wp_get_attachment_image_srcset() │ WP 4.4.0

Retrieves the value for an image attachment's 'srcset' attribute.

Uses: wp_calculate_image_srcset(), wp_get_attachment_image_src()
1 time — 0.001658 sec (very slow) | 50000 times — 35.26 sec (very slow)

No Hooks.

Return

String|false. A 'srcset' value string or false.

Usage

wp_get_attachment_image_srcset( $attachment_id, $size, $image_meta );
$attachment_id(int) (required)
Image attachment ID.
$size(string|int[])
Image size. Accepts any registered image size name, or an array of width and height values in pixels (in that order).
Default: 'medium'
$image_meta(array)
The image meta data as returned by wp_get_attachment_metadata().
Default: null

Notes

Changelog

Since 4.4.0 Introduced.

Code of wp_get_attachment_image_srcset() WP 5.9.3

wp-includes/media.php 
function wp_get_attachment_image_srcset( $attachment_id, $size = 'medium', $image_meta = null ) {
	$image = wp_get_attachment_image_src( $attachment_id, $size );

	if ( ! $image ) {
		return false;
	}

	if ( ! is_array( $image_meta ) ) {
		$image_meta = wp_get_attachment_metadata( $attachment_id );
	}

	$image_src  = $image[0];
	$size_array = array(
		absint( $image[1] ),
		absint( $image[2] ),
	);

	return wp_calculate_image_srcset( $size_array, $image_src, $image_meta, $attachment_id );
}

wp attachment image

Images