你读过这篇帖子吗？Display all posts starting with given letter?

这可不简单WP_Query 这很不幸，因为这将有助于保持分页。

// Rules
$args = [\'post_type\'=>\'post\',\'orderby\'=>\'name\'];

// The Query
$query1 = new WP_Query( $args );

// The Loop
while ( $query1->have_posts() ) {
    $query1->the_post();
    echo \'<li>\' . get_the_title() . \'</li>\';
}

You could use wpdb

global $wpdb;
$results = $wpdb->get_results( "SELECT ID FROM wp_posts WHERE post_title LIKE \'B%\';", ARRAY_A );

// Rules
$args = [\'post_type\'=>\'post\',\'post__in\'=>$results];

// The Query
$query1 = new WP_Query( $args );

// The Loop
while ( $query1->have_posts() ) {
    $query1->the_post();
    echo \'<li>\' . get_the_title() . \'</li>\';
}