filter_id()
filter_id() — Returns the filter ID belonging to a named filter.
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_id(string $name): int|false
Parameters
| Parameter | Type | What it takes |
|---|---|---|
| $name | string | Name of a filter to get. |
Return value
ID of a filter on success or false if filter doesn't exist.
Example
The PHP manual ships no example for filter_id(); the signature and the parameter table above are the contract.
See also
All PHP 8.5 built-in functions
Reference card built from the PHP manual page filter_id() (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.