PHP isset Example | PHP isset() Function Tutorial is today’s topic. The isset () function is used to check whether a variable is set or not. If the variable is already unset with unset() function, it will no longer be set. The isset() function is the inbuilt function in PHP which checks whether a variable is set and is not NULL. The isset() function returns false if the testing variable contains a NULL.

PHP isset()

PHP isset function accepts only variable references as its arguments and not any direct values. The isset() function returns TRUE if a given variable is set to any value including the empty string.

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