javascript + php无效

Question

请原谅我糟糕的英语。

我想得到'本月有多少周'以及本周的循环次数。 但是我的代码不起作用。（当我在正确的数字中检查php值'$ weekcnt'时，但是没有开始循环。）请帮帮我，告诉我我的问题是什么。

<script>
    //How many week in this month
    var calcWeekCountInTargetYearAndMonthByDate = function(year, month, day) {
        var d = new Date(year, month, day);
        return Math.floor((d.getDate() - d.getDay() + 12) / 7);
    }
    //Get this month's last day
    var calcThisMonthEndDate =  function(year, month){
        var dt = new Date(year, month, 0).getDate();
        return dt;
    }
</script>  
<?php
    //How many week in this month
    $weekcnt = '<script type="text/javascript">document.write(calcWeekCountInTargetYearAndMonthByDate(2015, 6, calcThisMonthEndDate(2015,6)));</script>';
    echo "There is ".$weekcnt." Weeks <br>";
    //number of loop of the week
    for($tablecnt = 0; $tablecnt < $weekcnt; $tablecnt++)
    {
        echo "NOW = ".$tablecnt;
        //Test print
    }
?>

结果（谷歌浏览器）

There is 5 Weeks 

Answer 1

你不能这样做...... PHP在服务器端执行，因为只在客户端评估javascript。

你可以单独使用javacript，或者只使用PHP

var calcWeekCountInTargetYearAndMonthByDate = function (year, month, day) {
    var d = new Date(year, month, day);
    return Math.floor((d.getDate() - d.getDay() + 12) / 7);
}
//Get this month's last day
var calcThisMonthEndDate = function (year, month) {
    var dt = new Date(year, month, 0).getDate();
    return dt;
}
var num = calcWeekCountInTargetYearAndMonthByDate(2015, 6, calcThisMonthEndDate(2015, 6));

var text = 'There is ' + num + ' Weeks <br>';
for (var i = 1; i <= num; i++) {
    text += 'NOW = ' + i + '<br />';
}
document.write(text);