isset(null) code example
Example 1: php see if undefined
if (isset($variable)) { /* do something */ };Example 2: isset in php
$age = 0;
// Evaluates as true because $age is set
if (isset($age)) {
echo '$age is set even though it is empty';
}if (isset($variable)) { /* do something */ };$age = 0;
// Evaluates as true because $age is set
if (isset($age)) {
echo '$age is set even though it is empty';
}