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
PHP;">
<Meta charset="utf-8"/>
PHP?a=up">上分
PHP?a=left">左PHP?a=right">右
PHP?a=down">下
PHP?a=left">左PHP?a=right">右
PHP?a=down">下
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;
}
?>
main.PHP
tcs.PHP
PHP;">
PHP
session_start();
$_SESSION['ud'];
$_SESSION['lr'];
$im = imagecreatetruecolor(300,300);
$blue = imagecolorallocate($im,255);
$red = imagecolorallocate($im,255,0);
$c1 = imagecolorallocate($im,200,200);
imagefill($im,$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['udtime'][time()-$i],$_SESSION['udtime'][time()-$i]+10,$blue);
break;
case "down":
$_SESSION['udnext'] = $_SESSION['ud']-10*$i;
imagerectangle($im,$_SESSION['udtime'][time()+$i],$_SESSION['udtime'][time()+$i]+10,$blue);
break;
case "left":
$_SESSION['lrnext'] = $_SESSION['lr']+10*$i;
imagerectangle($im,$_SESSION['lrnext'],$_SESSION['ud'],$_SESSION['lrnext']+10,$_SESSION['ud']+10,$_SESSION['lrtime'][time()-$i],$_SESSION['lrtime'][time()-$i]+10,$blue);
break;
case "right":
$_SESSION['lrnext'] = $_SESSION['lr']-10*$i;
imagerectangle($im,$_SESSION['lrtime'][time()+$i],$_SESSION['lrtime'][time()+$i]+10,$blue);
break;
}
//imagerectangle($im,$blue);
}
header("Content-Type: image/jpeg");
imagejpeg($im);
imagedestroy($im);
?>
