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How do you check if a variable has NOT been set in PHP?

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How do you check if a variable has NOT been set in PHP?
posted Feb 26, 2015 by Vrije Mani Upadhyay

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1 Answer

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You can use check for isset() but i would rather check also for not blank character with != ''

bool isset ( mixed $var [, mixed $... ] )

Determine if a variable is set and is not NULL.

If a variable has been unset with unset(), it will no longer be set. isset() will return FALSE if testing a variable that has been set to NULL. Also note that a NULL byte ("\0") is not equivalent to the PHP NULL constant.

If multiple parameters are supplied then isset() will return TRUE only if all of the parameters are set. Evaluation goes from left to right and stops as soon as an unset variable is encountered.

answer Feb 27, 2015 by Amit Kumar Pandey
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