Validates whether the input is a valid ISBN or not.
v::isbn()->assert('ISBN-13: 978-0-596-52068-7');
// Validation passes successfully
v::isbn()->assert('978 0 596 52068 7');
// Validation passes successfully
v::isbn()->assert('ISBN-12: 978-0-596-52068-7');
// → "ISBN-12: 978-0-596-52068-7" must be an ISBN
v::isbn()->assert('978 10 596 52068 7');
// → "978 10 596 52068 7" must be an ISBN
| Mode | Template |
|---|
default | {{subject}} must be an ISBN |
inverted | {{subject}} must not be an ISBN |
| Placeholder | Description |
|---|
subject | The validated input or the custom validator name (if specified). |
| Version | Description |
|---|
| 3.0.0 | Templates changed |
| 2.0.0 | Created |