这里我为您编写了一个函数。将以下功能放置在functions.php 或执行并将宽度和高度值传递给它的任何位置。它将返回图像大小名称string 如果没有找到，它就会返回false.

/**
 * Get name by size information for image.
 *
 * @global $_wp_additional_image_sizes
 * @uses   get_intermediate_image_sizes()
 * @return string $_sizes bool Data for passed measurements image.
 */
function wpse_243461_get_image_size_name( $w = 150, $h = 150 ) {
    global $_wp_additional_image_sizes;

    $sizes = array();
    foreach ( get_intermediate_image_sizes() as $_size ) {
        if ( in_array( $_size, array(\'thumbnail\', \'medium\', \'medium_large\', \'large\') ) ) {
            if ( $w == get_option( "{$_size}_size_w" ) && $h == get_option( "{$_size}_size_h" ))
                return $_size;
        } elseif ( isset( $_wp_additional_image_sizes[ $_size ] ) ) {
            if ( $w == $_wp_additional_image_sizes[ $_size ][\'width\'] && $h == $_wp_additional_image_sizes[ $_size ][\'height\'] )
                return $_size;
        }
    }

    return false;
}