Allow HTML tags in Widget Titles Insert tags with [ ] instead of < >

allow-widget-title-html.php

/**
	 * Allow HTML in Widget Titles
	 */
	function html_widget_title( $title ) {
		//HTML tag opening/closing brackets
		$title = str_replace( '[', '<', $title );
		$title = str_replace( '[/', '</', $title );
		// bold -- changed from 's' to 'strong' because of strikethrough code
		$title = str_replace( 'strong]', 'strong>', $title );
		$title = str_replace( 'b]', 'b>', $title );
		// italic
		$title = str_replace( 'em]', 'em>', $title );
		$title = str_replace( 'i]', 'i>', $title );

		// br
		$title = str_replace( 'br/]', 'br/>', $title );

		// underline
		// $title = str_replace( 'u]', 'u>', $title ); // could use this, but it is deprecated so use the following instead
		$title = str_replace( '<u]', '<span style="text-decoration:underline;">', $title );
		$title = str_replace( '</u]', '</span>', $title );
		// superscript
		$title = str_replace( 'sup]', 'sup>', $title );
		// subscript
		$title = str_replace( 'sub]', 'sub>', $title );
		// del
		$title = str_replace( 'del]', 'del>', $title ); // del is like strike except it is not deprecated, but strike has wider browser support -- you might want to replace the following 'strike' section to replace all with 'del' instead
		// strikethrough or <s></s>
		$title = str_replace( 'strike]', 'strike>', $title );
		$title = str_replace( 's]', 'strike>', $title ); // <s></s> was deprecated earlier than so we will convert it
		$title = str_replace( 'strikethrough]', 'strike>', $title ); // just in case you forget that it is 'strike', not 'strikethrough'
		// tt
		$title = str_replace( 'tt]', 'tt>', $title ); // Will not look different in some themes, like Twenty Eleven -- FYI: http://reference.sitepoint.com/html/tt
		// marquee
		$title = str_replace( 'marquee]', 'marquee>', $title );
		// blink
		$title = str_replace( 'blink]', 'blink>', $title ); // only Firefox and Opera support this tag
		// wtitle1 (to be styled in style.css using .wtitle1 class)
		$title = str_replace( '<wtitle1]', '<span class="wtitle1">', $title );
		$title = str_replace( '</wtitle1]', '</span>', $title );
		// wtitle2 (to be styled in style.css using .wtitle2 class)
		$title = str_replace( '<wtitle2]', '<span class="wtitle2">', $title );
		$title = str_replace( '</wtitle2]', '</span>', $title );

		return $title;
	}
	add_filter( 'widget_title', 'html_widget_title' );