Class sharing of PHP verification code generated by individuals

This verification code class can be used directly, and you can also refer to it!

Where the class member codestr is the generated verification code string:

<?php
/**
 *  Verification code 
 */
class Code{
 
  // 1.  Define individual members   There are width, height, canvas, number of words, type and painting type 
   
  private $width; // Width 
  private $height; // Height 
  private $num; // Verification code words 
  private $imgType; // Generate picture type 
  private $Type; // String type  1,2,3 3 Options  1  Pure number  2  Pure lowercase letters  3  Mix of upper and lower case numbers 
  private $hb; // Canvas 
  public $codestr; //  Verification code string 
 
  public function __construct($height=20,$num=4,$imgType="jpeg",$Type=1){
    $this->width = $num*20;
    $this->height = $height;
    $this->num = $num;
    $this->imgType = $imgType;  
    $this->Type = $Type; 
    $this->codestr = $this->codestr();
    $this->zuhe();
  }
 
  // 2.  Define a random string fetch function 
  private function codestr(){
    switch($this->Type){
     
      case 1:   //  Type is 1  Get 1-9 Random number 
        $str = implode("",array_rand(range(0,9),$this->num));
        break;
      case 2:   //  Type is 2  Get a-z Random lowercase letters 
        $str = implode("",array_rand(array_flip(range(a,z)),$this->num));
        break;
      case 3:   //  Type is 3  Get a number , Lowercase letter , Capital letters   Mixing 
        for($i=0;$i<$this->num;$i++){
          $m = rand(0,2);
          switch($m){
            case 0:
              $o = rand(48,57);
              break;
            case 1:
              $o = rand(65,90);
              break;
            case 2:
              $o = rand(97,122);
              break; 
          }
          $str .= sprintf("%c",$o);
        }
        break;     
    }
 
     
    return $str;  
  }
 
 
  // 3.  Initialize canvas image resources 
  private function Hb(){
    $this->hb = imagecreatetruecolor($this->width,$this->height); 
  }
 
  // 4.  Generate background color 
  private function Bg(){
    return imagecolorallocate($this->hb,rand(130,250),rand(130,250),rand(130,250)); 
  }
 
  // 5.  Generate font color 
  private function Font(){
    return imagecolorallocate($this->hb,rand(0,100),rand(0,100),rand(0,100));  
  }
 
  // 6.  Fill the background color 
  private function BgColor(){
    imagefilledrectangle($this->hb,0,0,$this->width,$this->height,$this->Bg()); 
  }
 
  // 7.  Interference point 
  private function ganrao(){
    $sum=floor(($this->width)*($this->height)/3);
    for($i=0;$i<$sum;$i++){
      imagesetpixel($this->hb,rand(0,$this->width),rand(0,$this->height),$this->Bg());  
    }
  }
 
  // 8.  Random line   Arc 
  private function huxian(){
    for($i=0;$i<$this->num;$i++){
      imageArc($this->hb,rand(0,$this->width),rand(0,$this->height),rand(0,$this->width),rand(0,$this->height),rand(0,360),rand(0,360),$this->Bg());    
    }  
  }
 
  // 9.  Writing 
  private function xiezi(){
    for($i=0;$i<$this->num;$i++){
      $x=ceil($this->width/$this->num)*$i; 
      $y=rand(1,$this->height-15);
      imagechar($this->hb,5,$x+4,$y,$this->codestr[$i],$this->Font());
    }  
  }
 
  // 10.  Output 
  private function OutImg(){
    $shuchu="image".$this->imgType; 
    $header="Content-type:image/".$this->imgType;
    if(function_exists($shuchu)){
      header($header);
      $shuchu($this->hb); 
    }else{
      exit("GD Library does not have such an image "); 
    }
  }
 
  // 11.  Assemble 
  private function zuhe(){
    $this->Hb();
    $this->BgColor();
    $this->ganrao();
    $this->huxian();
    $this->xiezi();
    $this->OutImg(); 
  }  
 
  public function getCodeStr(){
    return $this->codestr;    
  }
}
?>