サムネイルを上つら　中心　切り抜き　ファンクション

//サムネイルを上つら　中心
function my_awesome_image_resize_dimensions( $payload, $orig_w, $orig_h, $dest_w, $dest_h, $crop ){
    if( false ) return $payload;
 
    if ( $crop ) {
        $aspect_ratio = $orig_w / $orig_h;
        $new_w = min($dest_w, $orig_w);
        $new_h = min($dest_h, $orig_h);
 
        if ( !$new_w ) $new_w = intval($new_h * $aspect_ratio);
        if ( !$new_h ) $new_h = intval($new_w / $aspect_ratio);
 
        $size_ratio = max($new_w / $orig_w, $new_h / $orig_h);
        $crop_w = round($new_w / $size_ratio);
        $crop_h = round($new_h / $size_ratio);
 
        $s_x = ($orig_w - $crop_w) / 2;
        $s_y = 0;
    } else {
        $crop_w = $orig_w;
        $crop_h = $orig_h;
 
        $s_x = ($orig_w - $crop_w) / 2;
        $s_y = 0;
 
        list( $new_w, $new_h ) = wp_constrain_dimensions( $orig_w, $orig_h, $dest_w, $dest_h );
    }
 
    if ( $new_w >= $orig_w && $new_h >= $orig_h ) return false;
    return array( 0, 0, (int) $s_x, (int) $s_y, (int) $new_w, (int) $new_h, (int) $crop_w, (int) $crop_h );
}
add_filter( 'image_resize_dimensions', 'my_awesome_image_resize_dimensions', 10, 6 );

custom.phpにあるみたい