Answer Posted / arvind pippal

. The include_once() statement includes and evaluates the
specified file during the execution of the script. This is
a behavior similar to the include() statement, with the
only difference being that if the code from a file has
already been included, it will not be included again. As
the name suggests, it will be included just once.
include_once() should be used in cases where the same file
might be included and evaluatedmore than once during a
particularexecution of a script, and you want to be sure
that it is included exactly once to avoid problems with
function redefinitions, variable value reassignments, etc.
require_once() should be used in cases where the same file
might be included and evaluatedmore than once during a
particular execution of a script, and you want to be sure
that it is included exactly once to avoid problems with
function redefinitions, variable value reassignments, etc.

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