wp_get_attachment_metadata() WP 1.0

Retrieve attachment meta field for attachment ID.

Is the basis for: image_get_intermediate_size()

Works based on: get_post_meta()

✈ 1 time = 0.000745s = slow | 50000 times = 1.22s = fast | PHP 7.0.8, WP 4.6

Hooks from the function

wp_get_attachment_metadata

Return

Mixed. Attachment meta field. False on failure.

Usage

wp_get_attachment_metadata( $attachment_id, $unfiltered );

$attachment_id(int): Attachment post ID.
Default: global $post
$unfiltered(true/false): If true, filters are not run.
Default: false

Changelog

Since 2.1.0

Introduced.

Code of wp get attachment metadata: `wp-includes/post.php` ^{WP 5.4.2}

<?php
function wp_get_attachment_metadata( $attachment_id = 0, $unfiltered = false ) {
	$attachment_id = (int) $attachment_id;
	$post          = get_post( $attachment_id );
	if ( ! $post ) {
		return false;
	}

	$data = get_post_meta( $post->ID, '_wp_attachment_metadata', true );

	if ( $unfiltered ) {
		return $data;
	}

	/**
	 * Filters the attachment meta data.
	 *
	 * @since 2.1.0
	 *
	 * @param array|bool $data          Array of meta data for the given attachment, or false
	 *                                  if the object does not exist.
	 * @param int        $attachment_id Attachment post ID.
	 */
	return apply_filters( 'wp_get_attachment_metadata', $data, $post->ID );
}