驗證碼 · php

[TOC] 自己寫的驗證碼是這幾個文件 Captch.class.php(驗證碼工具類) home.html(前臺頁面,入口文件) check.php(檢查處理文件) # Captcha.class.php ~~~ <?php class Captcha{ //碼值庫 private $charset =<<<"herdoc" abcdefghkmnprstuvwxyzabcdefghkmnprstuvwxyzABCDEFGHKMNPRSTUVWXYZ01234567890123456789 lol英雄如下戰爭女神希維爾輪子媽曙光女神蕾歐娜風暴女神迦娜皎月女神黛安娜朋友圈都是賣面膜真的好煩 herdoc; private $code; //驗證碼字符串 private $codelen = 4; //驗證碼長度 private $width = 150; //寬度 private $height = 50; //高度 private $img; //圖形資源句柄 private $font; //指定的字體 private $fontsize = 20; //指定字體大小 private $fontcolor; //指定字體顏色 //構造方法初始化 /** * @param $codelen=4,$width=150,$height=40,$fontsize = 20,$font="Elephant.ttf" * @access public */ public function __construct($codelen=4,$width=150,$height=40,$fontsize = 20,$font="./simkai.ttf") { $this->charset = str_replace(" ", "x", $this->charset); $this->charset = str_replace("\n", "j", $this->charset); $this->charset = str_replace("\r", "d", $this->charset); $this->charset = str_replace("\t", "z", $this->charset); $this->codelen = $codelen; $this->width = $width; $this->height = $height; $this->fontsize = $fontsize; $this->font = $font; } /** * 生成隨機碼,也就是碼值,保存到$this->code * @access private * @return void */ private function createCode() { $_len = mb_strlen($this->charset,'utf-8')-1; $this->code=""; //初始化碼值字符串 for($i=0;$i<$this->codelen;++$i){ $rand_index = mt_rand(0,$_len); $this->code .= mb_substr($this->charset,$rand_index,1,'utf-8'); } /* for ($i=0;$i<$this->codelen;++$i) { $this->code .= mb_substr($this->charset,mt_rand(0,$_len),1,'utf-8'); } */ } /** * 生成背景色 * @access private * @return void */ private function createBg() { $this->img = imagecreatetruecolor($this->width, $this->height); $color = imagecolorallocate($this->img, mt_rand(170,250), mt_rand(170,255), mt_rand(170,255)); imagefilledrectangle($this->img,0,$this->height,$this->width,0,$color); } /** * 生成文字到畫布 * @access private * @return void */ 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(0,160),mt_rand(0,160));; imagettftext($this->img,$this->fontsize,mt_rand(-30,50),$_x*$i+mt_rand(1,5),$this->height / 1.4,$this->fontcolor,$this->font,mb_substr($this->code,$i,1,'utf-8')); } } /** * 生成線條、雪花 * @access private * @return void */ private function createLine() { for ($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(150,200),mt_rand(200,255),mt_rand(150,255)); imagestring($this->img,mt_rand(1,5),mt_rand(0,$this->width),mt_rand(0,$this->height),'*',$color); } //點 for($k=0;$k<300;$k++){ $color=imagecolorallocate($this->img,mt_rand(0,200),mt_rand(0,200),mt_rand(0,200)); imagesetpixel($this->img,mt_rand(1,$this->width-2),mt_rand(1,$this->height-2),$color); } //圓弧 for($a=0;$a<20;$a++){ $color=imagecolorallocate($this->img,mt_rand(0,200),mt_rand(0,200),mt_rand(0,200)); imagearc($this->img,mt_rand(10,$this->width-10),mt_rand(4,$this->height-5),mt_rand(20,100),mt_rand(20,100),20,100,$color); } } /** * 輸出到網頁 * @access private */ private function outPut() { ob_end_clean(); //清空前面的輸出 if(imagetypes()&IMG_GIF){ header("Content-Type:image/gif"); imagegif($this->img); }elseif(imagetypes()&IMG_PNG){ header("Content-Type:image/png"); imagepng($this->img); }elseif(imagetypes()&IMG_JPEG){ header("Content-Type:image/jpge"); imagejpeg($this->img,null,100); }else{ die("error:no image in the php server"); } imagedestroy($this->img); } /** * 對外生成 * @access private * @return 驗證碼 */ public function generateCode() { $this->createBg(); $this->createCode(); $this->createLine(); $this->createFont(); $this->outPut(); } /** * 獲取驗證碼的正確碼值 * @access public * @return string 小寫的驗證碼碼值 */ public function getCode() { return strtolower($this->code); } } $c = new Captcha(); $c->generateCode(); @session_start(); $_SESSION['captcha'] = $c->getCode(); ~~~ # home.html ~~~ <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>session 圖片驗證實例</title> <style type="text/css"> #login p{ margin-top: 15px; line-height: 20px; font-size: 14px; font-weight: bold; } #login img{ cursor:pointer; } form{ margin-left:20px; } </style> </head> <body> <?php @session_start(); header('Expires：-1'); header('Cache-Control:no-cache'); header('Pragma:no-cache'); ?> <form id="login" action="./check.php" method="post"> <p>此例為session驗證碼,不區分大小寫,點擊圖片更換</p> <p> <span>驗證碼：</span> <input type="text" name="validate" value="" size=10> <img title="點擊刷新" src="Captcha.class.php" onclick="this.src='Captcha.class.php?r='+Math.random()"></img> </p> <p> <input type="submit"> </p> </form> ~~~ # check.php ~~~ <?php @session_start(); echo "<a href='./home.html'>返回驗證</a><br /><br />"; if(isset($_POST["validate"])){ $validate=mb_strtolower(trim($_POST["validate"]),'utf-8'); echo "您剛才輸入的是!<font color='blue'>".$_POST["validate"]."</font>!<br>"; if($validate != $_SESSION["captcha"]){ //判斷session值與用戶輸入的驗證碼是否一致; echo "<font color=red>輸入有誤</font>"; echo "<br />答案是!<font color='blue'>".$_SESSION['captcha'],"</font>!<br />"; }else{ echo "<font color=green>通過驗證</font>"; echo "<br />答案是!<font color='blue'>".$_SESSION['captcha'],"</font>!<br />"; } } ?> ~~~