一种直接的方法 - SELECT在WordPress数据库抽象API中使用直接SQL 语句:
$wpdb->get_var(
    $wpdb->prepare("
        SELECT    ID
            FROM  $wpdb->posts
            WHERE post_title = %s
              AND post_type = '%s'
    ", $title, $type)
);
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您可以将其合并到一个函数中(您可以放在functions.php文件中):
function get_post_by_title($title, $type = 'post') {
    global $wpdb;
    $post_id = $wpdb->get_var(
        $wpdb->prepare("
            SELECT    ID
                FROM  $wpdb->posts
                WHERE post_title = %s
                  AND post_type = '%s'
        ", $title, $type)
    );
    if(!empty($post_id)) {
        return(get_post($post_id));
    }
}
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在您的模板中,您可以将这些功能称为:
$attachment = get_post_by_title('Filename', 'attachment');
echo $attachment->guid; // this is the "raw" URL
echo get_attachment_link($attachment->ID); // this is the "pretty" URL
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