whats the difference in these ??

[Vinney]

if (!isset($mainfile)) { include("mainfile.php"); }
global $Pmenu,$breadcrumb;


and


include ("mainfile.php");
global $Pmenu,$breadcrumb;


whats is the purpose of having the different methods ?

[mr e]

well the top one is just saying if $mainfile equals something, dont mess with it, but if it isn't set then make it equal something,

if (!isset($mainfile))

is just like saying "if $mainfile isn't set"

[Ajay]

if (!isset($mainfile))

[/QUOTE]
if the '$mainfile' variable is set, then include mainfile.php


include ("mainfile.php");

this just includes the mainfile.php and doesnt check if the '$mainfile' variable is set