WordPress at a glance
function is not described

wp_print_styles() WP 2.6.0

Display styles that are in the $handles queue.

Passing an empty array to $handles prints the queue, passing an array with one string prints that style, and passing an array of strings prints those styles.

  • Global. WP_Styles. $wp_styles The WP_Styles object for printing styles.
Hooks in function
Return

Array. On success, a processed array of WP_Dependencies items; otherwise, an empty array.

Usage

wp_print_styles( $handles );
$handles(string/true/false/array)
Styles to be printed.
Default: 'false'

Code of wp print styles: wp-includes/functions.wp-styles.php WP 5.2.2

<?php
function wp_print_styles( $handles = false ) {
	if ( '' === $handles ) { // for wp_head
		$handles = false;
	}
	/**
	 * Fires before styles in the $handles queue are printed.
	 *
	 * @since 2.6.0
	 */
	if ( ! $handles ) {
		do_action( 'wp_print_styles' );
	}

	_wp_scripts_maybe_doing_it_wrong( __FUNCTION__ );

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

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