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Essentially, require() and include() act in much the same way in that they both include the contents of another file - the only difference being that if include() fails then processing will continue (but produce a warning) but if require() fails then processing will stop with a fatal error (as well as produce the warning).

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To define a constant, use the format:
define(constant_name,constant_value,case_insensitive)
e.g.
define(”MYCONSTANT”,”This is the value of the constant”,false);
print “Constant is ” . constant(”MYCONSTANT”);
?>

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