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Edit File: NumberStepRule.php

<?php namespace WPDesk\FCF\Free\Validator\Rule; use WPDesk\FCF\Free\Settings\Option\ValueStepOption; use WPDesk\FCF\Free\Validator\Error\NumberStepError; /** * Checks step param for number value. */ class NumberStepRule implements ValidatorRule { /** * {@inheritdoc} */ public function validate_value( string $value, array $field_data ) { $number_step = $field_data[ ValueStepOption::FIELD_NAME ] ?: 1; if ( ( $value === '' ) || ( $value % $number_step === 0 ) ) { return null; } return new NumberStepError( $field_data, $value ); } }