wp-content/themes/twentyfifteen/functions.php
<?php
/**
* Twenty Fifteen functions and definitions
*
* Set up the theme and provides some helper functions, which are used in the
* theme as custom template tags. Others are attached to action and filter
* hooks in WordPress to change core functionality.
*
* When using a child theme you can override certain functions (those wrapped
* in a function_exists() call) by defining them first in your child theme's
* functions.php file. The child theme's functions.php file is included before
* the parent theme's file, so the child theme functions would be used.
*
* @link https://developer.wordpress.org/themes/basics/theme-functions/
* @link https://developer.wordpress.org/themes/advanced-topics/child-themes/
*
* Functions that are not pluggable (not wrapped in function_exists()) are
* instead attached to a filter or action hook.
*
* For more information on hooks, actions, and filters,
* {@link https://developer.wordpress.org/plugins/}
*
* @package WordPress
* @subpackage Twenty_Fifteen
* @since Twenty Fifteen 1.0
*/
/**
* Set the content width based on the theme's design and stylesheet.
*
* @since Twenty Fifteen 1.0
*/
if ( ! isset( $content_width ) ) {
$content_width = 660;
}
/**
* Twenty Fifteen only works in WordPress 4.1 or later.
*/
if ( version_compare( $GLOBALS['wp_version'], '4.1-alpha', '<' ) ) {
require get_template_directory() . '/inc/back-compat.php';
}
if ( ! function_exists( 'twentyfifteen_setup' ) ) :
/**
* Sets up theme defaults and registers support for various WordPress features.
*
* Note that this function is hooked into the after_setup_theme hook, which
* runs before the init hook. The init hook is too late for some features, such
* as indicating support for post thumbnails.
*
* @since Twenty Fifteen 1.0
*/
function twentyfifteen_setup() {
/*
* Make theme available for translation.
* Translations can be filed at WordPress.org. See: https://translate.wordpress.org/projects/wp-themes/twentyfifteen
* If you're building a theme based on twentyfifteen, use a find and replace
* to change 'twentyfifteen' to the name of your theme in all the template files.
*
* Manual loading of text domain is not required after the introduction of
* just in time translation loading in WordPress version 4.6.
*
* @ticket 58318
*/
if ( version_compare( $GLOBALS['wp_version'], '4.6', '<' ) ) {
load_theme_textdomain( 'twentyfifteen' );
}
// Add default posts and comments RSS feed links to head.
add_theme_support( 'automatic-feed-links' );
/*
* Let WordPress manage the document title.
* By adding theme support, we declare that this theme does not use a
* hard-coded <title> tag in the document head, and expect WordPress to
* provide it for us.
*/
add_theme_support( 'title-tag' );
/*
* Enable support for Post Thumbnails on posts and pages.
*
* See: https://developer.wordpress.org/reference/functions/add_theme_support/#post-thumbnails
*/
add_theme_support( 'post-thumbnails' );
set_post_thumbnail_size( 825, 510, true );
// This theme uses wp_nav_menu() in two locations.
register_nav_menus(
array(
'primary' => __( 'Primary Menu', 'twentyfifteen' ),
'social' => __( 'Social Links Menu', 'twentyfifteen' ),
)
);
/*
* Switch default core markup for search form, comment form, and comments
* to output valid HTML5.
*/
add_theme_support(
'html5',
array(
'search-form',
'comment-form',
'comment-list',
'gallery',
'caption',
'script',
'style',
'navigation-widgets',
)
);
/*
* Enable support for Post Formats.
*
* See: https://developer.wordpress.org/advanced-administration/wordpress/post-formats/
*/
add_theme_support(
'post-formats',
array(
'aside',
'image',
'video',
'quote',
'link',
'gallery',
'status',
'audio',
'chat',
)
);
/*
* Enable support for custom logo.
*
* @since Twenty Fifteen 1.5
*/
add_theme_support(
'custom-logo',
array(
'height' => 248,
'width' => 248,
'flex-height' => true,
)
);
$color_scheme = twentyfifteen_get_color_scheme();
$default_color = trim( $color_scheme[0], '#' );
// Setup the WordPress core custom background feature.
add_theme_support(
'custom-background',
/**
* Filters Twenty Fifteen custom-background support arguments.
*
* @since Twenty Fifteen 1.0
*
* @param array $args {
* An array of custom-background support arguments.
*
* @type string $default-color Default color of the background.
* @type string $default-attachment Default attachment of the background.
