← All built-ins / isset()
isset()
isset(...$args): bool
Parameters
| Name | Type | Description |
|---|---|---|
| $var | mixed | variable or array element |
Return value
true when the variable is set and not null.
Example
$m = ["k" => 1]; var_dump(isset($m["k"])); var_dump(isset($m["missing"]));
bool(true) bool(false)