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<?php
/**
 * Dependencies API: Styles functions
 *
 * @since 2.6.0
 *
 * @package WordPress
 * @subpackage Dependencies
 */

/**
 * Initializes $wp_styles if it has not been set.
 *
 * @global WP_Styles $wp_styles
 *
 * @since 4.2.0
 *
 * @return WP_Styles WP_Styles instance.
 */
function wp_styles() {
	global $wp_styles;

if ( ! ( $wp_styles instanceof WP_Styles ) ) {
		$wp_styles = new WP_Styles();
	}

return $wp_styles;
}

/**
 * Displays 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.
 *
 * @since 2.6.0
 *
 * @param string|bool|array $handles Styles to be printed. Default 'false'.
 * @return string[] On success, an array of handles of processed WP_Dependencies items; otherwise, an empty array.
 */
function wp_print_styles( $handles = false ) {
	global $wp_styles;

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

if ( ! $handles ) {
		/**
		 * Fires before styles in the $handles queue are printed.
		 *
		 * @since 2.6.0
		 */
		do_action( 'wp_print_styles' );
	}

_wp_scripts_maybe_doing_it_wrong( __FUNCTION__ );

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

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

/**
 * Adds extra CSS styles to a registered stylesheet.
 *
 * Styles will only be added if the stylesheet is already in the queue.
 * Accepts a string $data containing the CSS. If two or more CSS code blocks
 * are added to the same stylesheet $handle, they will be printed in the order
 * they were added, i.e. the latter added styles can redeclare the previous.
 *
 * @see WP_Styles::add_inline_style()
 *
 * @since 3.3.0
 *
 * @param string $handle Name of the stylesheet to add the extra styles to.
 * @param string $data   String containing the CSS styles to be added.
 * @return bool True on success, false on failure.
 */
function wp_add_inline_style( $handle, $data ) {
	_wp_scripts_maybe_doing_it_wrong( __FUNCTION__, $handle );

if ( false !== stripos( $data, '</style>' ) ) {
		_doing_it_wrong(
			__FUNCTION__,
			sprintf(
				/* translators: 1: <style>, 2: wp_add_inline_style() */
				__( 'Do not pass %1$s tags to %2$s.' ),
				'<code><style></code>',
				'<code>wp_add_inline_style()</code>'
			),
			'3.7.0'
		);
		$data = trim( preg_replace( '#<style[^>]*>(.*)</style>#is', '$1', $data ) );
	}

return wp_styles()->add_inline_style( $handle, $data );
}

/**
 * Registers a CSS stylesheet.
 *
 * @see WP_Dependencies::add()
 * @link https://www.w3.org/TR/CSS2/media.html#media-types List of CSS media types.
 *
 * @since 2.6.0
 * @since 4.3.0 A return value was added.
 *
 * @param string           $handle Name of the stylesheet. Should be unique.
 * @param string|false     $src    Full URL of the stylesheet, or path of the stylesheet relative to the WordPress root directory.
 *                                 If source is set to false, stylesheet is an alias of other stylesheets it depends on.
 * @param string[]         $deps   Optional. An array of registered stylesheet handles this stylesheet depends on. Default empty array.
 * @param string|bool|null $ver    Optional. String specifying stylesheet version number, if it has one, which is added to the URL
 *                                 as a query string for cache busting purposes. If version is set to false, a version
 *                                 number is automatically added equal to current installed WordPress version.
 *                                 If set to null, no version is added.
 * @param string           $media  Optional. The media for which this stylesheet has been defined.
 *                                 Default 'all'. Accepts media types like 'all', 'print' and 'screen', or media queries like
 *                                 '(orientation: portrait)' and '(max-width: 640px)'.
 * @r