html' target='_blank'>PHP制作驗證碼詳細教程

效果：

myvcode.class.php：封裝創建驗證碼的類

   1: <?php

   2: /*

   3: * file:myvcode.class.php

   4: * 驗證碼類,類名Vcode

   5: */

   6: class Vcode

   7: {

   8:     private $width;              /*驗證碼寬度*/

   9:     private $height;             /*驗證碼高度*/

  10:     private $codeNum;            /*驗證碼字符個數*/

  11:     private $checkCode;            /*驗證碼字符*/

  12:     private $image;                /*驗證碼資源*/

  13:     private $pixNum;            /*繪制干擾點的個數*/

  14:     private $lineNum;            /*繪制干擾線的條數*/

  15:

  16:     /*

  17:     *構造方法實例化驗證碼對象，并初始化數據

  18:     *@param int $width         設置默認寬度

  19:     *@param int $height     設置默認高度

  20:     *@param int $codeNum    設置驗證碼中的字符個數

  21:     *@param int $pixNum        設置干擾點的個數

  22:     *@param int $lineNum    設置干擾線的數量

  23:     */

  24:     function __construct($width=80,$height=40,$codeNum=4,$pixNum=40,$lineNum=5)

  25:     {

  26:         $this->width = $width;

  27:         $this->height = $height;

  28:         $this->codeNum = $codeNum;

  29:         $this->pixNum = $pixNum;

  30:         $this->lineNum = $lineNum;

  31:     }

  32:     /*內部私有方法,創建圖像資源*/

  33:     private function getCreateImage()

  34:     {

  35:         $this->image = imagecreatetruecolor($this->width, $this->height);

  36:         $white = imagecolorallocate($this->image,0xff,0xff,0xff);

  37:         imagefill($this->image, 0, 0, $white);

  38:         $black = imagecolorallocate($this->image,0,0,0);

  39:         imagerectangle($this->image, 0, 0, $this->width-1, $this->height-1, $black);

  40:     }

  41:     /*內部私有方法,繪制字符，去掉o0Llz和012*/

  42:     private function createCheckCode()

  43:     {

  44:         $code = '3456789abcdefghijkmnpqrstuvwxyABCDEFGHIJKMNPQRSTUVWXY';

  45:         $this->checkCode = "";

  46:         for($i=0; $i<$this->codeNum;$i++)

  47:         {

  48:             $char = $code{rand(0,strlen($code) - 1)};

  49:             $this->checkCode .= $char;

  50:             $fontColor = imagecolorallocate($this->image, rand(0,128), rand(0,128),rand(0,128));

  51:             $fontSize = rand(3,5);

  52:             $x = rand(0,$this->width-imagefontwidth($fontSize));

  53:             $y = rand(0,$this->height-imagefontheight($fontSize));

  54:             imagechar($this->image, $fontSize, $x, $y, $char, $fontColor);

  55:         }

  56:     }

  57:     /*內部私有方法設置干擾元素*/

  58:     private function setDisturbColor()

  59:     {

  60:         /*繪制干擾點*/

  61:         for($i=0; $i<$this->pixNum; $i++)

  62:         {

  63:             $color = imagecolorallocate($this->image, rand(0,255), rand(0,255), rand(0,255));

  64:             imagesetpixel($this->image, rand(1,$this->width-2), rand(1,$this->height-2), $color);

  65:         }

  66:         /*繪制干擾線*/

  67:         for($i=0; $i<$this->lineNum; $i++)

  68:         {

  69:             $color = imagecolorallocate($this->image, rand(0,255), rand(0,255), rand(0,255));

70: imageline($this->image, rand(1,$this->width / 2), rand(1,$this->height / 2),

rand($this->width / 2,$this->width – 2), rand($this->height / 2,$this->height – 2), $color);

  71:         }

  72:     }

  73:     /*開啟session保存 利用echo 輸出圖像*/

  74:     function __toString()

  75:     {

  76:         $_SESSION['code'] = strtoupper($this->checkCode);

  77:         $this->getCreateImage();

  78:         $this->createCheckCode();

  79:         $this->setDisturbColor();

  80:         $this->outputImg();

  81:     }

  82:     /*內部私有方法輸出圖像*/

  83:     private function outputImg()

  84:     {

  85:         header("content-type:image/png");

  86:         imagepng($this->image);

  87:     }

  88:     /*析構方法，釋放對象*/

  89:     function __destruct()

  90:     {

  91:         imagedestroy($this->image);

  92:     }

  93: }

  94: ?>

imgcode.php輸出圖像

   1: <?php

   2: session_start();

   3: require_once('myvcode.class.php');

   4: echo new Vcode();

   5: ?>

test.html:同過img標簽引用

   1: <img src="imgcode.php">

/*局部刷新換驗證碼*/function changeCode(){	var imgcode = document.getElementById('code');	var change = document.getElementById('change');	change.onclick = function()	{		/*必須加后面的參數才能刷新*/		imgcode.src='code.php?tm'+Math.random();	}}

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