Function Hook_fields_isbn->is_valid_isbn
Definitions
sources/hooks/systems/fields/isbn.php
- Check if a provided code is valid ISBN-10 or ISBN-13.
- Visibility: protected
- Is abstract?: No
- Is static?: No
- Is final?: No
- Returns: bool
Parameters
| Name | Type | Passed by reference? | Variadic? | Default | Set | Range | Description |
|---|---|---|---|---|---|---|---|
| $isbn | string | No | No | required parameter | N/A | N/A | The ISBN code to check |
Returns
- Whether the ISBN code is valid
- Type: boolean
- Set: N/A
- Range: N/A
Preview
Code (PHP)
/**
* Check if a provided code is valid ISBN-10 or ISBN-13.
*
* @param string $isbn The ISBN code to check
* @return boolean Whether the ISBN code is valid
*/
protected function is_valid_isbn(string $isbn) : bool
* Check if a provided code is valid ISBN-10 or ISBN-13.
*
* @param string $isbn The ISBN code to check
* @return boolean Whether the ISBN code is valid
*/
protected function is_valid_isbn(string $isbn) : bool
