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Programming PHP, 3rd Edition by Peter MacIntyre, Kevin Tatroe, Rasmus Lerdorf

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Name

define

Synopsis

bool define(string name, mixed value[, int case_insensitive])

Defines a constant named name and sets its value to value. If case_insensitive is set and is true, the operation fails if a constant with the same name, compared case insensitively, is previously defined. Otherwise, the check for existing constants is done case sensitively. Returns true if the constant could be created, or false if a constant with the given name already exists.

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