PHP面向对象简易验证码类

PHP简单验证码类，可直接使用，替换字体路径

<?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。

更多相关问题请访问PHP中文网：PHP视频教程

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