IP signature probe_PHP tutorial

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PHP代码:--------------------------------------------------------------------------------
/*****************************************************
Canfeng made an IP signature probe---stormor@163.com
If there is any incorrect display, please send me an email for correction!
**************************************************** ******/
Header("Content-type: image/png");

if(getenv("HTTP_CLIENT_IP")) {
$ip = getenv("HTTP_CLIENT_IP");
$ip_agent = getenv("REMOTE_ADDR");
} elseif(getenv("HTTP_X_FORWARDED_FOR")) {
$ip_real = getenv("HTTP_X_FORWARDED_FOR");
$ip_agent = getenv("REMOTE_ADDR");
} else {
$ip_real = getenv("REMOTE_ADDR");
$ip_agent = "";
}

if(!$ip_agent){
$wenzi="IP:";
$ip_count=strlen($ip_real);
$left=22;
$width=$ip_count*6+$left+5;
$height=14;
$picture=Imagecreate($width,$height);
$bgcolor=ImageColorAllocate($picture,225,250,225);
$bordercolor=ImageColorAllocate($picture,0,0,0);
$fontcolor=ImageColorAllocate($picture,0,0,0);
Imageline($picture,0,0,$width-1,0,$bordercolor);
Imageline($picture,0,0,0,$height-1,$bordercolor);
Imageline($picture,$width-1,$height-1,$width-1,0,$bordercolor);
Imageline($picture,$width-1,$height-1,0,$height-1,$bordercolor);
Imagestring($picture,2,2,0,$wenzi,$fontcolor);
Imagestring($picture,2,$left+2,0,$ip_real,$fontcolor);
Imagepng($picture);
ImageDestroy($picture);
}else{
$wenzi1="IP1:";
$wenzi2="IP2:";
$ip_count1=strlen($ip_real);
$ip_count2=strlen($ip_agent);
$left=26;
if($ip_count1>=$ip_count2){$width=$ip_count1*6+$left+5;}else{$width=$ip_count2*6+$left+5;}
$height=29;
$middle=$height/2+1;
$picture=Imagecreate($width,$height);
$bgcolor=ImageColorAllocate($picture,225,250,225);
$bordercolor=ImageColorAllocate($picture,0,0,0);
$fontcolor=ImageColorAllocate($picture,0,0,0);
Imageline($picture,0,0,$width-1,0,$bordercolor);
Imageline($picture,0,0,0,$height-1,$bordercolor);
Imageline($picture,$width-1,$height-1,$width-1,0,$bordercolor);
Imageline($picture,$width-1,$height-1,0,$height-1,$bordercolor);
Imageline($picture,$width-1,$middle-1,0,$middle-1,$bordercolor);
Imagestring($picture,2,2,0,$wenzi1,$fontcolor);
Imagestring($picture,2,$left+2,0,$ip_real,$fontcolor);
Imagestring($picture,2,2,$middle,$wenzi2,$fontcolor);
Imagestring($picture,2,$left+2,$middle,$ip_agent,$fontcolor);
Imagepng($picture);
ImageDestroy($picture);
}

?>

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