笨開始和結束日期驗證

Question

我得到準確的結果，如果我設定開始日期和結束日期時，年份是2017年。但是，當開始日期15月-2016到15日至2017年它不工作，並顯示錯誤MESSAGE-

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

這裏是我的代碼

 $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); 
     } 

有什麼解決方案來擺脫這個問題的？請幫助...

Answer 1

PHP不知道你的字符串是什麼，如果值從發佈的數據到來，那麼他們都是字符串：

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

相反，你需要爲創建datetime對象的比較

$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'; 

試試這段代碼並改變日期，你會看到我是對的。

UPDATE：

從技術上講，你也可以使用的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';