Codeigniter 开始和结束日期验证

Question

如果我将开始日期和结束日期设置为 2017 年，我会得到准确的结果。但是当开始日期在 15-October-2016 到 15-September-2017 它不工作并显示错误消息-

$error = "End date can't be older than begin date ";

这是我的代码

        $data['beginDate'] = $this->input->post('beginDate');
        $data['endDate'] = $this->input->post('endDate');

        if($data['endDate'] < $data['beginDate']){
            $error = "End date can't be older than begin date ";
            $this->session->set_flashdata('error', $error);
            redirect('/search');
        }
        else{
            $this->load->model('personhistory');
            $data['rets'] = $this->personhistory->searchDetails();
            $data['sum'] = $this->personhistory->searchDetailsSum();
            $data['title'] = "Search Details";
            $this->load->view('search_results', $data);
        }

有什么办法可以解决这个问题吗？请帮忙...

Answer 1

PHP 不知道您的字符串是什么，如果这些值来自发布的数据，那么它们就是字符串：

// These are strings
$s1 = '15-October-2016';
$s2 = '15-September-2016';

相反，您需要创建日期时间对象以进行比较

$d1 = new DateTime('15-October-2016');
$d2 = new DateTime('15-September-2016');

if( $d1 < $d2 )
    echo 'First date comes before the second date';

if( $d1 > $d2 )
    echo 'First date comes after the second date';

if( $d1 == $d2 )
    echo 'First date and second date are the same';

试试这个代码并改变日期，你会发现我是对的。

更新：

技术上你也可以使用 strtotime

<?php

$s1 = strtotime('15-October-2016');
$s2 = strtotime('15-September-2016');

if( $s1 < $s2 )
    echo 'First date comes before the second date';

if( $s1 > $s2 )
    echo 'First date comes after the second date';

if( $s1 == $s2 )
    echo 'First date and second date are the same';