.

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*

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* @since 3.1.0

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*

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* @param string|string[] $format Optional. The format or formats to check.

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* @param WP_Post|int|null $post Optional. The post to check. Defaults to the current post in the loop.

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* @return bool True if the post has any of the given formats (or any format, if no format specified),

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* false otherwise.

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*/

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function has_post_format( $format = array(), $post = null ) {

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$prefixed = array();

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if ( $format ) {

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foreach ( (array) $format as $single ) {

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$prefixed[] = 'post-format-' . sanitize_key( $single );

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}

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}

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return has_term( $prefixed, 'post_format', $post );

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}

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/**

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* Assign a format to a post

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*

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* @since 3.1.0

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*

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* @param int|object $post The post for which to assign a format.

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* @param string $format A format to assign. Use an empty string or array to remove all formats from the post.

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* @return array|WP_Error|false Array of affected term IDs on success. WP_Error on error.

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*/

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function set_post_format( $post, $format ) {

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$post = get_post( $post );

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if ( ! $post ) {

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return new WP_Error( 'invalid_post', __( 'Invalid post.' ) );

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}

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if ( ! empty( $format ) ) {

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$format = sanitize_key( $format );

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if ( 'standard' === $format || ! in_array( $format, get_post_format_slugs(), true ) ) {

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$format = '';

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} else {

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$format = 'post-format-' . $format;

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}

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}

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return wp_set_post_terms( $post->ID, $format, 'post_format' );

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}

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/**

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* Returns an array of post format slugs to their translated and pretty display versions

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*

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* @since 3.1.0

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*

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* @return string[] Array of post format labels keyed by format slug.

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*/

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function get_post_format_strings() {

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$strings = array(

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'standard' => _x( 'Standard', 'Post format' ), // Special case. Any value that evals to false will be considered standard.

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'aside' => _x( 'Aside', 'Post format' ),

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'chat' => _x( 'Chat', 'Post format' ),

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'gallery' => _x( 'Gallery', 'Post format' ),

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'link' => _x( 'Link', 'Post format' ),

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'image' => _x( 'Image', 'Post format' ),

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'quote' => _x( 'Quote', 'Post format' ),

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'status' => _x( 'Status', 'Post format' ),

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'video' => _x( 'Video', 'Post format' ),

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'audio' => _x( 'Audio', 'Post format' ),

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);

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return $strings;

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}

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/**

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* Retrieves the array of post format slugs.

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*

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* @since 3.1.0

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*

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* @return string[] The array of post format slugs as both keys and values.

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*/

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function get_post_format_slugs() {

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$slugs = array_keys( get_post_format_strings() );

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return array_combine( $slugs, $slugs );

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}

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/**

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* Returns a pretty, translated version of a post format slug

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*

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* @since 3.1.0

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*

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* @param string $slug A post format slug.

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* @return string The translated post format name.

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*/

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function get_post_format_string( $slug ) {

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$strings = get_post_format_strings();

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if ( ! $slug ) {

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return $strings['standard'];

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} else {

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return ( isset( $strings[ $slug ] ) ) ? $strings[ $slug ] : '';

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}

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}

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/**

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* Returns a link to a post format index.

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*

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* @since 3.1.0

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*

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* @param string $format The post format slug.

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* @return string|WP_Error|false The post format term link.

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*/

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function get_post_format_link( $format ) {

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$term = get_term_by( 'slug', 'post-format-' . $format, 'post_format' );

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if ( ! $term || is_wp_error( $term ) ) {

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return false;

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}

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return get_term_link( $term );

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}

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/**

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* Filters the request to allow for the format prefix.

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*

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* @access private

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* @since 3.1.0

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*

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* @param array $qvs

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* @return array

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*/

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function _post_format_request( $qvs ) {

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if ( ! isset( $qvs['post_format'] ) ) {

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return $qvs;

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}

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$slugs = get_post_format_slugs();

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if ( isset( $slugs[ $qvs['post_format'] ] ) ) {

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$qvs['post_format'] = 'post-format-' . $slugs[ $qvs['post_format'] ];

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}

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$tax = get_taxonomy( 'post_format' );

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if ( ! is_admin() ) {

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$qvs['post_type'] = $tax->object_type;

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}

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return $qvs;

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}

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/**

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* Filters the post format term link to remove the format prefix.

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*

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* @access private

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* @since 3.1.0

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*

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* @global WP_Rewrite $wp_rewrite WordPress rewrite component.

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*

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* @param string $link

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* @param WP_Term $term

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* @param string $taxonomy

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* @return string

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*/

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function _post_format_link( $link, $term, $taxonomy ) {

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global $wp_rewrite;

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if ( 'post_format' !== $taxonomy ) {

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return $link;

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}

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if ( $wp_rewrite->get_extra_permastruct( $taxonomy ) ) {

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return str_replace( "/{$term->slug}", '/' . str_replace( 'post-format-', '', $term->slug ), $link );

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} else {

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$link = remove_query_arg( 'post_format', $link );

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return add_query_arg( 'post_format', str_replace( 'post-format-', '', $term->slug ), $link );

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}

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}

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/**

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* Remove the post format prefix from the name property of the term object created by get_term().

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*

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* @access private

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* @since 3.1.0

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*

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* @param object $term

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* @return object

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*/

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function _post_format_get_term( $term ) {

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if ( isset( $term->slug ) ) {

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$term->name = get_post_format_string( str_replace( 'post-format-', '', $term->slug ) );

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}

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return $term;

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}

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/**

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* Remove the post format prefix from the name property of the term objects created by get_terms().

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*

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* @access private

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* @since 3.1.0

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*

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* @param array $terms

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* @param string|array $taxonomies

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* @param array $args

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* @return array

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*/

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function _post_format_get_terms( $terms, $taxonomies, $args ) {

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if ( in_array( 'post_format', (array) $taxonomies, true ) ) {

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if ( isset( $args['fields'] ) && 'names' === $args['fields'] ) {

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foreach ( $terms as $order => $name ) {

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$terms[ $order ] = get_post_format_string( str_replace( 'post-format-', '', $name ) );

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}

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} else {

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foreach ( (array) $terms as $order => $term ) {

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if ( isset( $term->taxonomy ) && 'post_format' === $term->taxonomy ) {

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$terms[ $order ]->name = get_post_format_string( str_replace( 'post-format-', '', $term->slug ) );

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}

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}

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}

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}

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return $terms;

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}

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/**

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* Remove the post format prefix from the name property of the term objects created by wp_get_object_terms().

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*

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* @access private

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* @since 3.1.0

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*

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* @param array $terms

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* @return array

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*/

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function _post_format_wp_get_object_terms( $terms ) {

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foreach ( (array) $terms as $order => $term ) {

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if ( isset( $term->taxonomy ) && 'post_format' === $term->taxonomy ) {

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$terms[ $order ]->name = get_post_format_string( str_replace( 'post-format-', '', $term->slug ) );

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}

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}

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return $terms;

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}

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