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编辑：custom-functions.php

<?php
/**
 * Custom avada functions.
 *
 * @author     ThemeFusion
 * @copyright  (c) Copyright by ThemeFusion
 * @link       https://avada.com
 * @package    Avada
 * @subpackage Core
 */

// Do not allow directly accessing this file.
if ( ! defined( 'ABSPATH' ) ) {
	exit( 'Direct script access denied.' );
}

if ( ! function_exists( 'avada_get_slider' ) ) {
	/**
	 * Get the slider type.
	 *
	 * @param int    $post_id    The post ID.
	 * @param string $type       The slider type.
	 * @param bool   $is_archive Whether archive page.
	 * @return  string
	 */
	function avada_get_slider( $post_id, $type, $is_archive = false ) {
		$type = Avada_Helper::slider_name( $type );
		if ( $type ) {
			return ( $is_archive ) ? fusion_data()->term_meta( $post_id )->get( $type ) : fusion_data()->post_meta( $post_id )->get( $type );
		}
		return false;
	}
}

if ( ! function_exists( 'avada_slider' ) ) {
	/**
	 * Slider.
	 *
	 * @param int   $post_id           The post ID.
	 * @param bool  $is_archive        Whether archive page.
	 * @param array $visibility_values Visibility values for slider.
	 */
	function avada_slider( $post_id, $is_archive = false, $visibility_values = [] ) {

$slider_type = Avada_Helper::get_slider_type( $post_id, $is_archive );
		$slider      = avada_get_slider( $post_id, $slider_type, $is_archive );

if ( $slider ) {
			$slider_name = Avada_Helper::slider_name( $slider_type );
			$slider_name = ( 'slider' === $slider_name ) ? 'layerslider' : $slider_name;

$function = 'avada_' . $slider_name;

$function( $slider );
		}
	}
}

if ( ! function_exists( 'avada_slider_visibility' ) ) {
	/**
	 * Slider visibility.
	 *
	 * @param string $visibility_values  The visibility values.
	 * @param string $visibility_options The visibility options.
	 */
	function avada_slider_visibility( $visibility_values, $visibility_options ) {
		$class = 'fusion-slider-visibility';

foreach ( $visibility_options as $visibility_option ) {
			if ( ! in_array( $visibility_option, $visibility_values ) ) { // phpcs:ignore WordPress.PHP.StrictInArray.MissingTrueStrict
				$class .= ' fusion-no-' . $visibility_option;
			}
		}

return $class;
	}
}

if ( ! function_exists( 'avada_revslider' ) ) {
	/**
	 * Slider Revolution.
	 *
	 * @param string $name The Slider Revolution slider name.
	 */
	function avada_revslider( $name ) {

// We use include() instead of get_template_part() to pass the $name.
		include locate_template( 'templates/revslider.php' );
	}
}

if ( ! function_exists( 'avada_layerslider' ) ) {
	/**
	 * Layerslider.
	 *
	 * @param int|string $id The layerslider ID.
	 */
	function avada_layerslider( $id ) {

// We use include() instead of get_template_part() to pass the $id.
		include locate_template( 'templates/layerslider.php' );
	}
}

if ( ! function_exists( 'avada_elasticslider' ) ) {
	/**
	 * The elastic-slider.
	 *
	 * @param int|string $term The term.
	 */
	function avada_elasticslider( $term ) {

// We use include() instead of get_template_part() to pass the $term.
		include locate_template( 'templates/elasticslider.php' );
	}
}

if ( ! function_exists( 'avada_wooslider' ) ) {
	/**
	 * Per-term slider.
	 *
	 * @param int|string $term The term.
	 */
	function avada_wooslider( $term ) {
		if ( method_exists( 'Fusion_Slider', 'render_fusion_slider' ) ) {
			Fusion_Slider::render_fusion_slider( $term );
		}
	}
}

if ( ! function_exists( 'avada_current_page_title_bar' ) ) {
	/**
	 * Get the current page title.
	 *
	 * @param int|string $post_id The post ID.
	 */
	function avada_current_page_title_bar( $post_id = false ) {
		$post_id = $post_id ? $post_id : Avada()->fusion_library->get_page_id();

