Wrapper for wp_head() which manages SSL

pilau_wp_head.php

/**
 * Wrapper for wp_head() which manages SSL
 *
 * @uses	wp_head()
 * @param	bool	$ssl
 * @return	void
 */
function pilau_wp_head( $ssl = false ) {

	if ( ! $ssl || WP_LOCAL_DEV ) {

		// Just output
		wp_head();

	} else {

		// Capture wp_head output with buffering
		ob_start();
		wp_head();
		$wp_head = ob_get_contents();
		ob_end_clean();

		// Replace plain protocols
		$wp_head = preg_replace( '/(["\'])http:\/\//', '\1https://', $wp_head );

		// Replace specific URLs
		$wp_head = str_replace( '//w.sharethis.com', '//ws.sharethis.com', $wp_head );

		// Output
		echo $wp_head;

	}

}