Personal write PHP validation code generation class sharing _php instance

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

Where the class member Codestr is the generated authentication code string:

<?php/** * Verification Code/Class code{//1. Define members with wide, high, canvas, Word, type, 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 three options 1 pure digit 2 Pure Small Letter 3 Case number mixed private $HB; Canvas public $codestr;
    Validation code string Public function __construct ($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 ();
  $this->zuhe (); }//2. Define random fetch string function Private function codestr () {switch ($this->type) {Case 1://Type 1 gets 1-9 random number $str
        = Implode ("", Array_rand (range (0,9), $this->num));
      Break
        Case 2://Type 2 get a-Z random lowercase letter $str = Implode ("", Array_rand (Array_flip (range (a,z)), $this->num));
      Break
   Case 3://Type 3 get number, lowercase letter, uppercase mixed for ($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 $str; }//3. 
  Initialize Canvas image resource Private Function Hb () {$this-&GT;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 ($this->hb,rand (0,100), Rand (0,100), Rand (0,100)); }//6. Fill background color private function bgcolor () {Imagefilledrectangle ($this->hb,0,0, $this->width, $this->height, $this-& Gt 
  Bg ()); }//7. Noise Point Private Function Ganrao () {$sum =floor ($this->width) * ($this->height)/3); For ($i =0 $i < $sum $i + +) {Imagesetpixel ($this->hb,rand (0, $this->width), rand (0, $this->height), $this-  
    &GT;BG ()); }//8. Random line arcs Private Function Huxian () {for ($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-&GT;BG ()); }//9. 
      Write 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-&GT;HB); 
    }else{exit ("No such image in GD Library"); }//11.
Assemble private Function Zuhe () {    $this-&GT;HB ();
    $this->bgcolor ();
    $this->ganrao ();
    $this->huxian ();
    $this->xiezi (); 
  $this->outimg ();    
  The Public Function Getcodestr () {return $this->codestr; }}?>