adjacent_image_link() WP 2.5.0

Displays next or previous image link that has the same post parent.

Retrieves the current attachment object from the $post global.

Hooks in function

Return

Nothing (null).

Usage

adjacent_image_link( $prev, $size, $text );

$prev(true/false)

Whether to display the next (false) or previous (true) link.
Default: true

$size(string/array)

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

$text(true/false)

Link text.
Default: false

Code of adjacent image link: wp-includes/media.php ^{VER 5.0.3}

<?php
function adjacent_image_link( $prev = true, $size = 'thumbnail', $text = false ) {
	$post = get_post();
	$attachments = array_values( get_children( array( 'post_parent' => $post->post_parent, 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => 'ASC', 'orderby' => 'menu_order ID' ) ) );

	foreach ( $attachments as $k => $attachment ) {
		if ( $attachment->ID == $post->ID ) {
			break;
		}
	}

	$output = '';
	$attachment_id = 0;

	if ( $attachments ) {
		$k = $prev ? $k - 1 : $k + 1;

		if ( isset( $attachments[ $k ] ) ) {
			$attachment_id = $attachments[ $k ]->ID;
			$output = wp_get_attachment_link( $attachment_id, $size, true, false, $text );
		}
	}

	$adjacent = $prev ? 'previous' : 'next';

	/**
	 * Filters the adjacent image link.
	 *
	 * The dynamic portion of the hook name, `$adjacent`, refers to the type of adjacency,
	 * either 'next', or 'previous'.
	 *
	 * @since 3.5.0
	 *
	 * @param string $output        Adjacent image HTML markup.
	 * @param int    $attachment_id Attachment ID
	 * @param string $size          Image size.
	 * @param string $text          Link text.
	 */
	echo apply_filters( "{$adjacent}_image_link", $output, $attachment_id, $size, $text );
}