PHP-authored image verification code class file sharing _php instance

For custom verification code classes!

<?php/* To the license header, choose License Headers in Project Properties. * To change this template file, choose Tools | Templates * and open the template in the editor.  */class image{Private $img;  Public $width = 85;  Public $height = 25;  Public $code;  Public $code _len = 4;  Public $code _str = "329832983DSDSKDSLKQWEWQ2LKFDSFSDJFDSFDSJWLKFJ93290KFDSKJFDSOIDSLK";  Public $BG _color = ' #DCDCDC ';  Public $font _size = 16;  Public $font = ' Font.ttf ';     Public $font _color = ' #000000 ';    Create a CAPTCHA hungry character create public function Create_code () {$code = ';  for ($i =0; $i < $this->code_len; $i + +) {$code. = $this->code_str[mt_rand (0, strlen ($this->code_str)-1)];  } return $this->code = $code;    }//Output image Public Function GetImage () {$w = $this->width;    $h = $this->height;    $BG _color = $this->bg_color;    $img = Imagecreatetruecolor ($w, $h); $BG _color = imagecolorallocate ($img, Hexdec (substr ($BG _color, Up)), Hexdec (substr ($BG _color, 3,2)), Hexdec (substr ($BG _color, 5,2));    Imagefill ($img, 0, 0, $bg _color);    $this->img = $img;    $this->create_font ();  $this->create_pix ();  $this->show_code ();    }//write Verification code Public Function Create_font () {$this->create_code ();    $color = $this->font_color; $font _color = imagecolorallocate ($this->img, Hexdec (substr ($color, up)), Hexdec (substr ($color, 3,2)), Hexdec (    substr ($color, 5,2)));    $x = $this->width/$this->code_len; for ($i =0; $i < $this->code_len; $i + +) {$txt _color = imagecolorallocate ($this->img, Mt_rand (0,100), Mt_rand (0,      Mt_rand (0, 200)); Imagettftext ($this->img, $this->font_size, Mt_rand ( -30,), $x * $i +mt_rand (3, 6), Mt_rand ($this->height/1.2       , $this->height), $txt _color, $this->font, $this->code[$i]); Imagestring ($this->img, $this->font_size, $x * $i +mt_rand (3, 6), Mt_rand (0, $this-&GT;HEIGHT/4), $this-    code[$i], $font _color);  } $this->font_color = $font _color;    } Draw interference Line Public function Create_pix () {$pix _color= $this->font_color; for ($i =0; $i <100; $i + +) {Imagesetpixel ($this->img, Mt_rand (0, $this->width), Mt_rand (0, $this->height), $    Pix_color);      } for ($j =0; $j <4; $j + +) {imagesetthickness ($this->img, Mt_rand (1, 2)); Imageline ($this->img, Mt_rand (0, $this->width), Mt_rand (0, $this->height), Mt_rand (0, $this->width), Mt_    Rand (0, $this->height), $pix _color);  }}//Get Verification Code Public Function GetCode () {return strtoupper ($this->code);    }//Output Verification code Private Function Show_code () {Header ("content-type:image/png");    Imagepng ($this->img);  Imagedestroy ($this->img); }}

Let's look at one more example of the code:

Generate the picture type verification code, the verification code contains the number and the capital letter, the session holds the MD5 encrypted verification code

