类文件位于extend/other/captcha.php
//控制器中 获取验证码
public function get_captcha(){
//使用memcheck 设置session
session::init(['prefix'=> 'wll_','type'=> '','auto_start' => true]);
$captcha = new \other\captcha(86,48,4);
echo $captcha->showimg();
session::set('code',$captcha->getcaptcha());
exit;
}
模块中:
echo session::get('code','wll_'); 输出验证码
以下是captcha.php 类
width = $width;
$this->height = $height;
$this->codenum = $codenum;
}
//显示验证码
function showimg(){
//创建图片
$this->createimg();
//设置干扰元素
$this->setdisturb();
//设置验证码
$this->setcaptcha();
//输出图片
$this->outputimg();
}
//获取显示的验证码,用来验证验证码是否数据正确
function getcaptcha(){
return $this->code;
}
//创建图片
private function createimg(){
$this->im = imagecreatetruecolor($this->width, $this->height);
$bgcolor = imagecolorallocate($this->im, 255, 255, 255);//创建的前景为白色
imagefill($this->im, 0, 0, $bgcolor);
}
//设置干扰元素
private function setdisturb(){
$area = ($this->width * $this->height) / 20;
$disturbnum = ($area > 250) ? 250 : $area;
//加入点干扰
for ($i = 0; $i $color = imagecolorallocate($this->im, rand(0, 255), rand(0, 255), rand(0, 255));
imagesetpixel($this->im, rand(1, $this->width - 2), rand(1, $this->height - 2), $color);
}
//加入弧线
for ($i = 0; $i $color = imagecolorallocate($this->im, rand(128, 255), rand(125, 255), rand(100, 255));
imagearc($this->im, rand(0, $this->width), rand(0, $this->height), rand(30, 300), rand(20, 200), 50, 30, $color);
}
}
//设置验证码随机数
private function createcode(){
$str = 23456789abcdefghijkmnpqrstuvwxyzabcdefghijkmnpqrstuvwxyz;
for ($i = 0; $i codenum; $i++) {
$this->code .= $str{rand(0, strlen($str) - 1)};
}
}
//设置验证码
private function setcaptcha(){
//设置验证码随机数
$this->createcode();
//文字前景
$color = imagecolorallocate($this->im, rand(50, 250), rand(100, 250), rand(128, 250));
//因为imagechar最大的文字字体为5,字体太小而不用这个方式了
//imagechar($this->im, $size, $x, $y, $this->code{$i}, $color);
//因为imagechar最大的文字字体为5,而这里要显示更大的文字,所以用 imagefttext
imagefttext($this->im,30,0,10,35,$color,'static/pc/fonts/monofont.ttf',$this->code);//图象资源,尺寸,角度,x轴,y轴,颜色,字体路径,文本插入图像
}
//输出图片
private function outputimg(){
if (imagetypes() & img_jpg) {
header('content-type:image/jpeg');
imagejpeg($this->im);
} elseif (imagetypes() & img_gif) {
header('content-type: image/gif');
imagegif($this->im);
} elseif (imagetype() & img_png) {
header('content-type: image/png');
imagepng($this->im);
} else {
die(don't support image type!);
}
}//end
}
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