这篇文章主要介绍了php如何实现点击即可刷新验证码，代码很详细，值得大家学习，感兴趣的小伙伴们可以参考一下
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;$idisturbcolor = imagecolorallocate($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 ($i=0;$icodenum;$i++){$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'; } } ?>
image
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。