Get attachment attributes by URL

function get_attachment_attr_by_url( $image_url ) {
    $uploads = wp_upload_dir();
    $relative_url = str_replace( $uploads['baseurl'] . '/', '', $image_url );

    $query = new WP_Query( array(
        'post_type'      => 'attachment',
        'post_status'    => 'any',
        'fields'         => 'ids',
        'posts_per_page' => 1,
        'meta_query' => array(
            array(
                'key'     => '_wp_attached_file',
                'value'   => $relative_url,
                'compare' => 'LIKE'
            )
        )
    ) );

    $attachment_id = current( $query->posts );
    if ( ! $attachment_id ) {
        return false;
    }

    $attr = array(
        'alt' => trim( strip_tags( get_post_meta( $attachment_id, '_wp_attachment_image_alt', true ) ) ),
        'title' => get_the_title( $attachment_id )
    );

    return $attr;
}