Source

File: wp-includes/script-loader.php

function print_footer_scripts() {
	global $wp_scripts, $concatenate_scripts;

	if ( ! ( $wp_scripts instanceof WP_Scripts ) ) {
		return array(); // No need to run if not instantiated.
	}
	script_concat_settings();
	$wp_scripts->do_concat = $concatenate_scripts;
	$wp_scripts->do_footer_items();

	/**
	 * Filters whether to print the footer scripts.
	 *
	 * @since 2.8.0
	 *
	 * @param bool $print Whether to print the footer scripts. Default true.
	 */
	if ( apply_filters( 'print_footer_scripts', true ) ) {
		_print_scripts();
	}

	$wp_scripts->reset();
	return $wp_scripts->done;
}