直接上代碼:
//驗證碼類class ValidateCode {private $charset = 'abcdefghkmnprstuvwxyzABCDEFGHKMNPRSTUVWXYZ23456789';//隨機因子private $code;//驗證碼private $codelen = 4;//驗證碼長度private $width = 130;//寬度private $height = 50;//高度private $img;//圖形資源控制代碼private $font;//指定的字型private $fontsize = 20;//指定字型大小private $fontcolor;//指定字型顏色//構造方法初始化public function __construct() {$this->font = dirname(__FILE__).'/font/elephant.ttf';//注意字型路徑要寫對，否則顯示不了圖片}//產生隨機碼private function createCode() {$_len = strlen($this->charset)-1;for ($i=0;$i<$this->codelen;$i++) {$this->code .= $this->charset[mt_rand(0,$_len)];}}//產生背景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,$color);}//產生文字private function createFont() {$_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]);}}//產生線條、雪花private function createLine() {//線條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),$color);}//雪花for ($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);}}//輸出private function outPut() {header('Content-type:image/png');imagepng($this->img);imagedestroy($this->img);}//對外產生public function doimg() {$this->createBg();$this->createCode();$this->createLine();$this->createFont();$this->outPut();}//擷取驗證碼public function getCode() {return strtolower($this->code);}}
輸出執行個體：
使用方法：
1、先把驗證碼類儲存為一個名為 ValidateCode.class.php 的檔案；
2、建立一個名為 captcha.php 的檔案進行調用該類；
captcha.php
session_start();require './ValidateCode.class.php'; //先把類包含進來，實際路徑根據實際情況進行修改。$_vc = new ValidateCode();//執行個體化一個對象$_vc->doimg();$_SESSION['authnum_session'] = $_vc->getCode();//驗證碼儲存到SESSION中
3、引用到頁面中，代碼如下：
<img title="點擊重新整理" src="./captcha.php" align="absbottom" onclick="this.src='captcha.php?'+Math.random();"></img>
4、一個完整的驗證頁面，代碼如下：
<?phpsession_start();//在頁首先要開啟session,//error_reporting(2047);session_destroy();//將session去掉，以每次都能取新的session值;//用seesion 效果不錯，也很方便?><html><head><title>session 圖片驗證執行個體</title><style type="text/css">#login p{margin-top: 15px;line-height: 20px;font-size: 14px;font-weight: bold;}#login img{cursor:pointer;}form{margin-left:20px;}</style></head> <body> <form id="login" action="" method="post"><p>此例為session驗證執行個體</p><p><span>驗證碼：</span><input type="text" name="validate" value="" size=10> <img title="點擊重新整理" src="./captcha.php" align="absbottom" onclick="this.src='captcha.php?'+Math.random();"></img></p><p><input type="submit"></p></form><?php//列印上一個session;//echo "上一個session：<b>".$_SESSION["authnum_session"]."</b><br>";$validate="";if(isset($_POST["validate"])){$validate=$_POST["validate"];echo "您剛才輸入的是：".$_POST["validate"]."<br>狀態：";if($validate!=$_SESSION["authnum_session"]){//判斷session值與使用者輸入的驗證碼是否一致;echo "<font color=red>輸入有誤</font>"; }else{echo "<font color=green>通過驗證</font>"; }} ?>
完整demo下載：demo
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