if ( ! apply_filters( 'awb_should_render_page_title_bar', true, $post_id ) ) {
			return;
		}

if ( has_action( 'avada_override_current_page_title_bar' ) ) {
			do_action( 'avada_override_current_page_title_bar', $post_id );
		} elseif ( 'hide' !== fusion_get_option( 'page_title_bar' ) ) {
			$page_title_bar_contents = Fusion_Helper::fusion_get_page_title_bar_contents( $post_id );

avada_page_title_bar( $page_title_bar_contents[0], $page_title_bar_contents[1], $page_title_bar_contents[2] );
		}
		do_action( 'avada_after_page_title_bar' );
	}
}

if ( ! function_exists( 'avada_is_page_title_bar_active' ) ) {
	/**
	 * Check if page title bar is active.
	 * Note: This checks if the PTB is displayed at all.
	 *
	 * @since 5.8.1
	 * @param int $post_id The post ID.
	 * @return bool
	 */
	function avada_is_page_title_bar_active( $post_id ) {
		return 'hide' !== fusion_get_option( 'page_title_bar' );
	}
}

if ( ! function_exists( 'avada_is_page_title_bar_enabled' ) ) {
	/**
	 * Check if page title bar is enabled.
	 *
	 * @param int $post_id The post ID.
	 * @return bool
	 */
	function avada_is_page_title_bar_enabled( $post_id ) {
		return fusion_get_option( 'page_title_bar_text' ) && 'hide' !== fusion_get_option( 'page_title_bar' );
	}
}

if ( ! function_exists( 'avada_backend_check_new_bbpress_post' ) ) {
	/**
	 * Check if we're creating a new bbPress post.
	 *
	 * @return bool
	 */
	function avada_backend_check_new_bbpress_post() {
		global $pagenow, $post_type;
		return ( 'post-new.php' === $pagenow && in_array( $post_type, [ 'forum', 'topic', 'reply' ], true ) ) ? true : false;
	}
}

if ( ! function_exists( 'avada_display_sidenav' ) ) {
	/**
	 * Displays side navigation.
	 *
	 * @param  int $post_id The post ID.
	 * @return string
	 */
	function avada_display_sidenav( $post_id ) {
		$html = '';

if ( is_page_template( 'side-navigation.php' ) && 0 !== get_queried_object_id() ) {
			$html = '<ul class="side-nav">';

$post_ancestors = get_ancestors( $post_id, 'page' );
			$post_parent    = end( $post_ancestors );

$html .= ( is_page( $post_parent ) ) ? '<li class="current_page_item">' : '<li>';

if ( $post_parent ) {
				$html    .= '<a href="' . get_permalink( $post_parent ) . '" title="' . esc_html__( 'Back to Parent Page', 'Avada' ) . '">' . get_the_title( $post_parent ) . '</a></li>';
				$children = wp_list_pages( 'title_li=&child_of=' . $post_parent . '&echo=0&link_before=<span class="link-text">&link_after=</span>' );
			} else {
				$html    .= '<a href="' . get_permalink( $post_id ) . '" title="' . esc_html__( 'Back to Parent Page', 'Avada' ) . '">' . get_the_title( $post_id ) . '</a></li>';
				$children = wp_list_pages( 'title_li=&child_of=' . $post_id . '&echo=0&link_before=<span class="link-text">&link_after=</span>' );
			}

if ( $children ) {
				$html .= $children;
			}

$html .= '</ul>';
		}

return $html;
	}
}

if ( ! function_exists( 'avada_number_of_featured_images' ) ) {
	/**
	 * Get the number of featured images.
	 * @param bool $count_all Flag to decide if images should be counted even if not displayed.
	 * @return int
	 */
	function avada_number_of_featured_images( $count_all = false ) {
		global $post;
		$number_of_images = 0;

if ( has_post_thumbnail() && ( $count_all || fusion_get_option( 'show_first_featured_image' ) ) ) {
			$number_of_images++;
		}