<?php/** * Image Verification Code class * Generate image Type Verification code, verification code contains numbers and uppercase letters, the session is stored MD5 encrypted code * * Use method: * $captcha = new Catpcha (); * $captcha->buildandexportimage (); * * Author: luojing * creation time: 2013-3-27 a.m. 11:42:12 */class Captcha {private $width;//width private $height;//Height Private $codeN um;//the number of authentication code characters private $image;//Authentication Code image resource private $sessionKey; the name stored in//session private $captcha;//Authenticode string const CHARWIDTH = 10 ;//single character width, depending on the output character size/** * Create code class, initialize related parameters * @param $width picture width * @param $height picture Height * @param $codeNum number of captcha characters * @param $se The name saved in the Ssionkey session is */function __construct ($width = $codeNum, $height = 4, $sessionKey = ' captcha ') {$this-&gt ; width = $width; $this->height = $height; $this->codenum = $codeNum; $this->sessionkey = $sessionKey;// Guaranteed minimum height and width if ($height <) {$this->height = 20;} if ($width < ($codeNum * self::charwidth + 10)) {//left 5 pixels gap $this->width = $codeNum * self::charwidth + 10;} /** * Constructs and outputs the CAPTCHA image */public function buildandexportimage () {$this->createimage (); $this->setdiSturb (); $this->setcaptcha (); $this->exportimage ();} /** * Construct image, set background */private function CreateImage () {//create image $this->image = Imagecreatetruecolor ($this->width, $this-& Gt;height); Create background color $BG = imagecolorallocate ($this->image, Mt_rand (up, 255), Mt_rand (up, 255), Mt_rand (220, 255)); Fill background color imagefilledrectangle ($this->image, 0, 0, $this->width-1, $this->height-1, $BG);} /** * Set interference element */private function Setdisturb () {//Set interference point for ($i = 0; $i <; $i + +) {$color = Imagecolorallocate ($this-&gt ; image, Mt_rand (Mt_rand, Max), Mt_rand (->image), Imagesetpixel (5, Mt_rand (+), $this WIDTH-10), Mt_rand (5, $this->height-3), $color);} Set the interference line for ($i = 0; $i < $i + +) {$color = Imagecolorallocate ($this->image, Mt_rand (), Mt_rand (), M T_rand, Imagearc ($this->image, Mt_rand ( -10, $this->width), Mt_rand ( -10, $this->height), Mt_rand ( (+), Mt_rand, (+), $color);} Create border Color $border = imagecoloralLocate ($this->image, mt_rand (0, 0), Mt_rand (0, 0), Mt_rand (50));//Draw Border Imagerectangle ($this->image, 0,, $ This->width-1, $this->height-1, $border);} /** * Generate and draw Verification code */private function Setcaptcha () {$str = ' 23456789ABCDEFGHJKLMNPQRSTUVWXYZ ';//Generate CAPTCHA character for ($i = 0; $i < $th is->codenum; $i + +) {$this->captcha. = $str {mt_rand (0, strlen ($str)-1)};} Draw verification Code for ($i = 0; $i < strlen ($this->captcha); $i + +) {$color = Imagecolorallocate ($this->image, Mt_rand (0, 200) , Mt_rand (0, +), Mt_rand (0, $)), $x = Floor (($this->width-10)/$this->codenum), $x = $x * $i + Floor (($x-self::char Width)/2) + 5; $y = Mt_rand (2, $this->height-20); Imagechar ($this->image, 5, $x, $y, $this->captcha{$i}, $color); }}/* * Output image, verification code saved to session */private function Exportimage () {if (Imagetypes () & Img_gif) {header (' Content-type:image /gif '); Imagegif ($this->image);}      else if (Imagetypes () & Img_png) {header (' content-type:image/png '); Imagepng ($this->iamge);} else if (iMagetypes () & Img_jpeg) {header (' content-type:image/jpeg '); Imagepng ($this->iamge);} else {Imagedestroy ($this->image);d ie ("Don t support image type!");} Save the CAPTCHA information to the SESSION, MD5 encryption if (!isset ($_session)) {session_start ();} $_session[$this->sessionkey] = MD5 ($this    CAPTCHA); Imagedestroy ($this->image); }function __destruct () {unset ($this->width, $this->height, $this->codenum, $this->captcha);}}

Example three:

