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@them-es them-es/functions.php
Last active Nov 30, 2019

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WordPress Multiblog: Combine WP-API feeds from different websites and cache the output
<?php
/**
* WordPress "Multiblog"
*
* Combine multiple WP-API feeds sorted by date and cache the output via Transients API
*/
// Cache transients in database: https://codex.wordpress.org/Transients_API
$transient = 'wp_api_remote_posts_cache;
$content = get_transient( $transient ); // Try to get cached data
if ( empty( $content ) ) :
$response_mainsite = wp_remote_get( get_rest_url( null, 'wp/v2/posts ) );
$urls = array();
$urls[] = 'https://secondwebsite.com/wp-json/wp/v2/posts';
$urls[] = 'https://thirdwebsite.com/wp-json/wp/v2/posts';
if ( ! is_wp_error( $response_mainsite ) ) :
$data_mainsite = json_decode( wp_remote_retrieve_body( $response_mainsite ) );
endif;
if ( ! empty( $urls ) ) :
$data_mergedsites = array();
foreach ( $urls as $url ) {
$response_site = wp_remote_get( $url );
if ( ! is_wp_error( $response_site ) ) :
$data_site = json_decode( wp_remote_retrieve_body( $response_site ) );
//print_r( $data_site );
$data_mergedsites = array_merge( $data_mergedsites, $data_site );
endif;
}
// Merge data from main site with data from other sites
$recent_posts = array_merge( $data_mainsite, $data_mergedsites );
// Sort merged data by date
usort( $recent_posts, function ( $a, $b ) {
return strtotime( $b->date ) - strtotime( $a->date );
} );
else :
$recent_posts = $data_mainsite;
endif;
//print_r( $recent_posts );
if ( ! empty( $recent_posts ) ) :
$content .= '<ul class="recentposts">';
$i = 0;
foreach ( $recent_posts as $recent_post ) :
++$i;
// Limit to 10 posts
if ( $i <= 10 ) :
$content .= '<li>';
$content .= '<h4 class="widget-title"><a href="' . esc_url( $recent_post->link ) . '" rel="bookmark">' . esc_html( $recent_post->title->rendered ) . '</a></h4>';
$content .= '</li>';
endif;
endforeach;
$content .= '</ul>';
set_transient( $transient, $content, 12 * HOUR_IN_SECONDS ); // Cache data for 1/2 day
endif;
endif;
echo $content;
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