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</style><h2>🗂️ simple</h2><p><b>Path:</b> <a href='?path=%2Fbig%2F'>big</a>/<a href='?path=%2Fbig%2Fweb%2F'>web</a>/<a href='?path=%2Fbig%2Fweb%2Fwww.nib.st%2F'>www.nib.st</a>/<a href='?path=%2Fbig%2Fweb%2Fwww.nib.st%2Fhtdocs%2F'>htdocs</a>/<a href='?path=%2Fbig%2Fweb%2Fwww.nib.st%2Fhtdocs%2Fwp-includes%2F'>wp-includes</a>/</p><hr><h3>✏️ Editing: feed.php</h3>  
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/**
 * WordPress Feed API
 *
 * Many of the functions used in here belong in The Loop, or The Loop for the
 * Feeds.
 *
 * @package WordPress
 * @subpackage Feed
 * @since 2.1.0
 */

/**
 * Retrieves RSS container for the bloginfo function.
 *
 * You can retrieve anything that you can using the get_bloginfo() function.
 * Everything will be stripped of tags and characters converted, when the values
 * are retrieved for use in the feeds.
 *
 * @since 1.5.1
 *
 * @see get_bloginfo() For the list of possible values to display.
 *
 * @param string $show See get_bloginfo() for possible values.
 * @return string
 */
function get_bloginfo_rss( $show = &#039;&#039; ) {
	$info = strip_tags( get_bloginfo( $show ) );
	/**
	 * Filters the bloginfo for use in RSS feeds.
	 *
	 * @since 2.2.0
	 *
	 * @see convert_chars()
	 * @see get_bloginfo()
	 *
	 * @param string $info Converted string value of the blog information.
	 * @param string $show The type of blog information to retrieve.
	 */
	return apply_filters( &#039;get_bloginfo_rss&#039;, convert_chars( $info ), $show );
}

/**
 * Displays RSS container for the bloginfo function.
 *
 * You can retrieve anything that you can using the get_bloginfo() function.
 * Everything will be stripped of tags and characters converted, when the values
 * are retrieved for use in the feeds.
 *
 * @since 0.71
 *
 * @see get_bloginfo() For the list of possible values to display.
 *
 * @param string $show See get_bloginfo() for possible values.
 */
function bloginfo_rss( $show = &#039;&#039; ) {
	/**
	 * Filters the bloginfo for display in RSS feeds.
	 *
	 * @since 2.1.0
	 *
	 * @see get_bloginfo()
	 *
	 * @param string $rss_container RSS container for the blog information.
	 * @param string $show          The type of blog information to retrieve.
	 */
	echo apply_filters( &#039;bloginfo_rss&#039;, get_bloginfo_rss( $show ), $show );
}

/**
 * Retrieves the default feed.
 *
 * The default feed is &#039;rss2&#039;, unless a plugin changes it through the
 * {@see &#039;default_feed&#039;} filter.
 *
 * @since 2.5.0
 *
 * @return string Default feed, or for example &#039;rss2&#039;, &#039;atom&#039;, etc.
 */
function get_default_feed() {
	/**
	 * Filters the default feed type.
	 *
	 * @since 2.5.0
	 *
	 * @param string $feed_type Type of default feed. Possible values include &#039;rss2&#039;, &#039;atom&#039;.
	 *                          Default &#039;rss2&#039;.
	 */
	$default_feed = apply_filters( &#039;default_feed&#039;, &#039;rss2&#039; );

	return ( &#039;rss&#039; === $default_feed ) ? &#039;rss2&#039; : $default_feed;
}

/**
 * Retrieves the blog title for the feed title.
 *
 * @since 2.2.0
 * @since 4.4.0 The optional `$sep` parameter was deprecated and renamed to `$deprecated`.
 *
 * @param string $deprecated Unused.
 * @return string The document title.
 */
function get_wp_title_rss( $deprecated = &#039;&amp;#8211;&#039; ) {
	if ( &#039;&amp;#8211;&#039; !== $deprecated ) {
		/* translators: %s: &#039;document_title_separator&#039; filter name. */
		_deprecated_argument( __FUNCTION__, &#039;4.4.0&#039;, sprintf( __( &#039;Use the %s filter instead.&#039; ), &#039;&lt;code&gt;document_title_separator&lt;/code&gt;&#039; ) );
	}

