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

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Name

filter_has_var

Synopsis

bool filter_has_var(int context, string name)

Returns true if a value named name exists in the specified context, or false if it doesn’t. The context is one of INPUT_GET, INPUT_POST, INPUT_COOKIE, INPUT_SERVER, or INPUT_ENV.

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