Given an attachment ID for a header image, unsets it as a user-uploaded header image for the active theme.

Description

Triggered when the user clicks the overlay "X" button next to each image choice in the Customizer’s Header tool.

Source

public function ajax_header_remove() {
	check_ajax_referer( 'header-remove', '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();
	delete_post_meta( $attachment_id, $key );
	delete_post_meta( $attachment_id, '_wp_attachment_is_custom_header', get_stylesheet() );

	wp_send_json_success();
}

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