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php实现点击可刷新验证码

作者:用户 来源:互联网 时间:2017-12-01 11:23:35

验证

php实现点击可刷新验证码 - 摘要: 本文讲的是php实现点击可刷新验证码, 验证码类文件 CreateImg.class.php<?php class ValidationCode { private $width,$height,$codenum; public $checkcode; //产生的验


验证码类文件 CreateImg.class.php

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


包含文件 imgcode.php

<?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->outImg(); $_SESSION['validationcode'] = $image->checkcode; //存贮验证码到 $_SESSION 中 ?>


前台文件 demo.php

html;">?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'; } } ?>  <html> <head> <title>Image</title> <meta http-equiv="content-type" content="text/html;charset=utf-8"> <script language="javascript"> function newgdcode(obj,url) { obj.src = url+ '?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 } </script> <body> <img src="imgcode.php" alt="看不清楚,换一张" align="absmiddle" style="cursor: pointer;" onclick="javascript:newgdcode(this,this.src);" /> <form method="POST" name="form1" action="image.php"> <input type="text" name="test"> <br /> <input type="submit" name="submit" value="提交"> </form> </body> </head> </html>


以上就是为大家介绍的php点击验证码即可刷新的全部代码,希望对大家的学习有所帮助。php实现点击可刷新验证码

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