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php生成验证码

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2016-06-13 09:58:44778browse

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session_start();


header("content-type:image/png");设置生成图片的格式这里为png


$width=40;//宽度


$height=25;//高度


$color="#ffffff";//色彩


$num=rand(1000,9999);//生成随机数4位


$_SESSION['ver']=$num;保存到session以前验证


$img=imagecreate($width,$height);//使用imagecreate创建图片


$bg1=imagecolorallocate($img,rand(0,100),rand(0,250),rand(0,255));//图片色采


$bg2=imagecolorallocate($img,rand(0,205),rand(0,250),rand(0,245));


//imageline($img,40,20,40,40,$color);


//imagesetpixel($img,44,44,$color);


imagestring($img,7,4,7,$num,$bg2);//增加杂点


imagepng($img);//生成图片


imagedestroy($img);//销毁


?>

这个是很简单的,所以就不详细的讲说了.

 

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