* }
*/
apply_filters(
'twentyfifteen_custom_background_args',
array(
'default-color' => $default_color,
'default-attachment' => 'fixed',
)
)
);
/*
* This theme styles the visual editor to resemble the theme style,
* specifically font, colors, icons, and column width. When fonts are
* self-hosted, the theme directory needs to be removed first.
*/
$font_stylesheet = str_replace(
array( get_template_directory_uri() . '/', get_stylesheet_directory_uri() . '/' ),
'',
(string) twentyfifteen_fonts_url()
);
add_editor_style( array( 'css/editor-style.css', 'genericons/genericons.css', $font_stylesheet ) );
// Load regular editor styles into the new block-based editor.
add_theme_support( 'editor-styles' );
// Load default block styles.
add_theme_support( 'wp-block-styles' );
// Add support for responsive embeds.
add_theme_support( 'responsive-embeds' );
// Add support for custom color scheme.
add_theme_support(
'editor-color-palette',
array(
array(
'name' => __( 'Dark Gray', 'twentyfifteen' ),
'slug' => 'dark-gray',
'color' => '#111',
),
array(
'name' => __( 'Light Gray', 'twentyfifteen' ),
'slug' => 'light-gray',
'color' => '#f1f1f1',
),
array(
'name' => __( 'White', 'twentyfifteen' ),
'slug' => 'white',
'color' => '#fff',
),
array(
'name' => __( 'Yellow', 'twentyfifteen' ),
'slug' => 'yellow',
'color' => '#f4ca16',
),
array(
'name' => __( 'Dark Brown', 'twentyfifteen' ),
'slug' => 'dark-brown',
'color' => '#352712',
),
array(
'name' => __( 'Medium Pink', 'twentyfifteen' ),
'slug' => 'medium-pink',
'color' => '#e53b51',
),
array(
'name' => __( 'Light Pink', 'twentyfifteen' ),
'slug' => 'light-pink',
'color' => '#ffe5d1',
),
array(
'name' => __( 'Dark Purple', 'twentyfifteen' ),
'slug' => 'dark-purple',
'color' => '#2e2256',
),
array(
'name' => __( 'Purple', 'twentyfifteen' ),
'slug' => 'purple',
'color' => '#674970',
),
array(
'name' => __( 'Blue Gray', 'twentyfifteen' ),
'slug' => 'blue-gray',
'color' => '#22313f',
),
array(
'name' => __( 'Bright Blue', 'twentyfifteen' ),
'slug' => 'bright-blue',
'color' => '#55c3dc',
),
array(
'name' => __( 'Light Blue', 'twentyfifteen' ),
'slug' => 'light-blue',
'color' => '#e9f2f9',
),
)
);
// Add support for custom color scheme.
add_theme_support(
'editor-gradient-presets',
array(
array(
'name' => __( 'Dark Gray Gradient', 'twentyfifteen' ),
'slug' => 'dark-gray-gradient-gradient',
'gradient' => 'linear-gradient(90deg, rgba(17,17,17,1) 0%, rgba(42,42,42,1) 100%)',
),
array(
'name' => __( 'Light Gray Gradient', 'twentyfifteen' ),
'slug' => 'light-gray-gradient',
'gradient' => 'linear-gradient(90deg, rgba(241,241,241,1) 0%, rgba(215,215,215,1) 100%)',
),
array(
'name' => __( 'White Gradient', 'twentyfifteen' ),
'slug' => 'white-gradient',
'gradient' => 'linear-gradient(90deg, rgba(255,255,255,1) 0%, rgba(230,230,230,1) 100%)',
),
array(
'name' => __( 'Yellow Gradient', 'twentyfifteen' ),
'slug' => 'yellow-gradient',
'gradient' => 'linear-gradient(90deg, rgba(244,202,22,1) 0%, rgba(205,168,10,1) 100%)',
),
array(
'name' => __( 'Dark Brown Gradient', 'twentyfifteen' ),
'slug' => 'dark-brown-gradient',
'gradient' => 'linear-gradient(90deg, rgba(53,39,18,1) 0%, rgba(91,67,31,1) 100%)',
),
array(
'name' => __( 'Medium Pink Gradient', 'twentyfifteen' ),
'slug' => 'medium-pink-gradient',
'gradient' => 'linear-gradient(90deg, rgba(229,59,81,1) 0%, rgba(209,28,51,1) 100%)',
),
array(
'name' => __( 'Light Pink Gradient', 'twentyfifteen' ),
'slug' => 'light-pink-gradient',
'gradient' => 'linear-gradient(90deg, rgba(255,229,209,1) 0%, rgba(255,200,158,1) 100%)',
),
array(
'name' => __( 'Dark Purple Gradient', 'twentyfifteen' ),
'slug' => 'dark-purple-gradient',
'gradient' => 'linear-gradient(90deg, rgba(46,34,86,1) 0%, rgba(66,48,123,1) 100%)',
),
array(
'name' => __( 'Purple Gradient', 'twentyfifteen' ),
'slug' => 'purple-gradient',
'gradient' => 'linear-gradient(90deg, rgba(103,73,112,1) 0%, rgba(131,93,143,1) 100%)',
),
array(
'name' => __( 'Blue Gray Gradient', 'twentyfifteen' ),
'slug' => 'blue-gray-gradient',
'gradient' => 'linear-gradient(90deg, rgba(34,49,63,1) 0%, rgba(52,75,96,1) 100%)',
),
array(
'name' => __( 'Bright Blue Gradient', 'twentyfifteen' ),
'slug' => 'bright-blue-gradient',
'gradient' => 'linear-gradient(90deg, rgba(85,195,220,1) 0%, rgba(43,180,211,1) 100%)',
),
array(
'name' => __( 'Light Blue Gradient', 'twentyfifteen' ),
'slug' => 'light-blue-gradient',
'gradient' => 'linear-gradient(90deg, rgba(233,242,249,1) 0%, rgba(193,218,238,1) 100%)',
),
)
);
// Indicate widget sidebars can use selective refresh in the Customizer.