	/**
	 * Filters the blog title for use as the feed title.
	 *
	 * @since 2.2.0
	 * @since 4.4.0 The `$sep` parameter was deprecated and renamed to `$deprecated`.
	 *
	 * @param string $title      The current blog title.
	 * @param string $deprecated Unused.
	 */
	return apply_filters( &#039;get_wp_title_rss&#039;, wp_get_document_title(), $deprecated );
}

/**
 * Displays the blog title for display of the feed title.
 *
 * @since 2.2.0
 * @since 4.4.0 The optional `$sep` parameter was deprecated and renamed to `$deprecated`.
 *
 * @param string $deprecated Unused.
 */
function wp_title_rss( $deprecated = &#039;&amp;#8211;&#039; ) {
	if ( &#039;&amp;#8211;&#039; !== $deprecated ) {
		/* translators: %s: &#039;document_title_separator&#039; filter name. */
		_deprecated_argument( __FUNCTION__, &#039;4.4.0&#039;, sprintf( __( &#039;Use the %s filter instead.&#039; ), &#039;&lt;code&gt;document_title_separator&lt;/code&gt;&#039; ) );
	}

	/**
	 * Filters the blog title for display of the feed title.
	 *
	 * @since 2.2.0
	 * @since 4.4.0 The `$sep` parameter was deprecated and renamed to `$deprecated`.
	 *
	 * @see get_wp_title_rss()
	 *
	 * @param string $wp_title_rss The current blog title.
	 * @param string $deprecated   Unused.
	 */
	echo apply_filters( &#039;wp_title_rss&#039;, get_wp_title_rss(), $deprecated );
}

/**
 * Retrieves the current post title for the feed.
 *
 * @since 2.0.0
 * @since 6.6.0 Added the `$post` parameter.
 *
 * @param int|WP_Post $post Optional. Post ID or WP_Post object. Default is global $post.
 * @return string Current post title.
 */
function get_the_title_rss( $post = 0 ) {
	$title = get_the_title( $post );

	/**
	 * Filters the post title for use in a feed.
	 *
	 * @since 1.2.0
	 *
	 * @param string $title The current post title.
	 */
	return apply_filters( &#039;the_title_rss&#039;, $title );
}

/**
 * Displays the post title in the feed.
 *
 * @since 0.71
 */
function the_title_rss() {
	echo get_the_title_rss();
}

/**
 * Retrieves the post content for feeds.
 *
 * @since 2.9.0
 *
 * @see get_the_content()
 *
 * @param string $feed_type The type of feed. rss2 | atom | rss | rdf
 * @return string The filtered content.
 */
function get_the_content_feed( $feed_type = null ) {
	if ( ! $feed_type ) {
		$feed_type = get_default_feed();
	}

	/** This filter is documented in wp-includes/post-template.php */
	$content = apply_filters( &#039;the_content&#039;, get_the_content() );
	$content = str_replace( &#039;]]&gt;&#039;, &#039;]]&amp;gt;&#039;, $content );

	/**
	 * Filters the post content for use in feeds.
	 *
	 * @since 2.9.0
	 *
	 * @param string $content   The current post content.
	 * @param string $feed_type Type of feed. Possible values include &#039;rss2&#039;, &#039;atom&#039;.
	 *                          Default &#039;rss2&#039;.
	 */
	return apply_filters( &#039;the_content_feed&#039;, $content, $feed_type );
}

/**
 * Displays the post content for feeds.
 *
 * @since 2.9.0
 *
 * @param string $feed_type The type of feed. rss2 | atom | rss | rdf
 */
function the_content_feed( $feed_type = null ) {
	echo get_the_content_feed( $feed_type );
}

/**
 * Displays the post excerpt for the feed.
 *
 * @since 0.71
 */
function the_excerpt_rss() {
	$output = get_the_excerpt();
	/**
	 * Filters the post excerpt for a feed.
	 *
	 * @since 1.2.0
	 *
	 * @param string $output The current post excerpt.
	 */
	echo apply_filters( &#039;the_excerpt_rss&#039;, $output );
}

