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
Links
Variable Handling
- boolval
- debug_zval_dump
- doubleval
- empty
- floatval
- get_debug_type
- get_defined_vars
- get_resource_id
- get_resource_type
- gettype
- intval
- is_array
- is_bool
- is_callable
- is_countable
- is_double
- is_float
- is_int
- is_integer
- is_iterable
- is_long
- is_null
- is_numeric
- is_object
- is_real
- is_resource
- is_scalar
- is_string
- isset
- print_r
- serialize
- settype
- strval
- unserialize
- var_dump
- var_export