PHP生成图片验证码功能示例_PHP教程

PHP生成图片验证码功能示例

2021-04-14 16:07lx_3278@126 PHP教程

这篇文章主要介绍了PHP生成图片验证码功能,结合实例形式简单介绍了php生成验证码图片的操作技巧,具有一定参考借鉴价值,需要的朋友可以参考下

本文实例讲述了PHP生成图片验证码功能。分享给大家供大家参考，具体如下：

只是简单的用随机函数实现了图片的生成，没有对验证的整个流程做介绍。

代码如下：

									<?php

									/**

									 * Created by JetBrains PhpStorm.

									 * User: lee

									 * To change this template use File | Settings | File Templates.

									 */

									header("content-type:image/png");

									$validateLength=4;

									$strToDraw="";

									$chars=[

									  "0","1","2","3","4",

									  "5","6","7","8","9",

									  "a","b","c","d","e","f","g",

									  "h","i","j","k","l","m","n",

									  "o","p","q","r","s","t",

									  "u","v","w","x","y","z",

									  "A","B","C","D","E","F","G",

									  "H","I","J","K","L","M","N",

									  "O","P","Q","R","S","T",

									  "U","V","W","X","Y","Z"

									];

									$imgW=80;

									$imgH=25;

									$imgRes=imagecreate($imgW,$imgH);

									$imgColor=imagecolorallocate($imgRes,255,255,100);

									$color=imagecolorallocate($imgRes,0,0,0);

									for($i=0;$i<$validateLength;$i++){

									  $rand=rand(1,58);

									  $strToDraw=$strToDraw." ".$chars[$rand];

									}

									imagestring($imgRes,5,0,5,$strToDraw,$color);

									for($i=0;$i<100;$i++){

									  imagesetpixel($imgRes,rand(0,$imgW),rand(0,$imgH),$color);

									}

									imagepng($imgRes);

									imagedestroy($imgRes);