add_theme_support( 'customize-selective-refresh-widgets' );
}
endif; // twentyfifteen_setup()
add_action( 'after_setup_theme', 'twentyfifteen_setup' );
/**
* Register widget area.
*
* @since Twenty Fifteen 1.0
*
* @link https://developer.wordpress.org/reference/functions/register_sidebar/
*/
function twentyfifteen_widgets_init() {
register_sidebar(
array(
'name' => __( 'Widget Area', 'twentyfifteen' ),
'id' => 'sidebar-1',
'description' => __( 'Add widgets here to appear in your sidebar.', 'twentyfifteen' ),
'before_widget' => '<aside id="%1$s" class="widget %2$s">',
'after_widget' => '</aside>',
'before_title' => '<h2 class="widget-title">',
'after_title' => '</h2>',
)
);
}
add_action( 'widgets_init', 'twentyfifteen_widgets_init' );
if ( ! function_exists( 'twentyfifteen_fonts_url' ) ) :
/**
* Register fonts for Twenty Fifteen.
*
* @since Twenty Fifteen 1.0
* @since Twenty Fifteen 3.4 Replaced Google URL with self-hosted fonts.
*
* @return string Fonts URL for the theme.
*/
function twentyfifteen_fonts_url() {
$fonts_url = '';
$fonts = array();
/*
* translators: If there are characters in your language that are not supported
* by Noto Sans, translate this to 'off'. Do not translate into your own language.
*/
if ( 'off' !== _x( 'on', 'Noto Sans font: on or off', 'twentyfifteen' ) ) {
$fonts[] = 'noto-sans';
}
/*
* translators: If there are characters in your language that are not supported
* by Noto Serif, translate this to 'off'. Do not translate into your own language.
*/
if ( 'off' !== _x( 'on', 'Noto Serif font: on or off', 'twentyfifteen' ) ) {
$fonts[] = 'noto-serif';
}
/*
* translators: If there are characters in your language that are not supported
* by Inconsolata, translate this to 'off'. Do not translate into your own language.
*/
if ( 'off' !== _x( 'on', 'Inconsolata font: on or off', 'twentyfifteen' ) ) {
$fonts[] = 'inconsolata';
}
if ( $fonts ) {
$fonts_url = get_template_directory_uri() . '/assets/fonts/' . implode( '-plus-', $fonts ) . '.css';
}
return $fonts_url;
}
endif;
/**
* JavaScript Detection.
*
* Adds a `js` class to the root `<html>` element when JavaScript is detected.
*
* @since Twenty Fifteen 1.1
*/
function twentyfifteen_javascript_detection() {
echo "<script>(function(html){html.className = html.className.replace(/\bno-js\b/,'js')})(document.documentElement);</script>\n";
}
add_action( 'wp_head', 'twentyfifteen_javascript_detection', 0 );
/**
* Enqueue scripts and styles.
*
* @since Twenty Fifteen 1.0
*/
function twentyfifteen_scripts() {
// Add custom fonts, used in the main stylesheet.
