Multiple choice

_________ determines whether a variable is a set.

  1. isset

  2. set

  3. exist

  4. none of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

isset() is a PHP language construct that determines whether a variable is set and is not NULL. It returns true if the variable exists and has a value other than NULL. This is commonly used to check if form fields or array keys have been initialized before using them.

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