Core Function

wp_calculate_image_sizes()

 wp_calculate_image_sizes(
mixed $size,
    mixed $image_src = null,
    mixed $image_meta = null,
    mixed $attachment_id = 0
)

Creates a 'sizes' attribute value for an image.

Parameters 4 required

Name / Type	Description
mixed	(string \| int[]) $size Image size. Accepts any registered image size name, or an array of width and height values in pixels (in that order). Required
(string	\| null) $image_src Optional. The URL to the image file. Default null. Required
mixed	(array \| null) $image_meta Optional. The image meta data as returned by 'wp_get_attachment_metadata()'. Default null. Required
int	$attachment_id Optional. Image attachment ID. Either `$image_meta` or `$attachment_id` is needed when using the image size name as argument for `$size`. Default 0. Required

((string)

| false) A valid source size value for use in a 'sizes' attribute or false.

Since Version

4.4.0

Source File

wp-includes/media.php