nesting if in html

[elibyy]

hey there i've opened the source code of PHPbb and i saw something real wired

<!-- INCLUDE overall_header.html -->

<p class="{S_CONTENT_FLOW_END}<!-- IF S_USER_LOGGED_IN --> rightside<!-- ENDIF -->"><!-- IF S_USER_LOGGED_IN -->{LAST_VISIT_DATE}<!-- ELSE -->{CURRENT_TIME}<!-- ENDIF --></p>
<!-- IF U_MCP --><p>{CURRENT_TIME} <br />[&nbsp;<a href="{U_MCP}">{L_MCP}</a>&nbsp;]</p><!-- ELSEIF S_USER_LOGGED_IN --><p>{CURRENT_TIME}</p><!-- ENDIF -->

<!-- IF S_DISPLAY_SEARCH or (S_USER_LOGGED_IN and not S_IS_BOT) -->
<ul class="linklist">
	<!-- IF S_DISPLAY_SEARCH -->
		<li><a href="{U_SEARCH_UNANSWERED}">{L_SEARCH_UNANSWERED}</a><!-- IF S_LOAD_UNREADS --> &bull; <a href="{U_SEARCH_UNREAD}">{L_SEARCH_UNREAD}</a><!-- ENDIF --><!-- IF S_USER_LOGGED_IN --> &bull; <a href="{U_SEARCH_NEW}">{L_SEARCH_NEW}</a><!-- ENDIF --> &bull; <a href="{U_SEARCH_ACTIVE_TOPICS}">{L_SEARCH_ACTIVE_TOPICS}</a></li>
	<!-- ENDIF -->
	<!-- IF not S_IS_BOT and U_MARK_FORUMS --><li class="rightside"><a href="{U_MARK_FORUMS}" accesskey="m">{L_MARK_FORUMS_READ}</a></li><!-- ENDIF -->
</ul>
<!-- ENDIF -->

<!-- INCLUDE forumlist_body.html -->

<!-- IF not S_USER_LOGGED_IN and not S_IS_BOT -->
	<form method="post" action="{S_LOGIN_ACTION}" class="headerspace">
	<h3><a href="{U_LOGIN_LOGOUT}">{L_LOGIN_LOGOUT}</a><!-- IF S_REGISTER_ENABLED -->&nbsp; &bull; &nbsp;<a href="{U_REGISTER}">{L_REGISTER}</a><!-- ENDIF --></h3>
		<fieldset class="quick-login">
			<label for="username">{L_USERNAME}:</label>&nbsp;<input type="text" name="username" id="username" size="10" class="inputbox" title="{L_USERNAME}" />
			<label for="password">{L_PASSWORD}:</label>&nbsp;<input type="password" name="password" id="password" size="10" class="inputbox" title="{L_PASSWORD}" />
			<!-- IF S_AUTOLOGIN_ENABLED -->
				| <label for="autologin">{L_LOG_ME_IN} <input type="checkbox" name="autologin" id="autologin" /></label>
			<!-- ENDIF -->
			<input type="submit" name="login" value="{L_LOGIN}" class="button2" />
			{S_LOGIN_REDIRECT}
		</fieldset>
	</form>
<!-- ENDIF -->

<!-- IF S_DISPLAY_ONLINE_LIST -->
	<!-- IF U_VIEWONLINE --><h3><a href="{U_VIEWONLINE}">{L_WHO_IS_ONLINE}</a></h3><!-- ELSE --><h3>{L_WHO_IS_ONLINE}</h3><!-- ENDIF -->
	<p>{TOTAL_USERS_ONLINE} ({L_ONLINE_EXPLAIN})<br />{RECORD_USERS}<br /> <br />{LOGGED_IN_USER_LIST}
	<!-- IF LEGEND --><br /><em>{L_LEGEND}: {LEGEND}</em><!-- ENDIF --></p>
<!-- ENDIF -->

<!-- IF S_DISPLAY_BIRTHDAY_LIST and BIRTHDAY_LIST -->
	<h3>{L_BIRTHDAYS}</h3>
	<p><!-- IF BIRTHDAY_LIST -->{L_CONGRATULATIONS}: <strong>{BIRTHDAY_LIST}</strong><!-- ELSE -->{L_NO_BIRTHDAYS}<!-- ENDIF --></p>
<!-- ENDIF -->

<!-- IF NEWEST_USER -->
	<h3>{L_STATISTICS}</h3>
	<p>{TOTAL_POSTS} &bull; {TOTAL_TOPICS} &bull; {TOTAL_USERS} &bull; {NEWEST_USER}</p>
<!-- ENDIF -->

<!-- INCLUDE overall_footer.html -->

as u can see they have added a if in the HTML script how do i do the same?

[pritaeas]

This is not HTML, but a template that gets parsed. What do you want to achieve ? See this thread for example.

[elibyy]

This is not HTML, but a template that gets parsed. What do you want to achieve ? See this thread for example.

thanks cool