Question

How to determine whether a variable is empty in PHP

Answer 1

$var = 0;

if (empty($var)) 
    echo '$var is 0, empty, or not set';


/*
run: 

$var is 0, empty, or not set 

*/

 

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Answer 2

$var = 99;

if (empty($var)) 
    echo '$var is 0, empty, or not set';
else
    echo '$var is not empty';


/*
run: 

$var is not empty 

*/

 

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Answer 3

$var = 0;

if (isset($var)) 
    echo '$var is set but it is empty';


/*
run: 

$var is set but it is empty 

*/

 

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