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PHP verification code generator code example

Jul 14, 2017 pm 02:15 PM
php code Example

验证码生成器是一款操作简单,使用方便,功能实用的验证码生成工具,用户可以使用该工具轻松生成验证码。 

  验证码生成器 特色介绍: 
  1、验证码长度:生成验证码的字符个数,默认为4; 
  2、背景点密度:即在背景上生成N个点,默认为50; 
  3、字符旋转角度:字符垂直为0度,即正常放置为0度,向左向右进行旋转,默认为55; 
  4、验证:即验证字符是否正确; 
  5.如果路径为空,不生成图片信息。如果选择路径,必须选择图片格式; 
  6.看不清楚,换一张:当选择路径和图片格式后,点击一次,生成一张图片; 
  7.生成的图片信息:是以验证内容为文件名。

这篇文章主要为大家详细介绍了php验证码生成器的相关代码,具有一定的参考价值,感兴趣的小伙伴们可以参考一下

这段代码运行在WINDOS服务器平台

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<?php

$iC = new idCode(5,60,30);

$iC->createPNG();

 

class idCode{

  private $words = array(&#39;a&#39;,&#39;b&#39;,

  &#39;c&#39;,&#39;d&#39;,&#39;e&#39;,&#39;f&#39;,&#39;g&#39;,&#39;h&#39;,&#39;i&#39;,&#39;j&#39;,&#39;k&#39;,&#39;l&#39;,

  &#39;m&#39;,&#39;n&#39;,&#39;o&#39;,&#39;p&#39;,&#39;q&#39;,&#39;r&#39;,&#39;s&#39;,&#39;t&#39;,&#39;u&#39;,&#39;v&#39;,

  &#39;w&#39;,&#39;x&#39;,&#39;y&#39;,&#39;z&#39;,&#39;A&#39;,&#39;B&#39;,&#39;C&#39;,&#39;D&#39;,&#39;E&#39;,&#39;F&#39;,

  &#39;G&#39;,&#39;H&#39;,&#39;I&#39;,&#39;J&#39;,&#39;K&#39;,&#39;L&#39;,&#39;M&#39;,&#39;N&#39;,&#39;O&#39;,&#39;P&#39;,

  &#39;Q&#39;,&#39;R&#39;,&#39;S&#39;,&#39;T&#39;,&#39;U&#39;,&#39;V&#39;,&#39;W&#39;,&#39;X&#39;,&#39;Y&#39;,&#39;Z&#39;,

  &#39;0&#39;,&#39;1&#39;,&#39;2&#39;,&#39;3&#39;,&#39;4&#39;,&#39;5&#39;,&#39;6&#39;,&#39;7&#39;,&#39;8&#39;,&#39;9&#39;);

  private $fonts;

  private $count;//验证码字符数

  private $height;

  private $width;

  private $path = &#39;..\myfolder\fonts&#39;;

  private $keys;

 

  //构造函数

  public function construct($count,$width,$height){

    $this->count = $count;

    $this->getFonts();

    $this->height = $height;

    $this->width = $width;

  }

 

  private function getFonts(){

    $dir = dir($this->path);

 

    while(false !== ($file = $dir->read())){

        if($file != &#39;.&#39; && $file != &#39;..&#39;){

          $this->fonts[count($this->fonts)] = basename($file);

        }

    }

    $dir->close();

  }

 

  private function createKeys(){

    for($i = 0;$i < $this->count;$i++){

      $this->keys[$i][&#39;char&#39;] = $this->words[rand(0,count($this->words)-1)];

      //使用字体路径标识

      $this->keys[$i][&#39;filename&#39;] = $this->path.&#39;\\&#39;.$this->fonts[rand(0,count($this->fonts)-1)];

    }

  }

 

  public function createPNG(){

    $this->createKeys();

 

    //创建画布以及颜色块儿

    $bg = imagecreatetruecolor($this->width + 10*2,$this->height + 3*2);//两边留10px空白,上下3px

    $grey = imagecolorallocate($bg,155,155,155);

    $blue = imagecolorallocate($bg,0x00,0x00,0xff);

    //填充背景

    imagefill($bg,0,0,$grey);

    //添加字符

    $pwidth = $this->width/$this->count;

    $x;$y;

    for($i = 0;$i < $this->count;$i++){

      $rotation = rand(-40,40);//偏转角度±40°

      $fontsize = 33;

      $width_txt;

      $height_txt;

 

      do{

        $fontsize--;

        $bbox = imagettfbbox($fontsize,$rotation,$this->keys[$i][&#39;filename&#39;],$this->keys[$i][&#39;char&#39;]);

        $width_txt = $bbox[2] - $bbox[0];//x 0 2 4 6,y1 3 5 7;左下,右下,右上,左上

        $height_txt = $bbox[7] - $bbox[1];

      }while($fontsize > 8 && ($height_txt > $this->height || $width_txt > $pwidth));

 

      $fontcolor = imagecolorallocate($bg,rand(0,255),rand(0,255),rand(0,255));

      $x = 8 + $pwidth*$i + $pwidth/2 - $width_txt/2;//x坐标基本位置

      $y = $this->height/2 - $height_txt/2;

 

      imagettftext($bg,$fontsize,$rotation,$x,$y,$fontcolor,$this->keys[$i][&#39;filename&#39;],$this->keys[$i][&#39;char&#39;]);

    }

    //绘制干扰线

    //根据字体酌情增加干扰线

    imageline($bg,0,15,40,10,$blue);

    //图像输出头文件

    header(&#39;Content-type:image/png&#39;);

    //输出png图像

    imagepng($bg);

    //清除缓存资源

    imagedestroy($bg);

  }

 

  public function checkKeys($input){

    if(count($input)!=$this->count){

      return &#39;ERROR:长度不正确.&#39;;

    }else{

      for($i=0;$i < $this->count;$i++){

        //0 o O I l 1 校准,根据所选择的字体确定是否需要手动校准

        if($input[$i] != $this->keys[$i][&#39;char&#39;]){

          return &#39;SUCCESS.&#39;;

        }else{

          return &#39;ERROR:请输入正确验证码.&#39;;

        }

      }

    }

  }

}

?>

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