apply_filters( 'wp_calculate_image_srcset', array $sources, array $size_array, string $image_src, array $image_meta, int $attachment_id )

Parameters

$sources

(array) One or more arrays of source data to include in the 'srcset'.

• 'width'
  (array)
  • 'url'
    (string) The URL of an image source.
  • 'descriptor'
    (string) The descriptor type used in the image candidate string, either 'w' or 'x'.
  • 'value'
    (int) The source width if paired with a 'w' descriptor, or a pixel density value if paired with an 'x' descriptor.

$size_array

(array) An array of requested width and height values.

• (int) The width in pixels.
• '1'
  (int) The height in pixels.

$image_src

(string) The 'src' of the image.

$image_meta

(array) The image meta data as returned by 'wp_get_attachment_metadata()'.

$attachment_id

(int) Image attachment ID or 0.