Controller.php

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<?php
class Controller
{
    public function chkYmd($dt)
    {
        $dt  = str_replace('/', '-', $dt);
        $ymd = explode('-', $dt);
 
        if (empty($ymd[2])) {
            return false;
        }
 
        return checkdate($ymd[1], $ymd[2], $ymd[0]);
    }
}