PHP面向对象简易验证码类

PHP简易验证码类

 <?php

 class authCode
 {
     private static $instance = null;     #实例对象
     private $width = 120;                #图片宽度
     private $height = 40;                #图片高度
     private $font = 'font/elephant.ttf'; #字体文件路径
     private $fontSize = 14;              #字体大小
     private $strLen = 6;                 #字符个数
     private $auth_code_str = null;       #验证码结果
     private $imgResult = null;           #图片资源

     #入口文件 静态方法调用 实例化对象 可用 对象方法调用
     public static function img()
     {
         if (!(self::$instance instanceof self)) {
             self::$instance = new self();
         }
         return self::$instance;
     }

      #随机颜色
     private function randomColor($img = null, $min = 0, $max = 255)
     {
         $rgb = [];
         for ($i = 1; $i <= 3; $i++) {
             $rgb[] = str_pad(rand($min, $max), 3, 0, STR_PAD_LEFT);
         }
         return imagecolorallocate($img, $rgb[0], $rgb[1], $rgb[2]);
     }

     #随机字符串
     private function randomStr($num = 4)
     {
         if ($num > 0) {
             $string = array_merge(range('a', 'z'), range(0, 9), range('A', 'Z'), range(0, 9));
             for ($i = 1; $i <= $num; $i++) {
                 shuffle($string);
                 $this->auth_code_str .= array_pop($string);
             }
         }
         return $this;
     }

      #创建验证码
     public function createAuthCode(&$codeStr = false)
     {
         if (!$this->auth_code_str) {
             $this->randomStr($this->strLen);
         }

         if ($codeStr !== false && empty($codeStr)) {
             $codeStr = $this->auth_code_str;
         } else if (!empty($codeStr) && $codeStr !== false) {
             $this->auth_code_str = $codeStr;
         }

         $this->imgResult = imagecreatetruecolor($this->width, $this->height);

         $background = $this->randomColor($this->imgResult, 200);

         imagefilledrectangle($this->imgResult, 0, 0, $this->width, $this->height, $background);

         $y = ($this->height - $this->fontSize);

         $string = str_split($this->auth_code_str, 1);

         for ($i = 0; $i < count($string); $i++) {
             $frontColor = $this->randomColor($this->imgResult, 0, 200);
             imagefttext($this->imgResult, $this->fontSize, rand(0, 10), ($this->fontSize + 2) * $i + 10, $y, $frontColor, $this->font, $string[$i]);
         }
         return $this;
     }

     #生成线
     public function line($line = 3)
     {
         $line = $line ?: 3;
         for ($i = 1; $i <= $line; $i++) {
             $lineColor = $this->randomColor($this->imgResult, 0, 200);
             imageline($this->imgResult, rand(0, $this->width / 5), rand(5, $this->height - 5), rand($this->width / 1.3, $this->width), rand(5, $this->height - 5), $lineColor);
         }
         return $this;
     }

     #噪点
     public function pixel($num = 50){
         $num = $num ?: 3;
         for ($i = 1; $i <= $num; $i++) {
             $lineColor = $this->randomColor($this->imgResult, 0, 100);
             imagesetpixel($this->imgResult, rand(0, $this->width), rand(0, $this->height), $lineColor);
         }
         return $this;
     }

     #设置大小
     public function size($width = null, $height = null)
     {
         $this->width = $width ?: 120;
         $this->height = $height ?: 40;
         return $this;
     }

     #设置字体大小
     public function fontSize($fontsize = 14)
     {
         $this->fontSize = $fontsize ?: 14;
         return $this;
     }

     #设置字体
     public function font($file = null)
     {
         if (is_null($file) === true) {
             $this->font = 'font/elephant.ttf';
         } else {
             $this->font = $file;
         }
         return $this;
     }

     #设置长度
     public function strlen($num = null)
     {
         $this->strLen = $num ?: 6;
         return $this;
     }

     public function display()
     {
         ob_end_flush();
         header("content-type:image/jpeg");
         imagejpeg($this->imgResult, null, 100);
         imagedestroy($this->imgResult);
         exit;
     }
 }

 #简单调用方法
 authCode::img()->createAuthCode()->display();

 #指定字符串调用
 // $string = 'abc123';
 // authCode::img()->createAuthCode($string)->display();

 #设置图片大小、字数、字体大小
 // authCode::img()->strlen(8)->size(300,100)->fontSize(30)->createAuthCode()->display();

 #添加噪点
 // authCode::img()->createAuthCode()->line()->pixel()->display();

     ?>

以上便是关于验证码类的封装过程，可以直接使用。

链接：https://mp.weixin.qq.com/s/7RrGadoaN-If72N30LGEEw