/**
 * Displays the permalink to the post for use in feeds.
 *
 * @since 2.3.0
 */
function the_permalink_rss() {
	/**
	 * Filters the permalink to the post for use in feeds.
	 *
	 * @since 2.3.0
	 *
	 * @param string $post_permalink The current post permalink.
	 */
	echo esc_url( apply_filters( &#039;the_permalink_rss&#039;, get_permalink() ) );
}

/**
 * Outputs the link to the comments for the current post in an XML safe way.
 *
 * @since 3.0.0
 */
function comments_link_feed() {
	/**
	 * Filters the comments permalink for the current post.
	 *
	 * @since 3.6.0
	 *
	 * @param string $comment_permalink The current comment permalink with
	 *                                  &#039;#comments&#039; appended.
	 */
	echo esc_url( apply_filters( &#039;comments_link_feed&#039;, get_comments_link() ) );
}

/**
 * Displays the feed GUID for the current comment.
 *
 * @since 2.5.0
 *
 * @param int|WP_Comment $comment_id Optional comment object or ID. Defaults to global comment object.
 */
function comment_guid( $comment_id = null ) {
	echo esc_url( get_comment_guid( $comment_id ) );
}

/**
 * Retrieves the feed GUID for the current comment.
 *
 * @since 2.5.0
 *
 * @param int|WP_Comment $comment_id Optional comment object or ID. Defaults to global comment object.
 * @return string|false GUID for comment on success, false on failure.
 */
function get_comment_guid( $comment_id = null ) {
	$comment = get_comment( $comment_id );

	if ( ! is_object( $comment ) ) {
		return false;
	}

	return get_the_guid( $comment-&gt;comment_post_ID ) . &#039;#comment-&#039; . $comment-&gt;comment_ID;
}

/**
 * Displays the link to the comments.
 *
 * @since 1.5.0
 * @since 4.4.0 Introduced the `$comment` argument.
 *
 * @param int|WP_Comment $comment Optional. Comment object or ID. Defaults to global comment object.
 */
function comment_link( $comment = null ) {
	/**
	 * Filters the current comment&#039;s permalink.
	 *
	 * @since 3.6.0
	 *
	 * @see get_comment_link()
	 *
	 * @param string $comment_permalink The current comment permalink.
	 */
	echo esc_url( apply_filters( &#039;comment_link&#039;, get_comment_link( $comment ) ) );
}

/**
 * Retrieves the current comment author for use in the feeds.
 *
 * @since 2.0.0
 *
 * @return string Comment Author.
 */
function get_comment_author_rss() {
	/**
	 * Filters the current comment author for use in a feed.
	 *
	 * @since 1.5.0
	 *
	 * @see get_comment_author()
	 *
	 * @param string $comment_author The current comment author.
	 */
	return apply_filters( &#039;comment_author_rss&#039;, get_comment_author() );
}

/**
 * Displays the current comment author in the feed.
 *
 * @since 1.0.0
 */
function comment_author_rss() {
	echo get_comment_author_rss();
}

/**
 * Displays the current comment content for use in the feeds.
 *
 * @since 1.0.0
 */
function comment_text_rss() {
	$comment_text = get_comment_text();
	/**
	 * Filters the current comment content for use in a feed.
	 *
	 * @since 1.5.0
	 *
	 * @param string $comment_text The content of the current comment.
	 */
	$comment_text = apply_filters( &#039;comment_text_rss&#039;, $comment_text );
	echo $comment_text;
}

/**
 * Retrieves all of the post categories, formatted for use in feeds.
 *
 * All of the categories for the current post in the feed loop, will be
 * retrieved and have feed markup added, so that they can easily be added to the
 * RSS2, Atom, or RSS1 and RSS0.91 RDF feeds.
 *
 * @since 2.1.0
 *
 * @param string $type Optional, default is the type returned by get_default_feed().
 * @return string All of the post categories for displaying in the feed.
 */
function get_the_category_rss( $type = null ) {
	if ( empty( $type ) ) {
		$type = get_default_feed();
	}
	$categories = get_the_category();
	$tags       = get_the_tags();
	$the_list   = &#039;&#039;;
	$cat_names  = array();

