php实现贪吃蛇小游戏

贪吃蛇游戏是经典手机游戏，既简单又耐玩。通过控制蛇头方向吃蛋，使得蛇变长，从而获得积分。在诺基亚时代，风靡整个手机界，今天我们来看看另类的，如何使用php来实现贪吃蛇小游戏
废话不多说，代码奉上：
control.php

<！DOCTYPE html><html><head><meta charset="utf-8"/></head><body> <a href="control.php?a=up">上<a/>       <?session_start（）; echo $_SESSION["count"];?>分<br/><a href="control.php?a=left">左<a/> <a href="control.php?a=right">右<a/><br/> <a href="control.php?a=down">下<a/><? switch（$_GET["a"]）{case "up";$_SESSION["con"]="up";break;case "down":$_SESSION["con"]="down";break;case "left":$_SESSION["con"]="left";break;case "right":$_SESSION["con"]="right";break;}?></body></html>

main.php

<！DOCTYPE html><html><head><meta charset="utf-9"/><meta http-equiv="refresh" content="0.5"/></head><frameset rows="95,*" border="1" noresize ><frame src="control.php" name="top"/><frame src="./tcs.php" name="menu"/></frameset></html>

tcs.php

<?phpsession_start（）;$_SESSION["ud"];$_SESSION["lr"];$im = imagecreatetruecolor（300,300）;$blue = imagecolorallocate（$im,0,0,255）;$red = imagecolorallocate（$im,255,0,0）;$c1 = imagecolorallocate（$im,200,200,200）;imagefill（$im,0,0,$c1）;if（！isset（$_SESSION["a"]）&&！isset（$_SESSION["b"]））{$_SESSION["a"] =rand（0,290）;$_SESSION["b"] =rand（0,290）;}if（isset（$_SESSION["a"]）&&isset（$_SESSION["b"]））{imagerectangle（$im,$_SESSION["a"],$_SESSION["b"],$_SESSION["a"]+10,$_SESSION["b"]+10,$red）; }if（abs（（$_SESSION["lr"]-$_SESSION["a"]））<=5&&abs（$_SESSION["ud"]-$_SESSION["b"]）<=5）{unset（$_SESSION["a"]）;unset（$_SESSION["b"]）;$_SESSION["count"]++;}switch（$_SESSION["con"]）{case "up";if（$_SESSION["ud"]>10）$_SESSION["ud"]-=10;else$_SESSION["ud"]=0;break;case "down":if（$_SESSION["ud"]<=280）$_SESSION["ud"]+=10;else$_SESSION["ud"]=290;break;case "left":if（$_SESSION["lr"]>10）$_SESSION["lr"]-=10;else$_SESSION["lr"]=0;break;case "right":if（$_SESSION["lr"]<=280）$_SESSION["lr"]+=10;else$_SESSION["lr"]=290;break;}for（$i=0;$i<=$_SESSION["count"];$i++）{switch（$_SESSION["con"]）{case "up":$_SESSION["udnext"] = $_SESSION["ud"]+10*$i;imagerectangle（$im,$_SESSION["lr"],$_SESSION["udnext"],$_SESSION["lr"]+10,$_SESSION["udnext"]+10,$blue）;// imagerectangle（$im,$_SESSION["lr"],$_SESSION["udtime"][time（）-$i],$_SESSION["lr"]+10,$_SESSION["udtime"][time（）-$i]+10,$blue）;break;case "down":$_SESSION["udnext"] = $_SESSION["ud"]-10*$i;imagerectangle（$im,$_SESSION["lr"],$_SESSION["udnext"],$_SESSION["lr"]+10,$_SESSION["udnext"]+10,$blue）;// imagerectangle（$im,$_SESSION["lr"],$_SESSION["udtime"][time（）+$i],$_SESSION["lr"]+10,$_SESSION["udtime"][time（）+$i]+10,$blue）;break;case "left":$_SESSION["lrnext"] = $_SESSION["lr"]+10*$i;imagerectangle（$im,$_SESSION["lrnext"],$_SESSION["ud"],$_SESSION["lrnext"]+10,$_SESSION["ud"]+10,$blue）;// imagerectangle（$im,$_SESSION["lrtime"][time（）-$i],$_SESSION["ud"],$_SESSION["lrtime"][time（）-$i]+10,$_SESSION["ud"]+10,$blue）;break;case "right":$_SESSION["lrnext"] = $_SESSION["lr"]-10*$i;imagerectangle（$im,$_SESSION["lrnext"],$_SESSION["ud"],$_SESSION["lrnext"]+10,$_SESSION["ud"]+10,$blue）;// imagerectangle（$im,$_SESSION["lrtime"][time（）+$i],$_SESSION["ud"],$_SESSION["lrtime"][time（）+$i]+10,$_SESSION["ud"]+10,$blue）;break;}//imagerectangle（$im,$_SESSION["lr"],$_SESSION["ud"],$_SESSION["lr"]+10,$_SESSION["ud"]+10,$blue）;}header（"Content-Type: image/jpeg"）;imagejpeg（$im）;imagedestroy（$im）;?>