PHP生成图片验证码功能详解

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

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&<strong style="color:transparent">本文来源gaodai#ma#com搞@@代~&码*网/</strong><strong>搞gaodaima代码</strong>lt;$validateLength;$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);

运行效果如下：

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