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Manual: defined
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defined

defined -- Checks whether a given named constant exists.

Description

int defined(string name);

Returns TRUE if the named constant given by name has been defined, false otherwise.

See also define() and the section on Constants.


User Contributed Notes: defined

barwick@gmx.de
21-Feb-2000 07:10
 If you're looking for a function to tell whether a variable exists, look at isset(). defined() is relevant only for constants.


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