$font_version = ( 0 === strpos( (string) twentyfifteen_fonts_url(), get_template_directory_uri() . '/' ) ) ? '20230328' : null;
wp_enqueue_style( 'twentyfifteen-fonts', twentyfifteen_fonts_url(), array(), $font_version );
// Add Genericons, used in the main stylesheet.
wp_enqueue_style( 'genericons', get_template_directory_uri() . '/genericons/genericons.css', array(), '20201026' );
// Load our main stylesheet.
wp_enqueue_style( 'twentyfifteen-style', get_stylesheet_uri(), array(), '20240402' );
// Theme block stylesheet.
wp_enqueue_style( 'twentyfifteen-block-style', get_template_directory_uri() . '/css/blocks.css', array( 'twentyfifteen-style' ), '20240210' );
// Register the Internet Explorer specific stylesheet.
wp_register_style( 'twentyfifteen-ie', get_template_directory_uri() . '/css/ie.css', array( 'twentyfifteen-style' ), '20220908' );
wp_style_add_data( 'twentyfifteen-ie', 'conditional', 'lt IE 9' );
// Register the Internet Explorer 7 specific stylesheet.
wp_register_style( 'twentyfifteen-ie7', get_template_directory_uri() . '/css/ie7.css', array( 'twentyfifteen-style' ), '20141210' );
wp_style_add_data( 'twentyfifteen-ie7', 'conditional', 'lt IE 8' );
// Skip-link fix is no longer enqueued by default.
wp_register_script( 'twentyfifteen-skip-link-focus-fix', get_template_directory_uri() . '/js/skip-link-focus-fix.js', array(), '20230526', array( 'in_footer' => true ) );
if ( is_singular() && comments_open() && get_option( 'thread_comments' ) ) {
wp_enqueue_script( 'comment-reply' );
}
if ( is_singular() && wp_attachment_is_image() ) {
wp_enqueue_script( 'twentyfifteen-keyboard-image-navigation', get_template_directory_uri() . '/js/keyboard-image-navigation.js', array( 'jquery' ), '20141210' );
}
wp_enqueue_script(
'twentyfifteen-script',
get_template_directory_uri() . '/js/functions.js',
array( 'jquery' ),
'20221101',
array(
'in_footer' => false, // Because involves header.
'strategy' => 'defer',
)
);
wp_localize_script(
'twentyfifteen-script',
'screenReaderText',
array(
/* translators: Hidden accessibility text. */
'expand' => '<span class="screen-reader-text">' . __( 'expand child menu', 'twentyfifteen' ) . '</span>',
/* translators: Hidden accessibility text. */
'collapse' => '<span class="screen-reader-text">' . __( 'collapse child menu', 'twentyfifteen' ) . '</span>',
)
);
}
add_action( 'wp_enqueue_scripts', 'twentyfifteen_scripts' );
/**
* Enqueue styles for the block-based editor.
*
* @since Twenty Fifteen 2.1
*/
function twentyfifteen_block_editor_styles() {
// Block styles.
wp_enqueue_style( 'twentyfifteen-block-editor-style', get_template_directory_uri() . '/css/editor-blocks.css', array(), '20240117' );
// Add custom fonts.
$font_version = ( 0 === strpos( (string) twentyfifteen_fonts_url(), get_template_directory_uri() . '/' ) ) ? '20230328' : null;
wp_enqueue_style( 'twentyfifteen-fonts', twentyfifteen_fonts_url(), array(), $font_version );
}
add_action( 'enqueue_block_editor_assets', 'twentyfifteen_block_editor_styles' );
/**
* Add preconnect for Google Fonts.
*
* @since Twenty Fifteen 1.7
* @deprecated Twenty Fifteen 3.4 Disabled filter because, by default, fonts are self-hosted.
*
* @param array $urls URLs to print for resource hints.
* @param string $relation_type The relation type the URLs are printed.
* @return array URLs to print for resource hints.
*/
function twentyfifteen_resource_hints( $urls, $relation_type ) {
if ( wp_style_is( 'twentyfifteen-fonts', 'queue' ) && 'preconnect' === $relation_type ) {
if ( version_compare( $GLOBALS['wp_version'], '4.7-alpha', '>=' ) ) {
$urls[] = array(
'href' => 'https://fonts.gstatic.com',
'crossorigin',
);
} else {
$urls[] = 'https://fonts.gstatic.com';
}
}
return $urls;
}
// add_filter( 'wp_resource_hints', 'twentyfifteen_resource_hints', 10, 2 );
/**
* Add featured image as background image to post navigation elements.
