PHP面向对象简易验证码类

<?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。若有错误请指出。

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