wp_get_attachment_image_sizes( int $attachment_id, array|string $size = 'medium', array $image_meta = null )

Retrieves the value for an image attachment’s ‘sizes’ attribute.

Description

Parameters

$attachment_id

(Required) Image attachment ID.

$size

(Optional) Image size. Accepts any valid image size, or an array of width and height values in pixels (in that order). Default 'medium'.

Default value: 'medium'

$image_meta

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

Default value: null

Return

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

Source

File: wp-includes/media.php

function wp_get_attachment_image_sizes( $attachment_id, $size = 'medium', $image_meta = null ) {
	if ( ! $image = wp_get_attachment_image_src( $attachment_id, $size ) ) {
		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_sizes( $size_array, $image_src, $image_meta, $attachment_id );
}

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Changelog

Changelog
Version	Description
WP-4.4.0	Introduced.