Exceptions

Exceptions

Every exception the package throws lives under InitPHP\Validation\Exception and implements the marker interface ExceptionInterface, so you can catch them all at once.

Throwable
└── ExceptionInterface (interface)
    ├── ValidationException        (extends \RuntimeException)
    │   ├── UndefinedRuleException
    │   └── LocaleException
    └── InvalidArgumentException   (extends \InvalidArgumentException)

A failed validation is not an exception — it is the normal false return of validation(), with messages in getError(). Exceptions are reserved for configuration and programming errors.

UndefinedRuleException

Thrown by validation() when a string rule names a rule that is neither built-in nor registered with extend(). Unknown rules fail loudly rather than silently passing — a misspelled rule is a bug, not a valid field.

use InitPHP\Validation\Exception\UndefinedRuleException;

$v->rule('age', 'integerr');   // typo
try {
    $v->validation();
} catch (UndefinedRuleException $e) {
    echo $e->getMessage();     // 'The validation rule "integerr" is not defined.'
}

InvalidArgumentException

Thrown by rule() when a key or rule entry has an unsupported type — for example an array rule entry that is neither a string nor a callable. It extends the SPL \InvalidArgumentException and also implements ExceptionInterface.

use InitPHP\Validation\Exception\InvalidArgumentException;

try {
    $v->rule('age', [123]);   // 123 is not a string or callable
} catch (InvalidArgumentException $e) {
    // ...
}

LocaleException

Thrown by setLocale() and setLocaleDir() when a locale cannot be loaded: the directory does not exist, the file is missing, or the file does not return an array.

use InitPHP\Validation\Exception\LocaleException;

try {
    $v->setLocale('xx');
} catch (LocaleException $e) {
    // could not find the language file
}

Catching everything

use InitPHP\Validation\Exception\ExceptionInterface;

try {
    $v->rule('age', 'integer')->validation();
} catch (ExceptionInterface $e) {
    // any failure originating from InitPHP Validation
}

Next

• API Reference — which method throws what.
• Troubleshooting — common causes and fixes.