日历PHP-第一天出现错误 - Calendar PHP - error at first day

Calendar PHP - error at first day

本文关键字：错误第一天 PHP- 日历 | 更新日期: 2024-05-19

Javascript-函数启用切换月份

        function goLastMonth(month, year)
        {
            if (month == 1) 
            {
                --year;
                month = 13;
            }
            --month
            var monthstring= ""+month+"";
            var monthlength = monthstring.length;
            if(monthlength <=1)
            {
                monthstring = "0" + monthstring;
            }
        document.location.href ="<?php $_SERVER['PHP_SELF'];?>?month="+monthstring+"&year="+year;
        }

        function goNextMonth(month, year)
        {
            if(month == 12) 
            {
                ++year;
                month = 0;
            }
            ++month
            var monthstring= ""+month+"";
            var monthlength = monthstring.length;
            if(monthlength <=1)
            {
                monthstring = "0" + monthstring;
            }
            document.location.href ="<?php $_SERVER['PHP_SELF'];?>?month="+monthstring+"&year="+year;
        }
        </script>

PHP-创建日历

            if (isset($_GET['day']))
            {
                $day = $_GET['day'];
            } 
            else 
            {
                $day = date("j");
            }
            if(isset($_GET['month']))
            {
                $month = $_GET['month'];
            } 
            else 
            {
                $month = date("n");
            }
            if(isset($_GET['year']))
            {
                $year = $_GET['year'];
            }
            else
            {
                $year = date("Y");
            }
            $currentTimeStamp = strtotime( "$day-$month-$year");
            $monthName = date("F", $currentTimeStamp);
            $numDays = date("t", $currentTimeStamp);
            $counter = 0;
        ?>

        <table border='1'>
            <tr>
                <td><input style='width:50px;' type='button' value='<'name='previousbutton' onclick ="goLastMonth(<?php echo $month.",".$year?>)"></td>
                <td colspan='5'><?php echo $monthName.", ".$year; ?></td>
                <td><input style='width:50px;' type='button' value='>'name='nextbutton' onclick ="goNextMonth(<?php echo $month.",".$year?>)"></td>
            </tr>
            <tr>
                <td width='50px'>Poniedziałek</td>
                <td width='50px'>Wtorek</td>
                <td width='50px'>Środa</td>
                <td width='50px'>Czwartek</td>
                <td width='50px'>Piątek</td>
                <td width='50px'>Sobota</td>
                <td width='50px'>Niedziela</td>
            </tr>
            <?php
                echo "<tr>";
                for($i = 1; $i < $numDays+1; $i++, $counter++)
                {
                    $timeStamp = strtotime("$year-$month-$i");
                    if($i == 1) 
                    {
                        $firstDay = date("w", $timeStamp);
                        for($j = 0; $j < $firstDay-1; $j++, $counter++) 
                        {
                            echo "<td>&nbsp;</td>";
                        }
                    }
                    if($counter % 7 == 0) 
                    {
                        echo"</tr><tr>";
                    }
                    $monthstring = $month;
                    $monthlength = strlen($monthstring);
                    $daystring = $i;
                    $daylength = strlen($daystring);

                    echo "<td align='center' ";
                    echo "><a href='".$_SERVER['PHP_SELF']."?month=".$monthstring."&day=".$daystring."&year=".$year."'>".$i."</a></td>";
                }
                echo "</tr>";
            ?>
        </table>

日历运行良好，但当一个月的第一天是周日时，它会开始计算从周一开始的天数（例如2016年5月）。我该如何解决这个问题？

尝试以下代码

if($i == 1) 
{
    $firstDay = date("w", $timeStamp) - 1;
    if ($firstDay < 0)
        $firstDay = 6;
    // Now monday is 0, and sunday is 6
    for($j = 0; $j < $firstDay; $j++, $counter++) // remove the -1 in $firstDay-1
    {
        echo "<td>&nbsp;</td>";
    }
}

日历的第一列是星期一，最后一列是星期日。$firstDay = date("w", $timeStamp)返回0-6之间的数字，其中0表示周日，6表示周六。所以我把它改成0是星期一，6是星期天。

所以现在循环for($j = 0; $j < $firstDay; $j++, $counter++)如果是星期一，那么由于这是第一列，您不希望循环运行。周一，$firstDay为0，因此循环不会运行。如果星期二，则$firstDay为1，循环运行一次以腾出星期一的空空间。