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PHP生成图片验证码功能示例

时间：2020-12-04 22:28 编辑：来源：阅读：
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摘要：PHP生成图片验证码功能示例

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);

运行效果如下： [img]http://files.jb51.net/file_images/article/201701/2017112113712438.png?2017012113745[/img] [b]PS：这里再为大家推荐几款比较实用的图片处理工具供大家参考使用：[/b] [b]在线图片转换BASE64工具： [/b][url=http://tools.jb51.net/transcoding/img2base64]http://tools.jb51.net/transcoding/img2base64[/url] [b]ICO图标在线生成工具： [/b][url=http://tools.jb51.net/aideddesign/ico_img]http://tools.jb51.net/aideddesign/ico_img[/url] [b]在线Email邮箱图标制作工具： [/b][url=http://tools.jb51.net/email/emaillogo]http://tools.jb51.net/email/emaillogo[/url] [b]在线图片格式转换(jpg/bmp/gif/png)工具： [/b][url=http://tools.jb51.net/aideddesign/picext]http://tools.jb51.net/aideddesign/picext[/url] 更多关于PHP相关内容感兴趣的读者可查看本站专题：《[url=http://www.1sucai.cn/Special/455.htm]PHP图形与图片操作技巧汇总[/url]》、《[url=http://www.1sucai.cn/Special/348.htm]PHP基本语法入门教程[/url]》、《[url=http://www.1sucai.cn/Special/357.htm]PHP运算与运算符用法总结[/url]》、《[url=http://www.1sucai.cn/Special/43.htm]php面向对象程序设计入门教程[/url]》、《[url=http://www.1sucai.cn/Special/495.htm]PHP网络编程技巧总结[/url]》、《[url=http://www.1sucai.cn/Special/623.htm]PHP数组(Array)操作技巧大全[/url]》、《[url=http://www.1sucai.cn/Special/47.htm]php字符串(string)用法总结[/url]》、《[url=http://www.1sucai.cn/Special/84.htm]php+mysql数据库操作入门教程[/url]》及《[url=http://www.1sucai.cn/Special/231.htm]php常见数据库操作技巧汇总[/url]》希望本文所述对大家PHP程序设计有所帮助。

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