PHP验证码类

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[PHP] 纯文本查看 复制代码

<?php 
 
class verify{
 
    //随机因子
    private $text = 'abcdefghWddsdffgdWRFJKFJDFjjdfglkdfg883498Jhdsd9345345j340fg343o4j39d9t345j9dtej';
 
    //验证码句柄资源
    private $code;
 
    //验证码长度
    private $length = 4;
 
    //验证码字体大小
    private $size = 20;
 
    //生成图像的高度
    private $height = 30;
 
    //验证码字体
    private $font;
 
    //图像资源句柄
    private $image;
 
    /**
     *  构造方法初始化
     */
    public function __construct(){
        $this->font = './static/fonts/msyh.ttf';
    }
 
    /**
     *  生成随机码
     */
    private function createcode(){
        $textlength = strlen($this->text)-1;
        for($i=0; $i<$this->length; $i++){
            $this->code .= $this->text[rand(0,$textlength)];
        }
    }
 
    /**
     *  创建图像
     */
    private function createimg(){
        //创建画布
        $this->image = imagecreatetruecolor($this->size*$this->length, $this->height);
 
        //随机背景色
        $color = imagecolorallocate($this->image, rand(0,255), rand(100,255), 175);
 
        //创建矩形
        imagefilledrectangle($this->image, 0, $this->height, $this->size*$this->length, 0, $color);
    }
 
    /**
     *  生成文字
     */
 
    private function createtext(){
        for($i=0;$i<$this->length;$i++){
            $color = imagecolorallocate($this->image, 255, 255, 255);
            imagettftext($this->image, $this->size, 0, 2, 25, $color, $this->font, $this->code);
        }
 
        //设置字符间距
        //imagepsbbox($this->text, $this->font, $this->size);
    }
 
    /**
     *  生成干扰线 以及 $string字符
     */
    private function createline(){
        $string = '--';
        for($i=0; $i<1; $i++){
            $color = imagecolorallocate($this->image, rand(200,255), rand(200,255), rand(200,255));
            imageline($this->image, rand(1,$this->size*$this->length), rand(1,$this->height), rand(1,$this->size*$this->length), rand(1,$this->height), $color);
        }
        for($i=0; $i<10; $i++){
            $color = imagecolorallocate($this->image, rand(0,10), rand(50,150), rand(200,255));
            imagestring($this->image, 1, rand(0,$this->size*$this->length), rand(0,$this->height), $string, $color);
        }
    }
 
    /**
     *  输出图像
     */
    private function outimage(){
        header('content-type:image/png');
        imagepng($this->image);
        imagedestroy($this->image);
    }
 
    /**
     *  对外生成验证
     */
    public function doimage(){
        $this->createimg();
        $this->createcode();
        $this->createtext();
        $this->createline();
        $this->outimage();
    }
 
    //获取验证码  
    public function getverify() {  
        return strtolower($this->code);
    }
 
}
 
?>