javascript + php不起作用

Question

请原谅我糟糕的英语。

我想得到'本月有多少周'以及那周的循环数。 （当我检查php值'$ weekcnt'的正确数字，但不启动循环。）请帮助我，并告诉我什么是我的问题。

<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

你不能做到这一点... PHP在服务器一侧的JavaScript是只在客户端执行评估。

可以，或者只是用PHP

单独做使用javacript相同

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);