数据库发生错误。

<?php

namespace Contactable\SWV;

class DayofweekRule extends Rule {

	const rule_name = 'dayofweek';

	public function matches( $context ) {
		if ( false === parent::matches( $context ) ) {
			return false;
		}

		if ( empty( $context['text'] ) ) {
			return false;
		}

		return true;
	}

	public function validate( $context ) {
		$input = $this->get_default_input();
		$input = wpcf7_array_flatten( $input );
		$input = wpcf7_strip_whitespaces( $input );
		$input = wpcf7_exclude_blank( $input );

		$acceptable_values = (array) $this->get_property( 'accept' );
		$acceptable_values = array_map( 'intval', $acceptable_values );
		$acceptable_values = array_filter( $acceptable_values );
		$acceptable_values = array_unique( $acceptable_values );

		foreach ( $input as $i ) {
			if ( wpcf7_is_date( $i ) ) {
				$datetime = date_create_immutable( $i, wp_timezone() );
				$dow = (int) $datetime->format( 'N' );

				if ( ! in_array( $dow, $acceptable_values, true ) ) {
					return $this->create_error();
				}
			}
		}

		return true;
	}

}