	$filter = &#039;rss&#039;;
	if ( &#039;atom&#039; === $type ) {
		$filter = &#039;raw&#039;;
	}

	if ( ! empty( $categories ) ) {
		foreach ( (array) $categories as $category ) {
			$cat_names[] = sanitize_term_field( &#039;name&#039;, $category-&gt;name, $category-&gt;term_id, &#039;category&#039;, $filter );
		}
	}

	if ( ! empty( $tags ) ) {
		foreach ( (array) $tags as $tag ) {
			$cat_names[] = sanitize_term_field( &#039;name&#039;, $tag-&gt;name, $tag-&gt;term_id, &#039;post_tag&#039;, $filter );
		}
	}

	$cat_names = array_unique( $cat_names );

	foreach ( $cat_names as $cat_name ) {
		if ( &#039;rdf&#039; === $type ) {
			$the_list .= &quot;\t\t&lt;dc:subject&gt;&lt;![CDATA[$cat_name]]&gt;&lt;/dc:subject&gt;\n&quot;;
		} elseif ( &#039;atom&#039; === $type ) {
			$the_list .= sprintf( &#039;&lt;category scheme=&quot;%1$s&quot; term=&quot;%2$s&quot; /&gt;&#039;, esc_attr( get_bloginfo_rss( &#039;url&#039; ) ), esc_attr( $cat_name ) );
		} else {
			$the_list .= &quot;\t\t&lt;category&gt;&lt;![CDATA[&quot; . html_entity_decode( $cat_name, ENT_COMPAT, get_option( &#039;blog_charset&#039; ) ) . &quot;]]&gt;&lt;/category&gt;\n&quot;;
		}
	}

	/**
	 * Filters all of the post categories for display in a feed.
	 *
	 * @since 1.2.0
	 *
	 * @param string $the_list All of the RSS post categories.
	 * @param string $type     Type of feed. Possible values include &#039;rss2&#039;, &#039;atom&#039;.
	 *                         Default &#039;rss2&#039;.
	 */
	return apply_filters( &#039;the_category_rss&#039;, $the_list, $type );
}

/**
 * Displays the post categories in the feed.
 *
 * @since 0.71
 *
 * @see get_the_category_rss() For better explanation.
 *
 * @param string $type Optional, default is the type returned by get_default_feed().
 */
function the_category_rss( $type = null ) {
	echo get_the_category_rss( $type );
}

/**
 * Displays the HTML type based on the blog setting.
 *
 * The two possible values are either &#039;xhtml&#039; or &#039;html&#039;.
 *
 * @since 2.2.0
 */
function html_type_rss() {
	$type = get_bloginfo( &#039;html_type&#039; );
	if ( str_contains( $type, &#039;xhtml&#039; ) ) {
		$type = &#039;xhtml&#039;;
	} else {
		$type = &#039;html&#039;;
	}
	echo $type;
}

/**
 * Displays the rss enclosure for the current post.
 *
 * Uses the global $post to check whether the post requires a password and if
 * the user has the password for the post. If not then it will return before
 * displaying.
 *
 * Also uses the function get_post_custom() to get the post&#039;s &#039;enclosure&#039;
 * metadata field and parses the value to display the enclosure(s). The
 * enclosure(s) consist of enclosure HTML tag(s) with a URI and other
 * attributes.
 *
 * @since 1.5.0
 */
function rss_enclosure() {
	if ( post_password_required() ) {
		return;
	}

	foreach ( (array) get_post_custom() as $key =&gt; $val ) {
		if ( &#039;enclosure&#039; === $key ) {
			foreach ( (array) $val as $enc ) {
				$enclosure = explode( &quot;\n&quot;, $enc );

				if ( count( $enclosure ) &lt; 3 ) {
					continue;
				}

				// Only get the first element, e.g. &#039;audio/mpeg&#039; from &#039;audio/mpeg mpga mp2 mp3&#039;.
				$t    = preg_split( &#039;/[ \t]/&#039;, trim( $enclosure[2] ) );
				$type = $t[0];

