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wp-content/plugins/jetpack/modules/sitemaps/sitemap-buffer-image-xmlwriter.php

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+<?php // phpcs:ignore WordPress.Files.FileName.InvalidClassFileName
+/**
+ * XMLWriter implementation of the image sitemap buffer.
+ *
+ * @since 14.6
+ * @package automattic/jetpack
+ */
+
+if ( ! defined( 'ABSPATH' ) ) {
+	exit( 0 );
+}
+
+/**
+ * A buffer for constructing sitemap image xml files using XMLWriter.
+ *
+ * @since 14.6
+ */
+class Jetpack_Sitemap_Buffer_Image_XMLWriter extends Jetpack_Sitemap_Buffer_XMLWriter {
+	/**
+	 * Initialize the buffer with required headers (no root element here).
+	 */
+	protected function initialize_buffer() {
+		// Add generator comment
+		$this->writer->writeComment( "generator='jetpack-" . JETPACK__VERSION . "'" );
+		$this->writer->writeComment( 'Jetpack_Sitemap_Buffer_Image_XMLWriter' );
+
+		// Add stylesheet
+		$this->writer->writePi(
+			'xml-stylesheet',
+			'type="text/xsl" href="' . $this->finder->construct_sitemap_url( 'image-sitemap.xsl' ) . '"'
+		);
+	}
+
+	/**
+	 * Start the root element and write its namespaces.
+	 */
+	protected function start_root() {
+		$this->writer->startElement( 'urlset' );
+
+		/**
+		 * Filter the XML namespaces included in image sitemaps.
+		 *
+		 * @module sitemaps
+		 *
+		 * @since 4.8.0
+		 *
+		 * @param array $namespaces Associative array with namespaces and namespace URIs.
+		 */
+		$namespaces = apply_filters(
+			'jetpack_sitemap_image_ns',
+			array(
+				'xmlns:xsi'          => 'http://www.w3.org/2001/XMLSchema-instance',
+				'xsi:schemaLocation' => 'http://www.sitemaps.org/schemas/sitemap/0.9 http://www.sitemaps.org/schemas/sitemap/0.9/sitemap.xsd',
+				'xmlns'              => 'http://www.sitemaps.org/schemas/sitemap/0.9',
+				'xmlns:image'        => 'http://www.google.com/schemas/sitemap-image/1.1',
+			)
+		);
+
+		foreach ( $namespaces as $name => $value ) {
+			$this->writer->writeAttribute( $name, $value );
+		}
+	}
+
+	/**
+	 * Append a URL entry with image information to the sitemap.
+	 *
+	 * @param array $array The URL item to append.
+	 */
+	protected function append_item( $array ) {
+		if ( ! isset( $array['url'] ) || ! is_array( $array['url'] ) ) {
+			return;
+		}
+
+		if ( isset( $array['url']['image:image'] ) ) {
+			if ( empty( $array['url']['image:image']['image:title'] ) ) {
+				unset( $array['url']['image:image']['image:title'] );
+			}
+			if ( empty( $array['url']['image:image']['image:caption'] ) ) {
+				unset( $array['url']['image:image']['image:caption'] );
+			}
+		}
+
+		$this->array_to_xml( $array );
+	}
+}