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                            https://blog.csdn.net/aiang4806/article/details/101250054

~~~
//兩個日期之間相差的天數
    function diffBetweenTwoDays ($day1, $day2)
    {
        $second1 = strtotime($day1);
        $second2 = strtotime($day2);

        if ($second1 < $second2) {
            $tmp = $second2;
            $second2 = $second1;
            $second1 = $tmp;
        }
        return ($second1 - $second2) / 86400;
    }
~~~

~~~
$day1 = "2013-07-27";
$day2 = "2013-08-04";
$diff = diffBetweenTwoDays($day1, $day2);
echo $diff."\n";
~~~
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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