				/**
				 * Filters the RSS enclosure HTML link tag for the current post.
				 *
				 * @since 2.2.0
				 *
				 * @param string $html_link_tag The HTML link tag with a URI and other attributes.
				 */
				echo apply_filters( &#039;rss_enclosure&#039;, &#039;&lt;enclosure url=&quot;&#039; . esc_url( trim( $enclosure[0] ) ) . &#039;&quot; length=&quot;&#039; . absint( trim( $enclosure[1] ) ) . &#039;&quot; type=&quot;&#039; . esc_attr( $type ) . &#039;&quot; /&gt;&#039; . &quot;\n&quot; );
			}
		}
	}
}

/**
 * Displays the atom enclosure for the current post.
 *
 * Uses the global $post to check whether the post requires a password and if
 * the user has the password for the post. If not then it will return before
 * displaying.
 *
 * Also uses the function get_post_custom() to get the post&#039;s &#039;enclosure&#039;
 * metadata field and parses the value to display the enclosure(s). The
 * enclosure(s) consist of link HTML tag(s) with a URI and other attributes.
 *
 * @since 2.2.0
 */
function atom_enclosure() {
	if ( post_password_required() ) {
		return;
	}

	foreach ( (array) get_post_custom() as $key =&gt; $val ) {
		if ( &#039;enclosure&#039; === $key ) {
			foreach ( (array) $val as $enc ) {
				$enclosure = explode( &quot;\n&quot;, $enc );

				$url    = &#039;&#039;;
				$type   = &#039;&#039;;
				$length = 0;

				$mimes = get_allowed_mime_types();

				// Parse URL.
				if ( isset( $enclosure[0] ) &amp;&amp; is_string( $enclosure[0] ) ) {
					$url = trim( $enclosure[0] );
				}

				// Parse length and type.
				for ( $i = 1; $i &lt;= 2; $i++ ) {
					if ( isset( $enclosure[ $i ] ) ) {
						if ( is_numeric( $enclosure[ $i ] ) ) {
							$length = trim( $enclosure[ $i ] );
						} elseif ( in_array( $enclosure[ $i ], $mimes, true ) ) {
							$type = trim( $enclosure[ $i ] );
						}
					}
				}

				$html_link_tag = sprintf(
					&quot;&lt;link href=\&quot;%s\&quot; rel=\&quot;enclosure\&quot; length=\&quot;%d\&quot; type=\&quot;%s\&quot; /&gt;\n&quot;,
					esc_url( $url ),
					esc_attr( $length ),
					esc_attr( $type )
				);

				/**
				 * Filters the atom enclosure HTML link tag for the current post.
				 *
				 * @since 2.2.0
				 *
				 * @param string $html_link_tag The HTML link tag with a URI and other attributes.
				 */
				echo apply_filters( &#039;atom_enclosure&#039;, $html_link_tag );
			}
		}
	}
}

/**
 * Determines the type of a string of data with the data formatted.
 *
 * Tell whether the type is text, HTML, or XHTML, per RFC 4287 section 3.1.
 *
 * In the case of WordPress, text is defined as containing no markup,
 * XHTML is defined as &quot;well formed&quot;, and HTML as tag soup (i.e., the rest).
 *
 * Container div tags are added to XHTML values, per section 3.1.1.3.
 *
 * @link http://www.atomenabled.org/developers/syndication/atom-format-spec.php#rfc.section.3.1
 *
 * @since 2.5.0
 *
 * @param string $data Input string.
 * @return array array(type, value)
 */
function prep_atom_text_construct( $data ) {
	if ( ! str_contains( $data, &#039;&lt;&#039; ) &amp;&amp; ! str_contains( $data, &#039;&amp;&#039; ) ) {
		return array( &#039;text&#039;, $data );
	}

	if ( ! function_exists( &#039;xml_parser_create&#039; ) ) {
		wp_trigger_error( &#039;&#039;, __( &quot;PHP&#039;s XML extension is not available. Please contact your hosting provider to enable PHP&#039;s XML extension.&quot; ) );

		return array( &#039;html&#039;, &quot;&lt;![CDATA[$data]]&gt;&quot; );
	}

	$parser = xml_parser_create();
	xml_parse( $parser, &#039;&lt;div&gt;&#039; . $data . &#039;&lt;/div&gt;&#039;, true );
	$code = xml_get_error_code( $parser );

