如何将表格单元格分成多个部分？

Question

实际上我一直在设计日历，因为我希望每个日历单元格的日期都应该被分成第一节的携带日期和其他携带的单词，如（A，P，L）。

到目前为止我做了什么

<?php
/**
Calendar Page
**/
class Calendar {  

    /**
     * Constructor
     */
    public function __construct(){     
        $this->naviHref = htmlentities($_SERVER['PHP_SELF']);
    }

    /********************* PROPERTY ********************/  
    private $dayLabels = array("Mon","Tue","Wed","Thu","Fri","Sat","Sun");

    private $currentYear=0;

    private $currentMonth=0;

    private $currentDay=0;

    private $currentDate=null;

    private $daysInMonth=0;

    private $naviHref= null;

    /********************* PUBLIC **********************/  

    /**
    * print out the calendar
    */
    public function show() {
        $year  == null;

        $month == null;

        if(null==$year&&isset($_GET['year'])){

            $year = $_GET['year'];

        }else if(null==$year){

            $year = date("Y",time());  

        }          

        if(null==$month&&isset($_GET['month'])){

            $month = $_GET['month'];

        }else if(null==$month){

            $month = date("m",time());

        }                  

        $this->currentYear=$year;

        $this->currentMonth=$month;

        $this->daysInMonth=$this->_daysInMonth($month,$year);  

        $content='<div id="calendar">'.
                        '<div class="box">'.
                        $this->_createNavi().
                        '</div>'.
                        '<div class="box-content">'.
                                '<ul class="label">'.$this->_createLabels().'</ul>';   
                                $content.='<div class="clear"></div>';     
                                $content.='<ul class="dates">';    

                                $weeksInMonth = $this->_weeksInMonth($month,$year);
                                // Create weeks in a month
                                for( $i=0; $i<$weeksInMonth; $i++ ){

                                    //Create days in a week
                                    for($j=1;$j<=7;$j++){
                                        $content.=$this->_showDay($i*7+$j);
                                    }
                                }

                                $content.='</ul>';

                                $content.='<div class="clear"></div>';     

                        $content.='</div>';

        $content.='</div>';
        return $content;   
    }

    /********************* PRIVATE **********************/ 
    /**
    * create the li element for ul
    */
    private function _showDay($cellNumber){

        if($this->currentDay==0){

            $firstDayOfTheWeek = date('N',strtotime($this->currentYear.'-'.$this->currentMonth.'-01'));

            if(intval($cellNumber) == intval($firstDayOfTheWeek)){

                $this->currentDay=1;

            }
        }

        if( ($this->currentDay!=0)&&($this->currentDay<=$this->daysInMonth) ){

            $this->currentDate = date('Y-m-d',strtotime($this->currentYear.'-'.$this->currentMonth.'-'.($this->currentDay)));

            $cellContent = $this->currentDay;

            $this->currentDay++;   

        }else{

            $this->currentDate =null;

            $cellContent=null;
        }


        return '<li id="li-'.$this->currentDate.'" class="'.($cellNumber%7==1?' start ':($cellNumber%7==0?' end ':' ')).
                ($cellContent==null?'mask':'').'">'.$cellContent.'</li>';
    }

    /**
    * create navigation
    */
    private function _createNavi(){

        $nextMonth = $this->currentMonth==12?1:intval($this->currentMonth)+1;

        $nextYear = $this->currentMonth==12?intval($this->currentYear)+1:$this->currentYear;

        $preMonth = $this->currentMonth==1?12:intval($this->currentMonth)-1;

        $preYear = $this->currentMonth==1?intval($this->currentYear)-1:$this->currentYear;

        return
            '<div class="header">'.
                '<a class="prev" href="'.$this->naviHref.'?month='.sprintf('%02d',$preMonth).'&year='.$preYear.'">Prev</a>'.
                    '<span class="title">'.date('Y M',strtotime($this->currentYear.'-'.$this->currentMonth.'-1')).'</span>'.
                '<a class="next" href="'.$this->naviHref.'?month='.sprintf("%02d", $nextMonth).'&year='.$nextYear.'">Next</a>'.
            '</div>';
    }

    /**
    * create calendar week labels
    */
    private function _createLabels(){  

        $content='';

        foreach($this->dayLabels as $index=>$label){

            $content.='<li class="'.($label==6?'end title':'start title').' title">'.$label.'</li>';

        }

        return $content;
    }



    /**
    * calculate number of weeks in a particular month
    */
    private function _weeksInMonth($month=null,$year=null){

        if( null==($year) ) {
            $year =  date("Y",time()); 
        }

        if(null==($month)) {
            $month = date("m",time());
        }

        // find number of days in this month
        $daysInMonths = $this->_daysInMonth($month,$year);

        $numOfweeks = ($daysInMonths%7==0?0:1) + intval($daysInMonths/7);

        $monthEndingDay= date('N',strtotime($year.'-'.$month.'-'.$daysInMonths));

        $monthStartDay = date('N',strtotime($year.'-'.$month.'-01'));

        if($monthEndingDay<$monthStartDay){

            $numOfweeks++;

        }

        return $numOfweeks;
    }

    /**
    * calculate number of days in a particular month
    */
    private function _daysInMonth($month=null,$year=null){

        if(null==($year))
            $year =  date("Y",time()); 

        if(null==($month))
            $month = date("m",time());

        return date('t',strtotime($year.'-'.$month.'-01'));
    }

}