php gd 生成日历图

 <?php

 //如果您提交了时间则显示您提交年月的日历，否则显示当前月份日历
 if (isset($_GET['month']) && isset($_GET['year']))
 {
     $month = $_GET['month'];
     $year = $_GET['year'];
 }
 else
 {
     $month = date ('m');
     $year = date ('Y');
 }
 $weekid = date ('w',mktime(0,0,0,$month,1,$year));//某年某月第一天是星期几。0-7分别代表星期日-星期六
 $countdays = date('t',mktime(0,0,0,$month,1,$year));//某年某个月的天数
 //获取上个月的天数
 $prevMonth = $month - 1;
 $prevYear = $year;
 if($prevMonth == 0){
     $prevMonth = 12;
     $prevYear = $year - 1;
 }
 $prevMonthDays = date('t',mktime(0,0,0,$prevMonth,1,$prevYear));//某年某个月的上个月的天数
 //echo $prevMonthDays."<br/>";
 //echo $prevMonth."<br/>";
 $countdays = date('t',mktime(0,0,0,$month,1,$year));//某年某个月的天数
 $arr_days = array ();//数组$arr_days代表某个月的每一天
 //echo $weekid."<br/>";
 //echo $countdays."<br/>";
 //print_r($arr_days);
 $tempweekid = $weekid-1; //用于计算上个月前面的天数
 //初始化数组$arr_days
 for ($i = 0; $i <= 35; $i++)
 {
     if($tempweekid >=0){
         $arr_days[$i] = $prevMonthDays - $tempweekid;
         $tempweekid--;
     }else{
         $arr_days[$i] = "";
     }

 }

 //给$arr_days数组赋值
 for ($i = $weekid, $j = 1; $j <= $countdays; $i++, $j++)
 {
     $arr_days[$i] = $j;
 }

 header("Content-type: image/png");
 $im = @imagecreate(300, 185)
     or die("Cannot Initialize new GD image stream");
 $background_color = imagecolorallocate($im, 255, 255, 255);

 // Create some colors
 $white = imagecolorallocate($im, 255, 255, 255);
 $grey = imagecolorallocate($im, 128, 128, 128);
 $black = imagecolorallocate($im, 0, 0, 0);
 $red = imagecolorallocate($im, 255, 37, 37);
 $color2 = imagecolorallocatealpha($im,0,0,0,0);

 $alphagray = imagecolorallocatealpha($im,205,206,206,0);
 $alphared = imagecolorallocatealpha($im,255,206,206,0);

 $font = './gillsans.ttf';
 $text = "SU";

 $titleArray = array("SUN","MON","TUE","WED","THU","FRI","SAT");
 $font_x = 20;
 $font_y = 20;
 foreach($titleArray as $key=>$value){
 // Add some shadow to the text
     imagettftext($im, 12, 0, $font_x, $font_y, $color2, $font, $value);
     $font_x +=40;
 }

 $font_x = 20;
 $font_y = 45;

     //表格输出
 for ($i = 0; $i <= 35; $i++)
 {
     $row = $arr_days[$i];
     $tempFontx = $font_x;
     if($row < 10){
         $tempFontx +=5;
     }

     if ($i % 7 == 0)
     {

         if($i < 7 && $row > 7){
             imagettftext($im, 12, 0, $tempFontx, $font_y, $alphared, $font, $row);
         }else{
             imagettftext($im, 12, 0, $tempFontx, $font_y, $red, $font, $row);
         }

         $font_x +=40;
     }else{
         if($i < 7 && $row > 7){
             imagettftext($im, 12, 0, $tempFontx, $font_y, $alphagray, $font, $row);
         }else{
             imagettftext($im, 12, 0, $tempFontx, $font_y, $color2, $font, $row);
         }    

         $font_x +=40;
     }

     if (($i + 1) % 7 == 0)
     {
         $font_x = 20;
         $font_y += 25;
     }
 }

 // Add the text
 imagepng($im,"./".$year.$month.".png");
 //imagepng($im);
 imagedestroy($im);

使用的字体Font: http://pan.baidu.com/s/1jGBzrM2

最终效果:

参考文章:用php实现的一个简单万年历