wpr-sitemap-generator.php

wpr-sitemap-generator.php

// Create a custom sitemap with the lastest n posts, and updates it after saving a post. 
// Useful for big sites. 
// Writes an xml file in the root level of the wp install: https://example/my-custom-sitemap.xml

add_action( "save_post", "wpr_create_custom_sitemap" );
function wpr_create_custom_sitemap() {
	if ( str_replace( '-', '', get_option( 'gmt_offset' ) ) < 0 ) { 
		$tempo = '-0' . str_replace( '-', '', get_option( 'gmt_offset' ) ); 
	} else { 
		$tempo = get_option( 'gmt_offset' ); 
	}
	if( strlen( $tempo ) == 3 ) { $tempo = $tempo . ':00'; }
	$postsForSitemap = get_posts( array(
		'numberposts' => 2, // this is the number of pages, change it accordingly
		'orderby'     => 'modified',
		'post_type'   => array( 'post', 'page' ),
		'order'       => 'DESC'
	) );
	$sitemap .= '<?xml version="1.0" encoding="UTF-8"?>' . '<?xml-stylesheet type="text/xsl" href="' . 
		esc_url( home_url( '/' ) ) . 'sitemap.xsl"?>';
	$sitemap .= "\n" . '<urlset 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">' . "\n";
	$sitemap .= "\t" . '<url>' . "\n" .
		"\t\t" . '<loc>' . esc_url( home_url( '/' ) ) . '</loc>' .
		"\n\t\t" . '<lastmod>' . date( "Y-m-d\TH:i:s", current_time( 'timestamp', 0 ) ) . $tempo . '</lastmod>' .
		"\n\t\t" . '<changefreq>daily</changefreq>' .
		"\n\t\t" . '<priority>1.0</priority>' .
		"\n\t" . '</url>' . "\n";
	foreach( $postsForSitemap as $post ) {
		setup_postdata( $post);
		$postdate = explode( " ", $post->post_modified );
		$sitemap .= "\t" . '<url>' . "\n" .
			"\t\t" . '<loc>' . get_permalink( $post->ID ) . '</loc>' .
			"\n\t\t" . '<lastmod>' . $postdate[0] . 'T' . $postdate[1] . $tempo . '</lastmod>' .
			"\n\t\t" . '<changefreq>Weekly</changefreq>' .
			"\n\t\t" . '<priority>0.5</priority>' .
			"\n\t" . '</url>' . "\n";
	}
	$sitemap .= '</urlset>';
	$fp = fopen( ABSPATH . "my-custom-sitemap.xml", 'w' );
	fwrite( $fp, $sitemap );
	fclose( $fp );
}