一漂亮的PHP图片验证码实例_php实例
一、显示效果
二、代码如下
* @Author fy
*/
$imgwidth =100; //图片宽度
$imgheight =40; //图片高度
$codelen =4; //验证码长度
$fontsize =20; //字体大小
$charset = 'abcdefghkmnprstuvwxyzABCDEFGHKMNPRSTUVWXYZ23456789';
$font = 'Fonts/segoesc.ttf';
$im=imagecreatetruecolor($imgwidth,$imgheight);
$while=imageColorAllocate($im,255,255,255);
imagefill($im,0,0,$while); //填充图像
//取得字符串
$authstr='';
$_len = strlen($charset)-1;
for ($i=0;$i $authstr .= $charset[mt_rand(0,$_len)];
}
session_start();
$_SESSION['scode']=strtolower($authstr);//全部转为小写,主要是为了不区分大小写
//随机画点,已经改为划星星了
for ($i=0;$i $randcolor=imageColorallocate($im,mt_rand(200,255),mt_rand(200,255),mt_rand(200,255));
imagestring($im,mt_rand(1,5), mt_rand(0,$imgwidth),mt_rand(0,$imgheight), '*',$randcolor);
//imagesetpixel($im,mt_rand(0,$imgwidth),mt_rand(0,$imgheight),$randcolor);
}
//随机画线,线条数量=字符数量(随便)
for($i=0;$i{
$randcolor=imagecolorallocate($im,mt_rand(0,255),mt_rand(0,255),mt_rand(0,255));
imageline($im,0,mt_rand(0,$imgheight),$imgwidth,mt_rand(0,$imgheight),$randcolor);
}
$_x=intval($imgwidth/$codelen); //计算字符距离 $randcolor=imagecolorallocate($im,mt_rand(0,150),mt_rand(0,150),mt_rand(0,150)); } //生成图像
$_y=intval($imgheight*0.7); //字符显示在图片70%的位置
for($i=0;$i
//imagestring($im,5,$j,5,$imgstr[$i],$color3);
// imagettftext ( resource $image , float $size , float $angle , int $x , int $y , int $color , string $fontfile , string $text )
imagettftext($im,$fontsize,mt_rand(-30,30),$i*$_x+3,$_y,$randcolor,$font,$authstr[$i]);
header("content-type:image/PNG");
imagePNG($im);
imageDestroy($im);

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