简单的PHP日历算法

下面是一个简单的php日历算法，希望对大家有所帮助

 if (function_exists(&＃39;date_default_timezone_set&＃39;)) {  
     date_default_timezone_set(&＃39;Asia/Chongqing&＃39;);  
 }  
 $date = isset($_GET[&＃39;date&＃39;]) ? $_GET[&＃39;date&＃39;] : date(&＃39;Y-m-d&＃39;);  
 $date = getdate(strtotime($date));  
 $end = getdate(mktime(0, 0, 0, $date[&＃39;mon&＃39;] + 1, 1, $date[&＃39;year&＃39;]) - 1); 
 $start = getdate(mktime(0, 0, 0, $date[&＃39;mon&＃39;], 1, $date[&＃39;year&＃39;]));  
 $pre = date(&＃39;Y-m-d&＃39;, $start[0] - 1);  
 $next = date(&＃39;Y-m-d&＃39;, $end[0] + 86400);  
 $html = &＃39;

&＃39;;  
 $html .= &＃39;&＃39;;  
 $html .= &＃39;&＃39;;  
 $html .= &＃39;&＃39;;  
 $html .= &＃39;&＃39;;  
 $html .= &＃39;&＃39;;  
 $arr_tpl = array(0 => &＃39;&＃39;, 1 => &＃39;&＃39;, 2 => &＃39;&＃39;, 3 => &＃39;&＃39;, 4 => &＃39;&＃39;, 5 => &＃39;&＃39;, 6 => &＃39;&＃39;); 
 $date_arr = array();  
 $j = 0;  
 for ($i = 0; $i <$end[&＃39;mday&＃39;]; $i++) {  
     if (!isset($date_arr[$j])) {  
         $date_arr[$j] = $arr_tpl;  
     }  
     $date_arr[$j][($i+$start[&＃39;wday&＃39;])%7] = $i+1;  
     if ($date_arr[$j][6]) {  
         $j++;  
     }  
 }  
 foreach ($date_arr as $value) {  
     $html .= &＃39;&＃39;;  
     foreach ($value as $v) {  
         if ($v) {  
             if ($v == $date[&＃39;mday&＃39;]) {  
                 $html .= &＃39;&＃39;;  
             } else {  
                 $html .= &＃39;&＃39;;  
             }  
         } else {  
             $html .= &＃39;&＃39;;  
         }  
     }  
     $html .= &＃39;&＃39;;  
 }  
 $html .= &＃39;

-	&＃39; . $date[&＃39;year&＃39;] . &＃39;;&＃39; . $date[&＃39;month&＃39;] . &＃39;					+
&＃39; . $v . &＃39;	&＃39; . $v . &＃39;

&＃39;;  
 echo $html;