*
* @since Twenty Fifteen 1.0
*
* @see wp_add_inline_style()
*/
function twentyfifteen_post_nav_background() {
if ( ! is_single() ) {
return;
}
$previous = ( is_attachment() ) ? get_post( get_post()->post_parent ) : get_adjacent_post( false, '', true );
$next = get_adjacent_post( false, '', false );
$css = '';
if ( is_attachment() && 'attachment' === $previous->post_type ) {
return;
}
if ( $previous && has_post_thumbnail( $previous->ID ) ) {
$prevthumb = wp_get_attachment_image_src( get_post_thumbnail_id( $previous->ID ), 'post-thumbnail' );
$css .= '
.post-navigation .nav-previous { background-image: url(' . esc_url( $prevthumb[0] ) . '); }
.post-navigation .nav-previous .post-title, .post-navigation .nav-previous a:hover .post-title, .post-navigation .nav-previous .meta-nav { color: #fff; }
.post-navigation .nav-previous a:before { background-color: rgba(0, 0, 0, 0.4); }
';
}
if ( $next && has_post_thumbnail( $next->ID ) ) {
$nextthumb = wp_get_attachment_image_src( get_post_thumbnail_id( $next->ID ), 'post-thumbnail' );
$css .= '
.post-navigation .nav-next { background-image: url(' . esc_url( $nextthumb[0] ) . '); border-top: 0; }
.post-navigation .nav-next .post-title, .post-navigation .nav-next a:hover .post-title, .post-navigation .nav-next .meta-nav { color: #fff; }
.post-navigation .nav-next a:before { background-color: rgba(0, 0, 0, 0.4); }
';
}
wp_add_inline_style( 'twentyfifteen-style', $css );
}
add_action( 'wp_enqueue_scripts', 'twentyfifteen_post_nav_background' );
/**
* Display descriptions in main navigation.
*
* @since Twenty Fifteen 1.0
*
* @param string $item_output The menu item's starting HTML output.
* @param WP_Post $item Menu item data object.
* @param int $depth Depth of the menu. Used for padding.
* @param stdClass $args An object of wp_nav_menu() arguments.
* @return string Menu item with possible description.
*/
function twentyfifteen_nav_description( $item_output, $item, $depth, $args ) {
if ( 'primary' === $args->theme_location && $item->description ) {
$item_output = str_replace( $args->link_after . '</a>', '<div class="menu-item-description">' . $item->description . '</div>' . $args->link_after . '</a>', $item_output );
}
return $item_output;
}
add_filter( 'walker_nav_menu_start_el', 'twentyfifteen_nav_description', 10, 4 );
/**
* Add a `screen-reader-text` class to the search form's submit button.
*
* @since Twenty Fifteen 1.0
*
* @param string $html Search form HTML.
* @return string Modified search form HTML.
*/
function twentyfifteen_search_form_modify( $html ) {
return str_replace( 'class="search-submit"', 'class="search-submit screen-reader-text"', $html );
}
add_filter( 'get_search_form', 'twentyfifteen_search_form_modify' );
/**
* Modifies tag cloud widget arguments to display all tags in the same font size
* and use list format for better accessibility.
*
* @since Twenty Fifteen 1.9
*
* @param array $args Arguments for tag cloud widget.
* @return array The filtered arguments for tag cloud widget.
*/
function twentyfifteen_widget_tag_cloud_args( $args ) {
$args['largest'] = 22;
$args['smallest'] = 8;
$args['unit'] = 'pt';
$args['format'] = 'list';
return $args;
}
add_filter( 'widget_tag_cloud_args', 'twentyfifteen_widget_tag_cloud_args' );
/**
* Prevents `author-bio.php` partial template from interfering with rendering
* an author archive of a user with the `bio` username.
*
* @since Twenty Fifteen 2.6
*
* @param string $template Template file.
* @return string Replacement template file.
*/
function twentyfifteen_author_bio_template( $template ) {
if ( is_author() ) {
$author = get_queried_object();
if ( $author instanceof WP_User && 'bio' === $author->user_nicename ) {
// Use author templates if exist, fall back to template hierarchy otherwise.
return locate_template( array( "author-{$author->ID}.php", 'author.php' ) );
}
}
return $template;
}
add_filter( 'author_template', 'twentyfifteen_author_bio_template' );
/**
* Implement the Custom Header feature.
*
* @since Twenty Fifteen 1.0
*/
require get_template_directory() . '/inc/custom-header.php';
/**
* Custom template tags for this theme.
*
* @since Twenty Fifteen 1.0
*/
require get_template_directory() . '/inc/template-tags.php';
/**
* Customizer additions.
*
* @since Twenty Fifteen 1.0
*/
require get_template_directory() . '/inc/customizer.php';
/**
* Block Patterns.
*
* @since Twenty Fifteen 3.0
*/
require get_template_directory() . '/inc/block-patterns.php';