[Vinney]

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and

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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,

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

[Ajay]

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

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