PHP unset() function

Syntax

unset($variable, $variable, ...);

Parameter	Description
Variable	One variable (required)

It returns true when successfully destroy the given variable.

unset function is used to destroy or delete one or more variable.

Note:

You can also use unset function to destroy the array variable.

You can use unset function to destroy the object.

<?php

$Name = 'ptutorial';
echo '
'; 
echo $Name;
unset($Name);

?>

ptutorial

$Name is a string variable that hold the ptutorial and print the variable.

And after use unset the $name variable. You cannot use the variable after unset.

<?php

$Name = 'ptutorial';
var_dump( isset($Name) );
unset($Name);
var_dump( isset($Name) );


?>

bool(true) bool(false)

Before unset it return true and after unset it return false.