Created
April 3, 2018 09:38
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function rp4wp_force_same_category( $sql, $post_id, $post_type ) { | |
global $wpdb; | |
if ( 'post' !== $post_type ) { | |
return $sql; | |
} | |
$sql_replace = " | |
INNER JOIN " . $wpdb->term_relationships . " ON (R.`post_id` = " . $wpdb->term_relationships . ".object_id) | |
INNER JOIN " . $wpdb->term_taxonomy . " ON (" . $wpdb->term_relationships . ".term_taxonomy_id = " . $wpdb->term_taxonomy . ".term_taxonomy_id) | |
WHERE 1=1 | |
AND " . $wpdb->term_taxonomy . ".taxonomy = 'post_tag' | |
AND " . $wpdb->term_taxonomy . ".term_id IN ( SELECT TT.term_id FROM " . $wpdb->term_taxonomy . " TT INNER JOIN " . $wpdb->term_relationships . " TR ON TR.term_taxonomy_id = TT.term_taxonomy_id WHERE TR.object_id = " . $post_id . " ) | |
"; | |
return str_ireplace( 'WHERE 1=1', $sql_replace, $sql ); | |
} | |
add_filter( 'rp4wp_get_related_posts_sql', 'rp4wp_force_same_category', 11, 3 ); |
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