Home  >  Article  >  Backend Development  >  PHP verification code generator code example

PHP verification code generator code example

怪我咯
怪我咯Original
2017-07-14 14:15:381627browse

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

<?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;;
        }
      }
    }
  }
}
?>

The above is the detailed content of PHP verification code generator code example. For more information, please follow other related articles on the PHP Chinese website!

Statement:
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn