記事ランダム①

記事ランダム①

function category_rand_orderby( $orderby, $query ){
    if ( !is_admin() && $query->is_main_query() ) {
        if ( $query->is_category() ) {
            $seed = strtotime( date( 'Y-m-d H:00:00' ) );
            mt_srand( $seed );
            $orderby = 'RAND(' . mt_rand() . ')';
        }
    }
    remove_filter( current_filter(), __FUNCTION__ );
    return $orderby;
}
 
add_filter( 'posts_orderby', 'category_rand_orderby', 10, 2 );

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function fix_rand_orderby( $orderby, $query ){
    if ( 'rand' == $query->get( 'orderby' ) ) {
        $seed = strtotime( date( 'Y-m-d H:00:00' ) );
        mt_srand( $seed );
        $orderby = 'RAND(' . mt_rand() . ')';
    }
    return $orderby;
}
 
add_filter( 'posts_orderby', 'fix_rand_orderby', 10, 2 );

---------------------

function category_rand_pre_get_posts( $query ) {
    if ( is_admin() || !$query->is_main_query() )
return;
 
    if ( $query->is_category() )
        $query->set( 'orderby', 'rand' );
}
 
add_action( 'pre_get_posts', 'category_rand_pre_get_posts' );