北京园林的色彩大多为金黄或大红，色彩明丽。有时，在万绿丛中见一道飞檐，黄绿相间，相映成趣。大多数宫殿者哺着琉璃瓦，大红色的棱、柱过于庄重，而幽雅倒显得欠缺。也有例外的，潭拓寺的大殿都是由灰色方砖铺地，墙壁也都是灰暗的，同周围的景色浑然一体。 "苔痕上阶绿，草色入帘青 "，古朴淡雅，别具风采。
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：
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：
在线图片转换BASE64工具：
http://tools.haodaima.com/transcoding/img2base64
ICO图标在线生成工具：
http://tools.haodaima.com/aideddesign/ico_img
在线Email邮箱图标制作工具：
http://tools.haodaima.com/email/emaillogo
在线图片格式转换(jpg/bmp/gif/png)工具：
http://tools.haodaima.com/aideddesign/picext
希望本文所述对大家PHP程序设计有所帮助。
到此这篇关于PHP生成图片验证码功能示例就介绍到这了。人生就像迷宫，我们用上半生寻找入口，用下半生寻找出口。更多相关PHP生成图片验证码功能示例内容请查看相关栏目，小编编辑不易，再次感谢大家的支持！