PHP Verification Code Class example

  This article mainly introduces a useful PHP verification code Class example, the need for friends can refer to the

Share a handy PHP authentication code class, including the call example. Note: If you do not apply the specified font, then use the imagestring () function, and if you need to encounter the specified font, use the Imagettftext () function. The position of the font is windows/fonts under C disk.   Reference to the online PHP generated verification code method, as well as PHP image verification code and PHP Chinese verification code generation method. Use of the PHP GD library related knowledge.   1, generate the Verification code class VerificationCode.class.php   code as follows: <?php       class verificationcode{  &nbs P       Private $charset = "abcdefghjkmnpqrstuvwxyzABCDEFGHJKMNPQRSTUVWXYZ23456789";  //random factor           private $code;  //Verification Code           Private $codelen = 4; Verification code length           private $width = 110; Width           private $height = 30; Height           private $img;  //Image resource handle           private $font;  //set font           private $fontSize = 25;  //font size           private $fontColor; Font Color           public Function __construct () {  &nbsp           $this->font= "Calibriz. TTF ";           {         //Generate verification code           Private function Createcode () {              $len =strlen ($this->charset)-1;     & nbsp         for ($i = 0 $i < $this->codelen; $i + +) {            &NBS P     $this->code. = $this->charset[mt_rand (0, $len)];               I                     Generate background           Private Function 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->img,0, $this->height, $this->width,0, $color);           {         //Generate text           Private function CreateFont () {              $x = $this->width/$this->codelen;   &nbs P           for ($i = 0 $i < $this->codelen; $i + +) {          &NBS P       $this->fontcolor=imagecolorallocate ($this->img,mt_rand (0,156), Mt_rand (0,156), Mt_rand ( 0,156));                   Imagettftext ($this->img, $this->fontsize,mt_rand (- 30,30), $i * $x +mt_rand (1,5), $this->height/1.4, $this->fontcolor, $this->font, $this->code[$i]);  //www.jbxue.com                //imagestring ($this->img,5, $i * $x +mt_ Rand (1,5), 5, $this->code[$i], $this->fontcolor);              {         }          //Generate line, snowflake &NB Sp         Private Function createdisturb () {              for ($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->width), Mt_rand (0, $this->width), Mt_rand (0, $this->width), $color);               $i               for ($i = 0; < 1 00; $i + +) {                  $color =imagecolorallocate ($this->img,mt_rand (20 0,255), 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), ' * ', $color);               I                     Output           Private Function OutPut () {              Heade R ("Content-type:image/png");               imagepng ($this->img);               Imagedestroy ($this->img);           {          public Function ShowCode () {      & nbsp       $this->CREATEBG ();               $this->createcode ();               $this->createdisturb ();               $this->createfont ();               $this->output ();         &NBsp          //get validation code           public Function GetCode () {    & nbsp         return Strtolower ($this->code);           {     }  ?>     code.php     code as follows: <?p HP       session_start ();       require_once ' VerificationCode.class.php ';       $code =new verificationcode ();       $_session[' code ']= $code->getcode ();       $code->showcode ();  ?>     Verification code: <input type= "text" name= "code"/><img src= "code.php" onclick= "javascript: This.src= ' code.php?time= ' +math.random (); "/>