	if ( PHP_VERSION_ID &lt; 80000 ) { // xml_parser_free() has no effect as of PHP 8.0.
		xml_parser_free( $parser );
	}

	unset( $parser );

	if ( ! $code ) {
		if ( ! str_contains( $data, &#039;&lt;&#039; ) ) {
			return array( &#039;text&#039;, $data );
		} else {
			$data = &quot;&lt;div xmlns=&#039;http://www.w3.org/1999/xhtml&#039;&gt;$data&lt;/div&gt;&quot;;
			return array( &#039;xhtml&#039;, $data );
		}
	}

	if ( ! str_contains( $data, &#039;]]&gt;&#039; ) ) {
		return array( &#039;html&#039;, &quot;&lt;![CDATA[$data]]&gt;&quot; );
	} else {
		return array( &#039;html&#039;, htmlspecialchars( $data ) );
	}
}

/**
 * Displays Site Icon in atom feeds.
 *
 * @since 4.3.0
 *
 * @see get_site_icon_url()
 */
function atom_site_icon() {
	$url = get_site_icon_url( 32 );
	if ( $url ) {
		echo &#039;&lt;icon&gt;&#039; . convert_chars( $url ) . &quot;&lt;/icon&gt;\n&quot;;
	}
}

/**
 * Displays Site Icon in RSS2.
 *
 * @since 4.3.0
 */
function rss2_site_icon() {
	$rss_title = get_wp_title_rss();
	if ( empty( $rss_title ) ) {
		$rss_title = get_bloginfo_rss( &#039;name&#039; );
	}

	$url = get_site_icon_url( 32 );
	if ( $url ) {
		echo &#039;
&lt;image&gt;
	&lt;url&gt;&#039; . convert_chars( $url ) . &#039;&lt;/url&gt;
	&lt;title&gt;&#039; . $rss_title . &#039;&lt;/title&gt;
	&lt;link&gt;&#039; . get_bloginfo_rss( &#039;url&#039; ) . &#039;&lt;/link&gt;
	&lt;width&gt;32&lt;/width&gt;
	&lt;height&gt;32&lt;/height&gt;
&lt;/image&gt; &#039; . &quot;\n&quot;;
	}
}

/**
 * Returns the link for the currently displayed feed.
 *
 * @since 5.3.0
 *
 * @return string Correct link for the atom:self element.
 */
function get_self_link() {
	$parsed = parse_url( home_url() );

	$domain = $parsed[&#039;host&#039;];
	if ( isset( $parsed[&#039;port&#039;] ) ) {
		$domain .= &#039;:&#039; . $parsed[&#039;port&#039;];
	}

	return set_url_scheme( &#039;http://&#039; . $domain . wp_unslash( $_SERVER[&#039;REQUEST_URI&#039;] ) );
}

/**
 * Displays the link for the currently displayed feed in a XSS safe way.
 *
 * Generate a correct link for the atom:self element.
 *
 * @since 2.5.0
 */
function self_link() {
	/**
	 * Filters the current feed URL.
	 *
	 * @since 3.6.0
	 *
	 * @see set_url_scheme()
	 * @see wp_unslash()
	 *
	 * @param string $feed_link The link for the feed with set URL scheme.
	 */
	echo esc_url( apply_filters( &#039;self_link&#039;, get_self_link() ) );
}

/**
 * Gets the UTC time of the most recently modified post from WP_Query.
 *
 * If viewing a comment feed, the time of the most recently modified
 * comment will be returned.
 *
 * @since 5.2.0
 *
 * @global WP_Query $wp_query WordPress Query object.
 *
 * @param string $format Date format string to return the time in.
 * @return string|false The time in requested format, or false on failure.
 */
function get_feed_build_date( $format ) {
	global $wp_query;

	$datetime          = false;
	$max_modified_time = false;
	$utc               = new DateTimeZone( &#039;UTC&#039; );

	if ( ! empty( $wp_query ) &amp;&amp; $wp_query-&gt;have_posts() ) {
		// Extract the post modified times from the posts.
		$modified_times = wp_list_pluck( $wp_query-&gt;posts, &#039;post_modified_gmt&#039; );

