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Assume the following files:
a.php
b.php
c.php
a.php includes c.php
b.php includes c.php
a.php includes b.php
This makes a.php include c.php twice.
Is there any way to remove this conflict?
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.
Ref: include_once()