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Which one of the following filter checks if the variable of the specified type exists?

Which one of the following filter checks if the variable of the specified type exists?

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asked Jul 28, 2021 in PHP by Evelyn (87.0k points)

Which one of the following filter checks if the variable of the specified type exists?

(a) filter_has_var

(b) filter_var

(c) filter_id

(d) filter_var_array

This question was posed to me by my school teacher while I was bunking the class.

My question is taken from PHP Filter topic in division Error Handling and Exception Handling in PHP of PHP

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1 Answer

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answered Jul 30, 2021 by Daniel (103k points)
selected Aug 3, 2021 by Evelyn

Best answer

Correct answer is (a) filter_has_var

Best explanation: The filter filter_has_var checks if the variable of the specified type exists. Whereas the function filter_id() returns filter ID of a specified filter name. The function filter_var() can validate and sanitize data. The function filter_var_array() can get multiple variables and it optionally filters them.

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