PHP implements click-to-refresh verification code

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PHP implements click-to-refresh verification code_php tips

May 16, 2016 pm 08:05 PM

Verification code class file CreateImg.class.php

&lt;&#63;php 
 
class ValidationCode 
{ 
private $width,$height,$codenum; 
public $checkcode;   //产生的验证码 
private $checkimage;  //验证码图片 
private $disturbColor = ''; //干扰像素 
 
function __construct($width='80',$height='20',$codenum='4') 
{ 
  $this-&gt;width=$width; 
  $this-&gt;height=$height; 
  $this-&gt;codenum=$codenum; 
} 
function outImg() 
{ 
  //输出头 
  $this-&gt;outFileHeader(); 
  //产生验证码 
  $this-&gt;createCode(); 
 
  //产生图片 
  $this-&gt;createImage(); 
  //设置干扰像素 
  $this-&gt;setDisturbColor(); 
  //往图片上写验证码 
  $this-&gt;writeCheckCodeToImage(); 
  imagepng($this-&gt;checkimage); 
  imagedestroy($this-&gt;checkimage); 
} 
 
private function outFileHeader() 
{ 
  header ("Content-type: image/png"); 
} 
 
private function createCode() 
{ 
  $this-&gt;checkcode = strtoupper(substr(md5(rand()),0,$this-&gt;codenum)); 
} 
 
private function createImage() 
{ 
  $this-&gt;checkimage = @imagecreate($this-&gt;width,$this-&gt;height); 
  $back = imagecolorallocate($this-&gt;checkimage,255,255,255); 
  $border = imagecolorallocate($this-&gt;checkimage,0,0,0);  
  imagefilledrectangle($this-&gt;checkimage,0,0,$this-&gt;width - 1,$this-&gt;height - 1,$back); // 白色底 
  imagerectangle($this-&gt;checkimage,0,0,$this-&gt;width - 1,$this-&gt;height - 1,$border);  // 黑色边框 
} 
 
private function setDisturbColor() 
{ 
  for ($i=0;$i&lt;=200;$i++) 
  { 
  $this-&gt;disturbColor = imagecolorallocate($this-&gt;checkimage, rand(0,255), rand(0,255), rand(0,255)); 
  imagesetpixel($this-&gt;checkimage,rand(2,128),rand(2,38),$this-&gt;disturbColor); 
  } 
} 
 
private function writeCheckCodeToImage() 
{ 
  for ($i=0;$i&lt;=$this-&gt;codenum;$i++) 
  { 
  $bg_color = imagecolorallocate ($this-&gt;checkimage, rand(0,255), rand(0,128), rand(0,255)); 
  $x = floor($this-&gt;width/$this-&gt;codenum)*$i; 
  $y = rand(0,$this-&gt;height-15); 
  imagechar ($this-&gt;checkimage, rand(5,8), $x, $y, $this-&gt;checkcode[$i], $bg_color); 
  } 
} 
function __destruct() 
{ 
  unset($this-&gt;width,$this-&gt;height,$this-&gt;codenum); 
} 
} 
&#63;&gt;

Copy after login

Includes file imgcode.php

&lt;&#63;php 
session_start(); 
require_once('CreateImg.class.php'); 
$image = new ValidationCode('80','20','4');  //图片长度、宽度、字符个数 
$image-&gt;outImg(); 
$_SESSION['validationcode'] = $image-&gt;checkcode; //存贮验证码到 $_SESSION 中 
&#63;&gt;

Copy after login

Front-end file demo.php

&#63;php 
session_start(); 
$test = $_POST['test']; 
$test = strtoupper(trim($test)); 
$submit = $_POST['submit']; 
if(isset($submit)){ 
if($test==$_SESSION['validationcode']){ 
  echo 'true'; 
} else { 
  echo 'false'; 
} 
} 
&#63;&gt; 
 
&lt;html&gt; 
&lt;head&gt; 
&lt;title&gt;Image&lt;/title&gt; 
&lt;meta http-equiv="content-type" content="text/html;charset=utf-8"&gt; 
&lt;script language="javascript"&gt; 
function newgdcode(obj,url) { 
obj.src = url+ '&#63;nowtime=' + new Date().getTime(); 
//后面传递一个随机参数，否则在IE7和火狐下，不刷新图片 
} 
&lt;/script&gt; 
&lt;body&gt; 
&lt;img src="imgcode.php" alt="看不清楚，换一张" align="absmiddle" style="cursor: pointer;" onclick="javascript:newgdcode(this,this.src);" /&gt; 
&lt;form method="POST" name="form1" action="image.php"&gt; 
&lt;input type="text" name="test"&gt; 
&lt;br /&gt; 
&lt;input type="submit" name="submit" value="提交"&gt; 
&lt;/form&gt; 
&lt;/body&gt; 
&lt;/head&gt; 
&lt;/html&gt;

Copy after login

The above is all the PHP code that can be refreshed by clicking on the verification code introduced to you. I hope it will be helpful to your study.

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