<button id="e6ic9"><bdo id="e6ic9"></bdo></button>
 \r\n username:  \r\n
 password: \r\n
 code:  \r\n \r\n
 \r\n \r\n
 \r\n<\/form> \r\n<\/body><\/pre>"}

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Home php教程 php手冊(cè) 一個(gè)經(jīng)典的PHP驗(yàn)證碼類分享

一個(gè)經(jīng)典的PHP驗(yàn)證碼類分享

Jul 15, 2017 pm 05:36 PM
php

這篇文章主要介紹了一個(gè)經(jīng)典的PHP驗(yàn)證碼類分享,本文不僅提供了類代碼,還提供了使用例子及表單中使用的方法,需要的朋友可以參考下

我們通過PHP的GD庫圖像處理內(nèi)容,設(shè)計(jì)一個(gè)驗(yàn)證碼類Vcode。將該類聲明在文件vcode.class.php中,并通過面向?qū)ο蟮奶匦詫⒁恍?shí)現(xiàn)的細(xì)節(jié)封裝在該類中。只要在創(chuàng)建對(duì)象時(shí),為構(gòu)造方法提供三個(gè)參數(shù),包括創(chuàng)建驗(yàn)證碼圖片的寬度、高度及驗(yàn)證碼字母?jìng)€(gè)數(shù),就可以成功創(chuàng)建一個(gè)驗(yàn)證碼類的對(duì)象。該類的聲明代碼如下所示:

在上面的腳本中,雖然聲明驗(yàn)證碼類Vcode的代碼比較多,但細(xì)節(jié)都被封裝在類中,只要直接輸出對(duì)象,就可以向客戶端瀏覽器中輸出幅圖片,并可以在瀏覽器表單中使用。另外本類自動(dòng)獲取驗(yàn)證碼圖片中的字符串,促成在服務(wù)的$_SESSION["code"]中。在提交表單時(shí),只有用戶在表單中輸入驗(yàn)證碼圖片上顯示的文字,并和服務(wù)器中保留的驗(yàn)證碼字符串完全相同時(shí),表單才可以提交成功。(注意:驗(yàn)證碼在服務(wù)器端在$_SESSION["code"]中,所以必須開啟session會(huì)話才能使用該類,)

  在下面的腳本code.php中,使用session_start()開啟用戶會(huì)話控制,然后包含驗(yàn)證碼類Vcode所在文件vcode.class.php,創(chuàng)建該類對(duì)象并直接輸出。就可以將隨機(jī)生成的驗(yàn)證碼圖片發(fā)送出去,同時(shí)會(huì)自動(dòng)將這個(gè)驗(yàn)證碼字符串保存在服務(wù)器中一份。代碼如下所示:

