PeekAndPoke / psi

src/Psi/IsDateString.php

<?php
/**
 * File was created 01.10.2015 18:02
 *
 * @author Karsten J. Gerber <kontakt@karsten-gerber.de>
 */

namespace PeekAndPoke\Component\Psi\Psi;

use PeekAndPoke\Component\Psi\UnaryFunction;

/**
 * IsDateString checks whether the given string is a valid ISO_8601 date string
 *
 * @see    IsDateStringTest
 *
 * @author Karsten J. Gerber <kontakt@karsten-gerber.de>
 */
class IsDateString implements UnaryFunction
{
    /**
     * @param mixed $input
     *
     * @return bool
     */
    public function __invoke($input)
    {
        return self::isValidDateString($input);
    }

    /**
     * @param string $str
     *
     * @return bool
     */
    public static function isValidDateString($str)
    {
        if (! is_string($str)) {

The condition is_string($str) is always true.

            return false;
        }

        return strtotime($str) !== false ||
               preg_match('/^(\d{4})-(\d{2})-(\d{2})T((\d{2}):(\d{2}):(\d{2})(\.\d{1-6}(Z)?)?([+-]\d{2}:\d{2})?)$/', $str);
    }
}