//验证码类
class ValidateCode {
private $charset = 'abcdefghkmnprstuvwxyzABCDEFGHKMNPRSTUVWXYZ23456789';//随机因子
private $code;//验证码
private $codelen = 4;//验证码长度
private $width = 130;//宽度
private $height = 50;//高度
private $img;//图形资源句柄
private $font;//指定的字体
private $fontsize = 20;//指定字体大小
private $fontcolor;//指定字体颜色

//构造方法初始化
public function __construct()
{
$this->font = public_path() . '/fonts/Elephant.ttf';//注意字体路径要写对，否则显示不了图片
$this->createCode();
}
//生成随机码
private function createCode()
{
$_len = strlen($this->charset) - 1;
for ($i = 0;$i < $this->codelen;++$i) {
$this->code .= $this->charset[mt_rand(0,$_len)];
}
}
//生成背景
private function createBg()
{
$this->img = imagecreatetruecolor($this->width,$this->height);
$color = imagecolorallocate($this->img,mt_rand(157,255),255));
imagefilledrectangle($this->img,$this->height,$this->width,$color);
}
//生成文字
private function createFont()
{
$_x = $this->width / $this->codelen;
for ($i = 0;$i < $this->codelen;++$i) {
$this->fontcolor = imagecolorallocate($this->img,mt_rand(0,156),156));
imagettftext($this->img,$this->fontsize,mt_rand(-30,30),$_x $i + mt_rand(1,5),$this->height / 1.4,$this->fontcolor,$this->font,$this->code[$i]);
}
}
//生成线条、雪花
private function createLine()
{
//线条
for ($i = 0;$i < 6;++$i) {
$color = imagecolorallocate($this->img,156));
imageline($this->img,$this->width),$this->height),$color);
}
//雪花
for ($i = 0;$i < 100;++$i) {
$color = imagecolorallocate($this->img,mt_rand(200,255));
imagestring($this->img,mt_rand(1,'',$color);
}
}
//输出
private function outPut()
{
header('Content-type:image/png');
imagepng($this->img);
imagedestroy($this->img);
}
//对外生成
public function doimg()
{
$this->createBg();
$this->createLine();
$this->createFont();
$this->outPut();
}
//获取验证码
public function getCode()
{
return strtolower($this->code);
}
}