日期及时间的计算

参考 http://php.net/manual/en/refs.calendar.php

function date_step_callback($callback, $start, $stop = null, $step = 'P1D'){
    $date1 = new DateTime($start);
    $date2 = new DateTime($stop);

    while($date1 < $date2){
        $start = $date1->format('Y-m-d');
        $date1->add(new DateInterval($step));

        $stop = $date1->format('Y-m-d');
        $callback($start, $stop);
    }
}

function date_step_callback($callback, $start, $stop = null, $step = 'P1D'){

$date1 = new DateTime($start);

$date2 = new DateTime($stop);

while($date1 < $date2){

$start = $date1->format('Y-m-d');

$date1->add(new DateInterval($step));

$stop = $date1->format('Y-m-d');

$callback($start, $stop);

}

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日期及时间的计算