WordPress at a glance
action is not described

wp_print_scripts action-hook . WP 1.0

This action is documented in wp-includes/functions.wp-scripts.php

Usage

add_action( 'wp_print_scripts', 'action_function_name_4355' );
function action_function_name_4355(){
	// action...
}

Где вызывается хук

print_head_scripts()
wp_print_scripts
wp_print_head_scripts()
wp_print_scripts
wp_print_scripts()
wp_print_scripts
wp-includes/script-loader.php 1832
do_action( 'wp_print_scripts' );
wp-includes/script-loader.php 1950
do_action( 'wp_print_scripts' );
wp-includes/functions.wp-scripts.php 95
do_action( 'wp_print_scripts' );

Где используется хук в ядре WordPress

wp-includes/default-filters.php 514
add_filter( 'wp_print_scripts', 'wp_just_in_time_script_localization' );