File code/Controller/FormValidator.php

class Phad\FormValidator

public $throw_submission_error = false; I don't think this does anything. I really don't know, though.
public bool $allow_extra_fields = false; Set true to allow extra fields in the submission that are not defined in the form.
public $failedSubmitColumns = [];
protected $props = [];
public $validators = []; Set FormValidator->validators['key'] = function($property_value, $property_settings, &$errors). Also set <div validate="key"> to match ->validators['key']. Default validation will be ignored in this case.
protected array $attribute_validators = []; User-added attribute validators.

array<string attribute_name, callable $callable> key/value array of attribute_name => $callables.

public function __construct(array $properties=[])
public function addAttributeValidator(string $attribute_name, mixed $callable): bool Add an html attribute validator. Can overwrite built-in attribute validators or user-added attribute validators.

Define some-attribute="some_spec" on an html node and call addAttributeValidator('some-attribute', $callable).

public function validate(array $data, array $errors=[], array &$failed_columns[]): bool
public function validatePropTagname($tagName, $propValue)
public function validatePropRequired(bool $isRequired, $propValue)
public function validatePropType(string $type, $value)
public function validatePropMaxlength(int $maxLen, $propValue)
public function validatePropMinLength(int $minLen, $propValue)
public function validatePropOptions(array $options, $value)
public function validatePropPType(string $type, mixed $value): bool Validate the php data type. Declare p-type="array" or another type.
public function validatePropPNohtml(string $attribute_value, mixed $user_input_value) Validate that user input does not contain any html
public function validatePropPGreaterthan(string $target_value, mixed $user_input_value) Validate that user input is numerically greater than the target value. User value MUST be numeric (uses p-type=number validation)