驗(yàn)證碼:<\/span>
<\/img><\/p><\/p><\/form>\".$_SESSION[\"authnum_session\"].\"<\/b>
\";\r\n $validate=\"\";\r\n if(isset($_POST[\"validate\"])) {\r\n $validate=$_POST[\"validate\"];\r\n echo \"您剛才輸入的是:\".$_POST[\"validate\"].\"
狀態(tài):\";\r\n if($validate!=$_SESSION[\"authnum_session\"]) {\r\n \/\/判斷session值與用戶(hù)輸入的驗(yàn)證碼是否一致;\r\n echo \"輸入有誤<\/font>\";\r\n}\r\nelse {\r\n echo \"通過(guò)驗(yàn)證<\/font>\";\r\n}\r\n} ?><\/pre><\/p>"}
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How to build a beautiful PHP verification code class file and how to call it
How to build a beautiful PHP verification code class file and how to call it
Oct 05, 2017 pm 03:31 PM
php
document
transfer
//驗(yàn)證碼類(lèi)
class ValidateCode {
private $charset = 'abcdefghkmnprstuvwxyzABCDEFGHKMNPRSTUVWXYZ23456789';//隨機(jī)因子
private $code;//驗(yàn)證碼
private $codelen = 4;//驗(yàn)證碼長(zhǎng)度
private $width = 130;//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(gòu)造方法初始化
public function __construct() {
$this->font = dirname(__FILE__).'/font/elephant.ttf';//注意字體路徑要寫(xiě)對(duì),否則顯示不了圖片
}
//生成隨機(jī)碼
private function createCode() {
$_len = strlen($this->charset)-1;
for ($i=0;$i<$this->codelen;$i++) {
$this->code .= $this->charset[mt_rand(0,$_len)];
}
}
//生成背景
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);
}
//生成文字
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[$i]);
}
}
//生成線(xiàn)條、雪花
private function createLine() {
//線(xiàn)條
for ($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(duì)外生成
public function doimg() {
$this->createBg();
$this->createCode();
$this->createLine();
$this->createFont();
$this->outPut();
}
//獲取驗(yàn)證碼
public function getCode() {
return strtolower($this->code);
}
}

Instructions for use:
1. First save the verification code class as a file named ValidateCode.class.php;
2. Create a new file named captcha.php to call this class;
captcha.php

##3. Quote Go to the page, the code is as follows:

#4. A complete verification page, the code is as follows:
<?phpsession_start();
//在頁(yè)首先要開(kāi)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(cuò),也很方便?><html><head><title>session 圖片驗(yàn)證實(shí)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>
<form id="login" action="" method="post"><p>此例為session驗(yàn)證實(shí)例</p><p><span>驗(yàn)證碼:</span><input type="text" name="validate" value="" size=10> <img title="點(diǎn)擊刷新" src="./captcha.php" align="absbottom" onclick="this.src='captcha.php?'+Math.random();
"></img></p><p><input type="submit"></p></form><?php//打印上一個(gè)session;
//echo "上一個(gè)session:<b>".$_SESSION["authnum_session"]."</b><br>";
$validate="";
if(isset($_POST["validate"])) {
$validate=$_POST["validate"];
echo "您剛才輸入的是:".$_POST["validate"]."<br>狀態(tài):";
if($validate!=$_SESSION["authnum_session"]) {
//判斷session值與用戶(hù)輸入的驗(yàn)證碼是否一致;
echo "<font color=red>輸入有誤</font>";
}
else {
echo "<font color=green>通過(guò)驗(yàn)證</font>";
}
} ?>
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