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。