What does <?php endif; ?> mean ?

<?php endif; ?> is there a lots of places in wordpress
what does it instruct/mean in the program ?

 

Its does exactly what it says it ends the if, it tell the php parser; that the if (...): closes when endif; is declared.

Example:

<?php

//start if statement...
if ($username == "danx10") :

//execute following code...
echo "Hello ". $username;

//end/close the if statement...
endif;

?>

PHP:

As you can see from the above example it will execute everything between if(...): up until endif;

 

Check out here. It's used a lot in Wordpress because of the amount of HTML - it makes it easier to distinguish what blocks of code are ending rather than the ambiguous curly brace (which could be closing any block).

 

In additional to the above support: http://php.net/manual/en/control-structures.elseif.php

 

i think it is an alternative of { }