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Custom_Image_Header::ajax_header_add()

Given an attachment ID for a header image, updates its “last used” timestamp to now.

Description

Triggered when the user tries adds a new header image from the Media Manager, even if s/he doesn’t save that change.

Source

File: wp-admin/includes/class-custom-image-header.php 

public function ajax_header_add() {
		check_ajax_referer( 'header-add', 'nonce' );

		if ( ! current_user_can( 'edit_theme_options' ) ) {
			wp_send_json_error();
		}

		$attachment_id = absint( $_POST['attachment_id'] );
		if ( $attachment_id < 1 ) {
			wp_send_json_error();
		}

		$key = '_wp_attachment_custom_header_last_used_' . get_stylesheet();
		update_post_meta( $attachment_id, $key, time() );
		update_post_meta( $attachment_id, '_wp_attachment_is_custom_header', get_stylesheet() );

		wp_send_json_success();
	}

Uses

Uses Description
wp-includes/capabilities.php: current_user_can()

Returns whether the current user has the specified capability.
wp-includes/theme.php: get_stylesheet()

Retrieves name of the current stylesheet.
wp-includes/pluggable.php: check_ajax_referer()

Verifies the Ajax request to prevent processing requests external of the blog.
wp-includes/functions.php: wp_send_json_error()

Send a JSON response back to an Ajax request, indicating failure.
wp-includes/functions.php: absint()

Convert a value to non-negative integer.
wp-includes/functions.php: wp_send_json_success()

Send a JSON response back to an Ajax request, indicating success.
wp-includes/post.php: update_post_meta()

Updates a post meta field based on the given post ID.

Changelog

Version Description
3.9.0 Introduced.

© 2003–2019 WordPress Foundation
Licensed under the GNU GPLv2+ License.
https://developer.wordpress.org/reference/classes/custom_image_header/ajax_header_add