wp_add_inline_style() WP 1.0

Add 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.

Works based on: wp_styles()

No Hooks.

Return

true/false. True on success, false on failure.

Usage

wp_add_inline_style( $handle, $data );

$handle(string) (required): Name of the stylesheet to add the extra styles to.
$data(string) (required): String containing the CSS styles to be added.

Notes

See: WP_Styles::add_inline_style()

Changelog

Since 3.3.0

Introduced.

Code of `wp_add_inline_style() wp add inline style` ^{WP 5.5.1}

wp-includes/functions.wp-styles.php

<?php
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>&lt;style&gt;</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 );
}

From tag: styles (include files)

wp_style_is()