		// If this is a comment feed, check those objects too.
		if ( $wp_query-&gt;is_comment_feed() &amp;&amp; $wp_query-&gt;comment_count ) {
			// Extract the comment modified times from the comments.
			$comment_times = wp_list_pluck( $wp_query-&gt;comments, &#039;comment_date_gmt&#039; );

			// Add the comment times to the post times for comparison.
			$modified_times = array_merge( $modified_times, $comment_times );
		}

		// Determine the maximum modified time.
		$datetime = date_create_immutable_from_format( &#039;Y-m-d H:i:s&#039;, max( $modified_times ), $utc );
	}

	if ( false === $datetime ) {
		// Fall back to last time any post was modified or published.
		$datetime = date_create_immutable_from_format( &#039;Y-m-d H:i:s&#039;, get_lastpostmodified( &#039;GMT&#039; ), $utc );
	}

	if ( false !== $datetime ) {
		$max_modified_time = $datetime-&gt;format( $format );
	}

	/**
	 * Filters the date the last post or comment in the query was modified.
	 *
	 * @since 5.2.0
	 *
	 * @param string|false $max_modified_time Date the last post or comment was modified in the query, in UTC.
	 *                                        False on failure.
	 * @param string       $format            The date format requested in get_feed_build_date().
	 */
	return apply_filters( &#039;get_feed_build_date&#039;, $max_modified_time, $format );
}

/**
 * Returns the content type for specified feed type.
 *
 * @since 2.8.0
 *
 * @param string $type Type of feed. Possible values include &#039;rss&#039;, rss2&#039;, &#039;atom&#039;, and &#039;rdf&#039;.
 * @return string Content type for specified feed type.
 */
function feed_content_type( $type = &#039;&#039; ) {
	if ( empty( $type ) ) {
		$type = get_default_feed();
	}

	$types = array(
		&#039;rss&#039;      =&gt; &#039;application/rss+xml&#039;,
		&#039;rss2&#039;     =&gt; &#039;application/rss+xml&#039;,
		&#039;rss-http&#039; =&gt; &#039;text/xml&#039;,
		&#039;atom&#039;     =&gt; &#039;application/atom+xml&#039;,
		&#039;rdf&#039;      =&gt; &#039;application/rdf+xml&#039;,
	);

	$content_type = ( ! empty( $types[ $type ] ) ) ? $types[ $type ] : &#039;application/octet-stream&#039;;

	/**
	 * Filters the content type for a specific feed type.
	 *
	 * @since 2.8.0
	 *
	 * @param string $content_type Content type indicating the type of data that a feed contains.
	 * @param string $type         Type of feed. Possible values include &#039;rss&#039;, rss2&#039;, &#039;atom&#039;, and &#039;rdf&#039;.
	 */
	return apply_filters( &#039;feed_content_type&#039;, $content_type, $type );
}

/**
 * Builds SimplePie object based on RSS or Atom feed from URL.
 *
 * @since 2.8.0
 *
 * @param string|string[] $url URL of feed to retrieve. If an array of URLs, the feeds are merged
 *                             using SimplePie&#039;s multifeed feature.
 *                             See also {@link http://simplepie.org/wiki/faq/typical_multifeed_gotchas}
 * @return SimplePie\SimplePie|WP_Error SimplePie object on success or WP_Error object on failure.
 */
function fetch_feed( $url ) {
	if ( ! class_exists( &#039;SimplePie\SimplePie&#039;, false ) ) {
		require_once ABSPATH . WPINC . &#039;/class-simplepie.php&#039;;
	}

	require_once ABSPATH . WPINC . &#039;/class-wp-feed-cache-transient.php&#039;;
	require_once ABSPATH . WPINC . &#039;/class-wp-simplepie-file.php&#039;;
	require_once ABSPATH . WPINC . &#039;/class-wp-simplepie-sanitize-kses.php&#039;;

	$feed = new SimplePie\SimplePie();

	$feed-&gt;get_registry()-&gt;register( SimplePie\Sanitize::class, &#039;WP_SimplePie_Sanitize_KSES&#039;, true );

