Nice PHP verification code class

<?php//Verification Code Class class validatecode {private  $charset  =  ' abcdefghkmnprstuvwxyzABCDEFGHKMNPRSTUVWXYZ23456789 ';     //random factor      private  $code;                             //Verification Code      private  $codelen  = 4;                     //Verification Code length     private  $width  =  130;                     //width     private  $height  = 50;                     //height     private  $img;                                  //Graphics resource handle     private  $font ;                                 //the specified font      private  $fontsize  = 20;                 //Specify font size     private  $fontcolor;                          //Specifies font color     //constructor method initialization     public function __ Construct ()  {         $this->font = root_path. ' /font/elephant.ttf ';     }    //Generate random Code     private function createcode ()  {        $_len = strlen ($this->charset) -1;         for  ($i =0; $i < $this->codelen; $i + +)  {              $this->code .=  $this->charset[mt_ Rand (0,$_len)];        }    }     //Generate Background &NBSP;&NBSP;&NBSP;&NBSP;PRIVATE&NBSP;FUNCTION&NBSP;CREATEBG ()  {          $this->img = imagecreatetruecolor ($this->width,  $this->height);          $color  = imagecolorallocate ($this->img, mt_ Rand (157,255),  mt_rand (157,255),  mt_rand (157,255));         Imagefilledrectangle ($this-&Gt;img,0, $this->height, $this->width,0, $color);     }    //Generate text     private function createfont ()  {             $_x =  $this->width /  $this->codelen;         for  ($i =0; $i < $this->codelen; $i + +)  {              $this->fontcolor = imagecolorallocate ($ This->img,mt_rand (0,156), Mt_rand (0,156), Mt_rand (0,156));             imagettftext ($this->img, $this->fontsize,mt_rand ( -30,30), $_x* $i +mt_rand (1,5), $ this->height / 1.4, $this->fontcolor, $this->font, $this->code[$i]);         }    }    //generating lines, snowflakes      private function createliNE ()  {        for  ($i =0; $i <6; $i + +)  {              $color  = imagecolorallocate ($this Img,mt_rand (0,156), Mt_rand (0,156), Mt_rand (0,156));             imageline ($this->img,mt_rand (0, $this->width), Mt_rand (0, $this->height), Mt_rand (0, $this- >width), Mt_rand (0, $this->height), $color);        }         for  ($i =0; $i <100; $i + +)  {              $color  = imagecolorallocate ($this->img,mt_rand (200,255), Mt_ Rand (200,255), Mt_rand (200,255));             Imagestring ($this->img,mt_rand (1,5), Mt_rand (0, $this->width), Mt_rand (0, $this->height), ' * ', $color);         }    }    //Output     private  Function output ()  {        header (' Content-type:image/png ');         imagepng ($this->img);         imagedestroy ($this->img);     }    //Foreign Generation      public function doimg ()  {         $this CREATEBG ();         $this->createcode ();          $this->createline ();         $this CreateFont ();         $this->output ();     }     //Get Verification Code     public function getcode ()  {          Return strtolower ($this->code);     }} 

Nice PHP verification code class