wp_add_inline_style( string $handle, string $data )

向注册的样式表添加额外的CSS样式。
Add extra CSS styles to a registered stylesheet.

说明（Description）

只有当样式表已经在队列中时，才会添加样式。接受包含CSS的字符串$data。如果将两个或多个CSS代码块添加到同一个stylesheet$handle中，它们将按添加的顺序打印，即后一个添加的样式可以重新声明前一个样式。另请参见WP_Styles::add_inline_style()

参数（Parameters）

源码（Source）

/**
 * Add extra CSS styles to a registered stylesheet.
 *
 * Styles will only be added if the stylesheet in 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. Must be lowercase.
 * @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__ );
 
    if ( false !== stripos( $data, '' ) ) {
        _doing_it_wrong( __FUNCTION__, __( 'Do not pass style tags to wp_add_inline_style().' ), '3.7' );
        $data = trim( preg_replace( '#]*>(.*)#is', '$1', $data ) );
    }
 
    return wp_styles()->add_inline_style( $handle, $data );
}