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unset

Description

The unset of Variable Handling for PHP unset a given variable.

Syntax

unset(
    mixed $var,
    mixed ...$vars
): void

Parameters

var

The variable to be unset.

vars

More variables.

Return

No value is returned.

Examples

1 · var · int

<?

$var = 1;

unset($var);

var_dump($var);

NULL

2 · var · array

<?

$var =
[
    0,
    1,
    2
];

unset($var);

var_dump($var);

NULL

3 · var · array · key · indexed

<?

$var =
[
    0,
    1,
    2
];

unset($var[1]);

print_r($var);

Array
(
    [0] => 0
    [2] => 2
)

4 · var · array · key · associative

<?

$var =
[
    "a" => 0,
    "b" => 1,
    "c" => 2
];

unset($var["b"]);

print_r($var);

Array
(
    [a] => 0
    [c] => 2
)

5 · vars

<?

$var1 = 1;
$var2 = 2;
$var3 = 3;

unset($var1, $var2, $var3);

var_dump($var1, $var2, $var3);

NULL
NULL
NULL