<?php class Validationcode {private $width; private $height; private $codeNum; private $image; Image Resources Private $disturbColorNum; Private $checkCode;  function __construct ($width =80, $height =20, $codeNum =4) {$this->width= $width;  $this->height= $height;  $this->codenum= $codeNum;  $this->checkcode= $this->createcheckcode ();   =floor ($width * $height/15);  if (> 240-$codeNum) {$this->disturbcolornum= 240-$codeNum;  }else{$this->disturbcolornum=;  }}//By accessing the method to output image function ShowImage ($fontFace = "") {///First step: Create Image Background $this->createimage ();  Step two: Set the interfering element $this->setdisturbcolor ();  The third step: randomly draw text $this->outputtext ($fontFace) to the image; Fourth step: Output Image $this->outputimage (); }//By calling this method to obtain a randomly created Authenticode string function Getcheckcode () {return $this->checkcode;} private Function CreateImage () {//Create image capital  SOURCE $this->image=imagecreatetruecolor ($this->width, $this->height); Random background color $backColor =imagecolorallocate ($this->image, rand (225, 255), Rand (225,255), rand (225, 255));  Fill the background with color Imagefill ($this->image, 0, 0, $backColor);  Set Border color $border =imagecolorallocate ($this->image, 0, 0, 0); Draw a rectangular border Imagerectangle ($this->image, 0, 0, $this->width-1, $this->height-1, $border); } Private Function Setdisturbcolor () {for ($i =0; $i < $this->disturbcolornum; $i + +) {$color =imagecolorallocate ($  This->image, rand (0, 255), rand (0, 255), rand (0, 255));  Imagesetpixel ($this->image, rand (1, $this->width-2), rand (1, $this->height-2), $color);   } for ($i =0; $i <10; $i + +) {$color =imagecolorallocate ($this->image, rand (255), Rand (255), rand (200, 255));  Imagearc ($this->image, rand ( -10, $this->width), rand ( -10, $this->height), rand (+), rand (20, 200), 55, 44,  $color); }} Private Function Createcheckcode () {//Here mainly generates random codes, starting from 2 to differentiate between 1 and l $code = "  23456789abcdefghijkmnpqrstuvwxyzABCDEFGHIJKMNPQRSTUVWXYZ ";  $string = "; for ($i =0; $i < $this->codenum; $i + +) {$char = $code {rand (0, strlen ($Code)-1};  $string. = $char; } return $string; } Private Function Outputtext ($fontFace = "") {for ($i =0; $i < $this->codenum; $i + +) {$fontcolor =imagecolorallocate (  $this->image, rand (0, +), rand (0, +), rand (0, 128));   if ($fontFace = = "") {$fontsize =rand (3, 5);   $x =floor ($this->width/$this->codenum) * $i +3;   $y =rand (0, $this->height-15);  Imagechar ($this->image, $fontsize, $x, $y, $this->checkcode{$i}, $fontcolor);   }else{$fontsize =rand (12, 16);   $x =floor (($this->width-8)/$this->codenum) * $i +8;   $y =rand ($fontSize +5, $this->height);  Imagettftext ($this->image, $fontsize, Rand ( -30,), $x, $y, $fontcolor, $fontFace, $this->checkcode{$i});  }}} Private Function Outputimage () {if (Imagetypes () & Img_gif) {header ("content-type:image/gif");  Imagepng ($this->image);  }else if (Imagetypes () & img_jpg) {header ("content-type:image/jpeg");  Imagepng ($this->image);  }else if (Imagetypes () & Img_png) {header ("content-type:image/png");Imagepng ($this->image);  }else if (Imagetypes () & Img_wbmp) {header ("content-type:image/vnd.wap.wbmp");  Imagepng ($this->image);  }else{die ("PHP does not support image creation");  }} function __destruct () {Imagedestroy ($this->image);}}

Use the following:

Testing, calling the Captcha class
code.php

<?phpsession_start (), include "validationcode.class.php", $code =new Validationcode (4); $code->showimage ();  Output to the page for registration or login using $_session["code"]= $code->getcheckcode (); Save the CAPTCHA to the server

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