1. 程式人生 > >php驗證碼類(分享)

php驗證碼類(分享)

 

//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
 }
 //生成隨機碼
 private function createCode() {
  $_len = strlen($this->charset)-1;
  for ($i=0;$i<$this->codelen;$i++) {
   $this->code .= $this->charset[mt_rand(0,$_len)];
  }
 }
 //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);
 }
 //對外生成
 public function doimg() {
  $this->createBg();
  $this->createCode();
  $this->createLine();
  $this->createFont();
  $this->outPut();
 }
 //獲取驗證碼
 public function getCode() {
  return strtolower($this->code);
 }
}

 

輸出例項:

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、新建一個名為 captcha.php 的檔案進行呼叫該類;
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();  //例項化一個物件
$_vc->doimg();  
$_SESSION['authnum_session'] = $_vc->getCode();//驗證碼儲存到SESSION中

3、引用到頁面中,程式碼如下:

<img  title="點選重新整理" src="./captcha.php" align="absbottom" onclick="this.src='captcha.php?'+Math.random();"></img>

4、一個完整的驗證頁面,程式碼如下:

 

<?php
session_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 圖片驗證例項</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">
 此例為session驗證例項 
 
<span>驗證碼:</span>
<input type="text" name="validate" value="" size=10> 
<img  title="點選重新整理" src="./captcha.php" align="absbottom" onclick="this.src='captcha.php?'+Math.random();"></img>
 
 
<input type="submit">
 
</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>"; 
}
} 
?>
 

https://www.cnblogs.com/superfeeling/p/4675676.html