$posts_slideshow_number = Avada()->settings->get( 'posts_slideshow_number' );
		for ( $i = 2; $i <= $posts_slideshow_number; $i++ ) {
			$attachment_new_id = fusion_get_featured_image_id( 'featured-image-' . $i, $post->post_type );

if ( $attachment_new_id ) {
				$number_of_images++;
			}
		}

return $number_of_images;
	}
}

if ( ! function_exists( 'avada_singular_featured_image' ) ) {
	/**
	 * Featured images for singular pages.
	 *
	 * @since 6.0
	 * @param string|false $context The featured-image context(example: tribe_event, avada_portfolio etc).
	 * @return void
	 */
	function avada_singular_featured_image( $context = '' ) {

if ( '' === $context ) {
			$context = get_post_type();
		}

// ID check is needed for EC.
		if ( 0 === get_the_ID() || false === $context ) {
			return;
		}

Fusion_Dynamic_JS::enqueue_script( 'fusion-flexslider' );

if ( 'tribe_events' !== $context && ( function_exists( 'fusion_is_preview_frame' ) && fusion_is_preview_frame() || fusion_doing_ajax() ) ) {
			echo '<div class="fusion-featured-image-wrapper">';
		}

if ( 'tribe_events' === $context ) {
			if ( function_exists( 'fusion_is_preview_frame' ) && fusion_is_preview_frame() || fusion_doing_ajax() ) {
				add_filter( 'tribe_event_featured_image', 'avada_event_featured_image_wrap', 99, 3 );
			}

// Event featured image, but exclude link.
			echo tribe_event_featured_image( get_the_ID(), 'full', false ); // phpcs:ignore WordPress.Security.EscapeOutput

if ( function_exists( 'fusion_is_preview_frame' ) && fusion_is_preview_frame() || fusion_doing_ajax() ) {
				remove_filter( 'tribe_event_featured_image', 'avada_event_featured_image_wrap', 99 );
			}
		} elseif ( 'avada_portfolio' === $context ) {
			include FUSION_CORE_PATH . '/templates/featured-image-' . $context . '.php';
		} elseif ( 'product' === $context && function_exists( 'woocommerce_show_product_images' ) ) {
			woocommerce_show_product_images();
		} elseif ( 'page' === $context || 'wpfc_sermon' === $context ) {
			get_template_part( 'templates/featured-image-' . $context );
		} else {
			get_template_part( 'templates/featured-image-post' );
		}

if ( 'tribe_events' !== $context && ( function_exists( 'fusion_is_preview_frame' ) && fusion_is_preview_frame() || fusion_doing_ajax() ) ) {
			echo '</div>';
		}

}
}

/**
 * Filter EC featured image markup on single page.
 *
 * @since 6.0
 * @param string $featured_image Generated HTML.
 * @param int    $post_id        Post ID.
 * @param string $size           Image size.
 * @return $string
 */
function avada_event_featured_image_wrap( $featured_image, $post_id, $size ) {
	return '<div class="fusion-featured-image-wrapper">' . $featured_image . '</div>';
}

add_action( 'woocommerce_before_template_part', 'avada_product_before_featured_image_wrap', 99, 4 );
/**
 * Open product featured image wrapper div on single page.
 *
 * @param string $template_name Template name.
 * @param string $template_path Template path. (default: '').
 * @param string $located       Path to be included.
 * @param array  $args          Arguments. (default: array).
 */
function avada_product_before_featured_image_wrap( $template_name, $template_path, $located, $args ) {

if ( 'single-product/product-image.php' === $template_name && ( function_exists( 'fusion_is_preview_frame' ) && fusion_is_preview_frame() ) ) {
		echo '<div class="fusion-featured-image-wrapper">';
	}
}

add_action( 'woocommerce_after_template_part', 'avada_product_after_featured_image_wrap', 99, 4 );
/**
 * Close product featured image wrapper div on single page.
 *
 * @param string $template_name Template name.
 * @param string $template_path Template path. (default: '').
 * @param string $located       Path to be included.
 * @param array  $args          Arguments. (default: array).
 */
function avada_product_after_featured_image_wrap( $template_name, $template_path, $located, $args ) {

if ( 'single-product/product-image.php' === $template_name && ( function_exists( 'fusion_is_preview_frame' ) && fusion_is_preview_frame() ) ) {
		echo '</div>';
	}
}

/* Omit closing PHP tag to avoid "Headers already sent" issues. */

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