www programming

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function w3all_ht_custom_image_srcset( $sources, $size_array, $image_src, $image_meta, $attachment_id ){

	$w = get_custom_header()->width;

// srcset val
		$sources[$w] = array(
				 'url'        => 'myurlimage.jpg',
				 'descriptor' => 'w',
				 'value'      => $w,
		);
			return $sources;
		
	}
	add_filter( 'wp_calculate_image_srcset', 'w3all_ht_custom_image_srcset', 10, 5 );