Rational addition of image sizes (Wordpress)

<?php
// Vladimir Zhelnov // neatek.ru // neatek.pw
// functions.php (Wordpress)

function theme_add_image(){

    // Here is your sizes.
    // usage in theme : the_post_thumbnail('538x342'); as in array, always => size - 'VALUE1xVALUE2'
    $sizes = array(
        [538, 342],
        [209, 117],
        // [WIDTH, HEIGHT],
        // any new size [WIDTH, HEIGHT],
    );

    foreach ($sizes as $key => $value) {
        add_image_size( $value[0].'x'.$value[1], $value[0], $value[1], true );
    }

}

add_action( 'init', 'theme_add_image' );