unset

void unset ( $zmienna )

Deletes a variable. The variable cannot be accessed after this function is called.

Example:

$zmienna = "text";
if (!empty($zmienna)) {
print($zmienna."\n");
}

unset($zmienna);

if (!empty($zmienna)) {
print($zmienna."\n");
}

Result:

text

The second result line is empty because the variable no longer exists and has no accessible value.