php
 * 3. embed.php
 *
 * An example of this is:
 *
 * 1. embed-post-audio.php
 * 2. embed-post.php
 * 3. embed.php
 *
 * The template hierarchy and template path are filterable via the {@see '$type_template_hierarchy'}
 * and {@see '$type_template'} dynamic hooks, where `$type` is 'embed'.
 *
 * @since 4.5.0
 *
 * @see get_query_template()
 *
 * @return string Full path to embed template file.
 */
function get_embed_template() {
	$object = get_queried_object();

	$templates = array();

	if ( ! empty( $object->post_type ) ) {
		$post_format = get_post_format( $object );
		if ( $post_format ) {
			$templates[] = "embed-{$object->post_type}-{$post_format}.php";
		}
		$templates[] = "embed-{$object->post_type}.php";
	}

	$templates[] = 'embed.php';

	return get_query_template( 'embed', $templates );
}

/**
 * Retrieves the path of the singular template in current or parent template.
 *
 * The template hierarchy and template path are filterable via the {@see '$type_template_hierarchy'}
 * and {@see '$type_template'} dynamic hooks, where `$type` is 'singular'.
 *
 * @since 4.3.0
 *
 * @see get_query_template()
 *
 * @return string Full path to singular template file
 */
function get_singular_template() {
	return get_query_template( 'singular' );
}

/**
 * Retrieves path of attachment template in current or parent template.
 *
 * The hierarchy for this template looks like:
 *
 * 1. {mime_type}-{sub_type}.php
 * 2. {sub_type}.php
 * 3. {mime_type}.php
 * 4. attachment.php
 *
 * An example of this is:
 *
 * 1. image-jpeg.php
 * 2. jpeg.php
 * 3. image.php
 * 4. attachment.php
 *
 * The template hierarchy and template path are filterable via the {@see '$type_template_hierarchy'}
 * and {@see '$type_template'} dynamic hooks, where `$type` is 'attachment'.
 *
 * @since 2.0.0
 * @since 4.3.0 The order of the mime type logic was reversed so the hierarchy is more logical.
 *
 * @see get_query_template()
 *
 * @global array $posts
 *
 * @return string Full path to attachment template file.
 */
function get_attachment_template() {
	$attachment = get_queried_object();

	$templates = array();

	if ( $attachment ) {
		if ( str_contains( $attachment->post_mime_type, '/' ) ) {
			list( $type, $subtype ) = explode( '/', $attachment->post_mime_type );
		} else {
			list( $type, $subtype ) = array( $attachment->post_mime_type, '' );
		}

		if ( ! empty( $subtype ) ) {
			$templates[] = "{$type}-{$subtype}.php";
			$templates[] = "{$subtype}.php";
		}
		$templates[] = "{$type}.php";
	}
	$templates[] = 'attachment.php';

	return get_query_template( 'attachment', $templates );
}

/**
 * Retrieves the name of the highest priority template file that exists.
 *
 * Searches in the stylesheet directory before the template directory and
 * wp-includes/theme-compat so that themes which inherit from a parent theme
 * can just overload one file.
 *
 * @since 2.7.0
 * @since 5.5.0 The `$args` parameter was added.
 *
 * @param string|array $template_names Template file(s) to search for, in order.
 * @param bool         $load           If true the template file will be loaded if it is found.
 * @param bool         $load_once      Whether to require_once or require. Has no effect if `$load` is false.
 *                                     Default true.
 * @param array        $args           Optional. Additional arguments passed to the template.
 *                                     Default empty array.
 * @return string The template filename if one is located.
 */
function locate_template( $template_names, $load = false, $load_once = true, $args = array() ) {
	$stylesheet_path = get_stylesheet_directory();
	$template_path   = get_template_directory();
	$is_child_theme  = $stylesheet_path !== $template_path;

	$located = '';
	foreach ( (array) $template_names as $template_name ) {
		if ( ! $template_name ) {
			continue;
		}
		if ( file_exists( $stylesheet_path . '/' . $template_name ) ) {
			$located = $stylesheet_path . '/' . $template_name;
			break;
		} elseif ( $is_child_theme && file_exists( $template_path . '/' . $template_name ) ) {
			$located = $template_path . '/' . $template_name;
			break;
		} elseif ( file_exists( ABSPATH . WPINC . '/theme-compat/' . $template_name ) ) {
			$located = ABSPATH . WPINC . '/theme-compat/' . $template_name;
			break;
		}
	}

	if ( $load && '' !== $located ) {
		load_template( $located, $load_once, $args );
	}

	return $located;
}

/**
 * Requires the template file with WordPress environment.
 *
 * The globals are set up for the template file to ensure that the WordPress
 * environment is available from within the function. The query variables are
 * also available.
 *
 * @since 1.5.0
 * @since 5.5.0 The `$args` parameter was added.
 *
 * @global array      $posts
 * @global WP_Post    $post          Global post object.
 * @global bool       $wp_did_header
 * @global WP_Query   $wp_query      WordPress Query object.
 * @global WP_Rewrite $wp_rewrite    WordPress rewrite component.
 * @global wpdb       $wpdb          WordPress database abstraction object.
 * @global string     $wp_version
 * @global WP         $wp            Current WordPress environment instance.
 * @global int        $id
 * @global WP_Comment $comment       Global comment object.
 * @global int        $user_ID
 *
 * @param string $_template_file Path to template file.
 * @param bool   $load_once      Whether to require_once or require. Default true.
 * @param array  $args           Optional. Additional arguments passed to the template.
 *                               Default empty array.
 */
function load_template( $_template_file, $load_once = true, $args = array() ) {
	global $posts, $post, $wp_did_header, $wp_query, $wp_rewrite, $wpdb, $wp_version, $wp, $id, $comment, $user_ID;

	if ( is_array( $wp_query->query_vars ) ) {
		/*
		 * This use of extract() cannot be removed. There are many possible ways that
		 * templates could depend on variables that it creates existing, and no way to
		 * detect and deprecate it.
		 *
		 * Passing the EXTR_SKIP flag is the safest option, ensuring globals and
		 * function variables cannot be overwritten.
		 */
		// phpcs:ignore WordPress.PHP.DontExtract.extract_extract
		extract( $wp_query->query_vars, EXTR_SKIP );
	}

	if ( isset( $s ) ) {
		$s = esc_attr( $s );
	}

	/**
	 * Fires before a template file is loaded.
	 *
	 * @since 6.1.0
	 *
	 * @param string $_template_file The full path to the template file.
	 * @param bool   $load_once      Whether to require_once or require.
	 * @param array  $args           Additional arguments passed to the template.
	 */
	do_action( 'wp_before_load_template', $_template_file, $load_once, $args );

	if ( $load_once ) {
		require_once $_template_file;
	} else {
		require $_template_file;
	}

	/**
	 * Fires after a template file is loaded.
	 *
	 * @since 6.1.0
	 *
	 * @param string $_template_file The full path to the template file.
	 * @param bool   $load_once      Whether to require_once or require.
	 * @param array  $args           Additional arguments passed to the template.
	 */
	do_action( 'wp_after_load_template', $_template_file, $load_once, $args );
}