Web Reference: If multiple parameters are supplied then isset () will return true only if all of the parameters are considered set. Evaluation goes from left to right and stops as soon as an unset variable is encountered. The isset () function checks whether a variable is set, which means that it has to be declared and is not NULL. This function returns true if the variable exists and is not NULL, otherwise it returns false. In this tutorial, you will learn how to use the PHP isset () construct to check if a variable is set and not null.
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