<?php 
class Vcode { 
private $width; //寬 
private $height; //高 
private $num; //數(shù)量 
private $code; //驗(yàn)證碼 
private $img; //圖像的資源 //構(gòu)造方法, 三個(gè)參數(shù) 
function __construct($width=80, $height=20, $num=4) 
{ 
$this->width = $width; 
$this->height = $height; 
$this->num = $num; 
$this->code = $this->createcode(); 
//調(diào)用自己的方法 
} 
//獲取字符的驗(yàn)證碼,, 用于保存在服務(wù)器中 
function getcode() { 
return $this->code; 
} 
//輸出圖像 
function outimg() { 
//創(chuàng)建背景 (顏色, 大小, 邊框)
 $this->createback(); 
 //畫字 (大小, 字體顏色) 
 $this->outstring(); 
 //干擾元素(點(diǎn), 線條) 
 $this->setdisturbcolor(); 
 //輸出圖像 
 $this->printimg(); } 
 //創(chuàng)建背景 
 private function createback() { 
 //創(chuàng)建資源 
 $this->img = imagecreatetruecolor($this->width, $this->height); 
 //設(shè)置隨機(jī)的背景顏色 
 $bgcolor = imagecolorallocate($this->img, rand(225, 255), rand(225, 255), rand(225, 255)); 
 //設(shè)置背景填充 
 imagefill($this->img, 0, 0, $bgcolor); 
 //畫邊框 
 $bordercolor = imagecolorallocate($this->img, 0, 0, 0); 
 imagerectangle($this->img, 0, 0, $this->width-1, $this->height-1, $bordercolor); } 
 //畫字 
 private function outstring() { 
 for($i=0; $i<$this->num; $i++) {
  $color= imagecolorallocate($this->img, rand(0, 128), rand(0, 128), rand(0, 128)); 
  $fontsize=rand(3,5); //字體大小 
  $x = 3+($this->width/$this->num)*$i; //水平位置 
  $y = rand(0, imagefontheight($fontsize)-3); //畫出每個(gè)字符 
  imagechar($this->img, $fontsize, $x, $y, $this->code{$i}, $color); } } 
  //設(shè)置干擾元素 
  private function setdisturbcolor() { 
  //加上點(diǎn)數(shù) 
  for($i=0; $i<100; $i++) { 
  $color= imagecolorallocate($this->img, rand(0, 255), rand(0, 255), rand(0, 255)); 
  imagesetpixel($this->img, rand(1, $this->width-2), rand(1, $this->height-2), $color); } 
  //加線條 
  for($i=0; $i<10; $i++) { $color= imagecolorallocate($this->img, rand(0, 255), rand(0, 128), rand(0, 255)); 
  imagearc($this->img,rand(-10, $this->width+10), rand(-10, $this->height+10), rand(30, 300), rand(30, 300), 
  55,44, $color); } } 
  //輸出圖像 
  private function printimg() { 
  if (imagetypes() & IMG_GIF) { 
  header("Content-type: image/gif"); 
  imagegif($this->img); } 
  elseif (function_exists("imagejpeg")) 
  { header("Content-type: image/jpeg"); 
  imagegif($this->img); } elseif (imagetypes() & IMG_PNG) 
  { header("Content-type: image/png"); 
  imagegif($this->img); } else { die("No image support in this PHP server"); } }
   //生成驗(yàn)證碼字符串
    private function createcode() 
    { 
    $codes = "3456789abcdefghijkmnpqrstuvwxyABCDEFGHIJKLMNPQRSTUVWXY"; 
    $code = ""; 
    for($i=0; $i < $this->num; $i++) 
    { 
    $code .=$codes{rand(0, strlen($codes)-1)}; } 
    return $code; 
    } 
    //用于自動(dòng)銷毀圖像資源 
    function __destruct() { 
    imagedestroy($this->img);
    } 
    }

  在下面的腳本code.php中,使用session_start()開啟用戶會(huì)話控制,然后包含驗(yàn)證碼類Vcode所在文件vcode.class.php,創(chuàng)建該類對(duì)象并直接輸出。就可以將隨機(jī)生成的驗(yàn)證碼圖片發(fā)送出去,同時(shí)會(huì)自動(dòng)將這個(gè)驗(yàn)證碼字符串保存在服務(wù)器中一份。代碼如下所示:

<?php 
//開啟
session session_start();
 include "vcode.class.php"; 
 //構(gòu)造方法 
 $vcode = new Vcode(80, 30, 4); 
 //將驗(yàn)證碼放到服務(wù)器自己的空間保存一份 
 $_SESSION[&#39;code&#39;] = $vcode->getcode(); 
 //將驗(yàn)證碼圖片輸出 
 $vcode->outimg(); 
 ?>

表單代碼如下所示:

<?php 
session_start(); 
if(isset($_POST[&#39;dosubmit&#39;])) { 
if(strtoupper($_SESSION[&#39;code&#39;]) == strtoupper($_POST[&#39;code&#39;]) ) { 
echo "輸入成功!<br>"; }else{ echo "輸入不對(duì)!<br>"; } } 
?> 
<body> 
<form action="reg.php" method="post"> username: <input type="text"> 
<br> password: <input type="password">
<br> code: <input type="text" 
onkeyup="if(this.value!=this.value.toUpperCase()) this.value=this.value.toUpperCase()" size="6"> 
<img src="code.php" /> 
<br> 
<input type="submit" value="登 錄"> 
<br> 
</form> 
</body>
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