Shell Programming and Scripting

Greetings!

My first PHP question; and, no doubt, a "no-brainer" for the initiated

The question centers around the proper syntax for input field labeling. The snippet which puzzles me (and the candidate which I wish to modify) goes like this:

Code:

<?php _e('Hello World'); ?>:<br />

What I'd like to understand is why the effort to punctuate with the colon thusly ?>: as opposed to simply forming the line as

Code:

<?php _e('Hello World:'); ?><br />

In extension, I reasoned that putting an ellipsis in might look like this

Code:

<?php _e('Hello World...'); ?><br />

and/or this

Code:

<?php _e('...Hello World'); ?><br />

...but this is scripting after all; and I don't want to unwittingly "slip on the soap" somewhere.

A bit of quick insight on these points would be quite appreciated

Thanks!