Use PHP to generate verification codes with interference lines, interference points, and character tilt detailed codes

PHP is a class code for generating verification codes. This verification code class supports the generation of interference pixels such as interference points and interference lines, and can also tilt characters. In the class, you can define parameters such as the width, height, length, and tilt angle of the verification code, with detailed usage attached:

<?php    
    class class_authcode{    
        public  $authcode   = &#39;&#39;; //验证码    
        private $width      = &#39;&#39;; //验证码图片宽    
        private $height     = &#39;&#39;; //验证码图片高    
        private $len        = &#39;&#39;; //验证码长度    
        private $tilt       = array(-30,30);//验证码倾斜角度    
        private $font       = &#39;AlteHaasGroteskBold.ttf&#39;;//字体文件    
        private $str        = &#39;&#39;; //验证码基    
        private $im         = &#39;&#39;; //生成图片的句柄    
        //构造函数    
        function __construct($width=100,$heigh=30,$len=4) {    
            $this->width    = $width;    
            $this->height   = $heigh;    
            $this->len      = $len;    
            $this->str      = &#39;ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz&#39;;    
            $str_len = strlen($this->str)-1;    
            for ($i=0; $i<$len; $i++) {    
                $this->authcode .= $this->str[rand(0,$str_len)];    
            }    
        }    
        //生成验证码图片    
        private function imagecreate(){    
            $this->im = imagecreatetruecolor($this->width,$this->height);    
        }    
        //干扰颜色    
        private function ext_color() {    
            return imagecolorallocate($this->im,rand(50, 180),rand(50, 180),rand(50, 180));    
        }    
        //生成干扰点    
        private function ext_point() {    
            for ($i=0; $i<$this->width*2; $i++) {    
                imagesetpixel($this->im,rand(1,$this->width-1),rand(1,$this->height-1),$this->ext_color());    
            }    
        }
         //生成干扰线    
                private function ext_line() {    
                    for ($i=0; $i<$this->len; $i++) {    
                        $x1 = rand(1,$this->width-1);    
                        $y1 = rand(1,$this->height-1);    
                        $x2 = rand(1,$this->width-1);    
                        $y2 = rand(1,$this->height-1);    
                        imageline($this->im,$x1,$y1,$x2,$y2,$this->ext_color());    
                    }    
                }
                //把验证码写入图片（不能和$this->imgstrfloat()同时使用）    
                private function imgstr() {    
                    $old_x = 1;    
                    for ($i=0; $i<$this->len; $i++) {    
                        $fontsize = rand(2,5);      //字体大小    
                        $tmp_1 = $fontsize*2.5;    
                        $tmp_2 = $i>0  $tmp_1 : 0;    
                        $y = rand(1,$this->height/2);    
                        $x = rand($old_x+$tmp_2, ($i+1)*($this->width)/$this->len-$tmp_1);    
                        $old_x = $x;    
                        $color = imagecolorallocate($this->im,rand(200, 255),rand(200, 255),rand(200, 255));    
                        imagestring($this->im,$fontsize,$x,$y,$this->authcode[$i],$color);    
                    }    
                }
                //把验证码倾斜写入图片（注意这里不能和$this->imgstr()方法同时使用）    
                 private function imgstrfloat() {    
                    $old_x = 1;    
                    for ($i=0; $i<$this->len; $i++) {    
                        $fontfloat = rand($this->tilt[0],$this->tilt[1]);    
                        $fontsize = rand(10,15);        //字体大小    
                        $tmp_1 = $i>0  $fontsize : 0;    
                        $y = rand($fontsize+2, $this->height-2);    
                        $x = rand($old_x+$tmp_1+2, ($i+1)*($this->width)/$this->len-$fontsize-2);    
                        $old_x = $x;    
                        $color = imagecolorallocate($this->im, rand(200, 255), rand(200, 255), rand(200, 255));    
                        imagettftext($this->im, $fontsize, $fontfloat, $x, $y, $color, $this->font, $this->authcode[$i]);    
                    }    
                } 
                //输出验证码图片    
                function output() {    
                    $this->imagecreate();    
                    $this->imgstr();    
                    //$this->imgstrfloat();    
                    $this->ext_point();    
                    $this->ext_line();    
                    header(&#39;content-type:image/png&#39;);    
                    imagepng($this->im);    
                    imagedestroy($this->im);    
                }    
            }    
?>

Instructions for usage of this verification code:

$obj = new class_authcode();//实例化对象，并设置验证码图片的宽、高和验证码的长度    
$obj->$authcode; //获取验证码    
$obj->output(); //输出验证码图片

The above is the PHP generated verification Code class code, please point out any deficiencies.

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