php实现点击可刷新验证码

php  /  管理员 发布于 7年前   241

本文实例为大家分享了php点击可刷新验证码的具体代码，供大家参考，具体内容如下

验证码类文件 CreateImg.class.php

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

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

前台文件 demo.php

?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'; } } ?>         
  
  
    

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。

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