Question

How to find whether a variable is NULL in PHP

Answer 1

$n = 300;

var_dump(is_null($n));

/*
run: 

bool(false)  

*/

 

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Answer 2

$n = null;

var_dump(is_null($n));

/*
run: 

bool(true)  

*/

 

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Answer 3

var_dump(is_null($n));

/*
run: 

Notice: Undefined variable: n in C:\xampp\htdocs\allonpage.com\test.php on line 8
bool(true)  

*/

 

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