filter_has_var()
filter_has_var() — Checks if a variable of the specified type exists.
Built-in function of PHP 8.5. The manual lists it as available in PHP 5 >= 5.2.0, PHP 7, PHP 8. This page is the reference card: signature, parameters and return value, plus the changelog and the example the manual provides.
Signature
filter_has_var(int $input_type, string $var_name): bool
Parameters
| Parameter | Type | What it takes |
|---|---|---|
| $input_type | int | One of INPUT_GET, INPUT_POST, INPUT_COOKIE, INPUT_SERVER, or INPUT_ENV. |
| $var_name | string | Name of a variable to check. |
Return value
Returns true on success or false on failure.
Example
The PHP manual ships no example for filter_has_var(); the signature and the parameter table above are the contract.
All PHP 8.5 built-in functions
Reference card built from the PHP manual page filter_has_var() (PHP documentation, CC BY 3.0). The page is generated from the manual, so the wording of the parameter and return value text follows php.net.