WordPress at a glance
function is not described

wp_print_scripts() WP 2.1.0

Prints scripts in document head that are in the $handles queue.

Called by admin-header.php and wp_head hook. Since it is called by wp_head on every page load, the function does not instantiate the WP_Scripts object unless script names are explicitly passed. Makes use of already-instantiated $wp_scripts global if present. Use provided wp_print_scripts hook to register/enqueue new scripts.

Hooks from the function
Return

String[]. On success, an array of handles of processed WP_Dependencies items; otherwise, an empty array.

Usage

wp_print_scripts( $handles );
$handles(string|true|false|array)
Scripts to be printed.
Default: 'false'

Notes

Changelog

Since 2.1.0 Introduced.

Code of wp_print_scripts() WP 5.7.2

<?php
function wp_print_scripts( $handles = false ) {
	global $wp_scripts;

	/**
	 * Fires before scripts in the $handles queue are printed.
	 *
	 * @since 2.1.0
	 */
	do_action( 'wp_print_scripts' );

	if ( '' === $handles ) { // For 'wp_head'.
		$handles = false;
	}

	_wp_scripts_maybe_doing_it_wrong( __FUNCTION__ );

	if ( ! ( $wp_scripts instanceof WP_Scripts ) ) {
		if ( ! $handles ) {
			return array(); // No need to instantiate if nothing is there.
		}
	}

	return wp_scripts()->do_items( $handles );
}