本文实例讲述了php实现的验证码文件类，具体如下：
<?php/*** @file* @version 1.0* @author 网海浪子* @brief 验证码文件类**/class ccheckcodefile{//验证码位数private $mcheckcodenum = 4;//产生的验证码private $mcheckcode = '';//验证码的图片private $mcheckimage = '';//干扰像素private $mdisturbcolor = '';//验证码的图片宽度private $mcheckimagewidth = '80';//验证码的图片宽度private $mcheckimageheight = '20';/**** @brief 输出头**/private function outfileheader(){ header ("content-type: image/png");}/**** @brief 产生验证码**/private function createcheckcode(){ $this->mcheckcode = strtoupper(substr(md5(rand()),0,$this->mcheckcodenum)); return $this->mcheckcode;} /**** @brief 产生验证码图片**/private function createimage(){ $this->mcheckimage = @imagecreate ($this->mcheckimagewidth,$this->mcheckimageheight); imagecolorallocate ($this->mcheckimage, 200, 200, 200); return $this->mcheckimage;}/**** @brief 设置图片的干扰像素**/private function setdisturbcolor(){ for ($i=0;$i<=128;$i++) { $this->mdisturbcolor = imagecolorallocate ($this->mcheckimage, rand(0,255), rand(0,255), rand(0,255)); imagesetpixel($this->mcheckimage,rand(2,128),rand(2,38),$this->mdisturbcolor); }}/**** @brief 设置验证码图片的大小** @param $width 宽** @param $height 高**/public function setcheckimagewh($width,$height){ if($width==''||$height=='')return false; $this->mcheckimagewidth = $width; $this->mcheckimageheight = $height; return true;}/**** @brief 在验证码图片上逐个画上验证码**/private function writecheckcodetoimage(){ for ($i=0;$i<=$this->mcheckcodenum;$i++) { $bg_color = imagecolorallocate ($this->mcheckimage, rand(0,255), rand(0,128), rand(0,255)); $x = floor($this->mcheckimagewidth/$this->mcheckcodenum)*$i; $y = rand(0,$this->mcheckimageheight-15); imagechar ($this->mcheckimage, 5, $x, $y, $this->mcheckcode[$i], $bg_color); }}/**** @brief 输出验证码图片**/public function outcheckimage(){ $this ->outfileheader(); $this ->createcheckcode(); $this ->createimage(); $this ->setdisturbcolor(); $this ->writecheckcodetoimage(); imagepng($this->mcheckimage); imagedestroy($this->mcheckimage);}}$c_check_code_image = new ccheckcodefile();//$c_check_code_image ->setcheckimagewh(100,50);//设置显示验证码图片的尺寸$c_check_code_image ->outcheckimage();?>
总结：以上就是本篇文的全部内容，希望能对大家的学习有所帮助。
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以上就是php生成验证码文件的方法的详细内容。