ISSET AND UNSET IN PHP

isset( ) – Using this function we can check whether the function is set with any value or not.

Example –

<?php

$x=100;

echo isset($x); // 1 (true)

echo isset($y); // nothing (false)

?>

Output –

1

unset( ) – Using this function we can delete the value of variable.

Example –

<?php

$x=100;

unset($x);

echo isset($x);

?>