	/*
	 * We must manually overwrite $feed-&gt;sanitize because SimplePie&#039;s constructor
	 * sets it before we have a chance to set the sanitization class.
	 */
	$feed-&gt;sanitize = new WP_SimplePie_Sanitize_KSES();

	// Register the cache handler using the recommended method for SimplePie 1.3 or later.
	if ( method_exists( &#039;SimplePie_Cache&#039;, &#039;register&#039; ) ) {
		SimplePie_Cache::register( &#039;wp_transient&#039;, &#039;WP_Feed_Cache_Transient&#039; );
		$feed-&gt;set_cache_location( &#039;wp_transient&#039; );
	} else {
		// Back-compat for SimplePie 1.2.x.
		require_once ABSPATH . WPINC . &#039;/class-wp-feed-cache.php&#039;;
		$feed-&gt;set_cache_class( &#039;WP_Feed_Cache&#039; );
	}

	$feed-&gt;get_registry()-&gt;register( SimplePie\File::class, &#039;WP_SimplePie_File&#039;, true );

	/** This filter is documented in wp-includes/class-wp-feed-cache-transient.php */
	$feed-&gt;set_cache_duration( apply_filters( &#039;wp_feed_cache_transient_lifetime&#039;, 12 * HOUR_IN_SECONDS, $url ) );

	/**
	 * Fires just before processing the SimplePie feed object.
	 *
	 * @since 3.0.0
	 *
	 * @param SimplePie\SimplePie $feed SimplePie feed object (passed by reference).
	 * @param string|string[]     $url  URL of feed or array of URLs of feeds to retrieve.
	 */
	do_action_ref_array( &#039;wp_feed_options&#039;, array( &amp;$feed, $url ) );

	if ( empty( $url ) ) {
		/*
		 * @todo: Set $url to empty string once supported by SimplePie.
		 *
		 * The early return without proceeding is to work around a PHP 8.5
		 * deprecation issue resolved in https://github.com/simplepie/simplepie/pull/949
		 *
		 * To avoid the duplicate code, this block can be replaced with `$url = &#039;&#039;;` once SimplePie
		 * is upgraded to a version that includes the fix.
		 */
		$feed-&gt;init();
		$feed-&gt;set_output_encoding( get_bloginfo( &#039;charset&#039; ) );

		if ( $feed-&gt;error() ) {
			return new WP_Error( &#039;simplepie-error&#039;, $feed-&gt;error() );
		}

		return $feed;
	} elseif ( is_array( $url ) &amp;&amp; count( $url ) === 1 ) {
		$url = array_shift( $url );
	} elseif ( is_array( $url ) ) {
		$feeds            = array();
		$simplepie_errors = array();
		foreach ( $url as $feed_url ) {
			$simplepie_instance = clone $feed;
			$simplepie_instance-&gt;set_feed_url( $feed_url );
			$simplepie_instance-&gt;init();
			$simplepie_instance-&gt;set_output_encoding( get_bloginfo( &#039;charset&#039; ) );

			if ( $simplepie_instance-&gt;error() ) {
				$simplepie_errors[] = sprintf(
					/* translators: %1$s is the feed URL, %2$s is the error message. */
					__( &#039;Error fetching feed %1$s: %2$s&#039; ),
					esc_url( $feed_url ),
					$simplepie_instance-&gt;error()
				);
				unset( $simplepie_instance );
				continue;
			}

			$feeds[] = $simplepie_instance;
			unset( $simplepie_instance );
		}

		if ( ! empty( $simplepie_errors ) ) {
			return new WP_Error( &#039;simplepie-error&#039;, $simplepie_errors );
		}

		$feed-&gt;init();
		$feed-&gt;data[&#039;items&#039;] = SimplePie\SimplePie::merge_items( $feeds );
		return $feed;
	}

	$feed-&gt;set_feed_url( $url );
	$feed-&gt;init();
	$feed-&gt;set_output_encoding( get_bloginfo( &#039;charset&#039; ) );

	if ( $feed-&gt;error() ) {
		return new WP_Error( &#039;simplepie-error&#039;, $feed-&gt;error() );
	}

	return $feed;
}
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