PHP基础-如何实现验证码-白红宇

PHP基础-如何实现验证码

阅读量：313 次

发布时间：2019-03-03

本文共 252 字，大约阅读时间需要 1 分钟。

生成随机字符串并创建带有随机背景和点的图片

为了验证用户身份，以下脚本会生成一个4位随机字符串。这个字符串主要由数字和字母组成，并通过PHP sessions变量存储。随后，脚本将创建一张指定大小的图片，并为图片设置随机的背景颜色和分布的点。

脚本的具体实现步骤如下：

初始化PHP sessions变量

定义字符集合，包含数字和部分字母

生成4位随机字符串

创建指定大小的图片资源

为图片设置随机的背景颜色

在图片中随机分布多个点

整个过程通过PHP函数实现，确保图片生成时背景颜色和点的分布均匀随机。

转载地址：http://fprm.baihongyu.com/

你可能感兴趣的文章

NN&DL4.8 What does this have to do with the brain?

nnU-Net 终极指南

No 'Access-Control-Allow-Origin' header is present on the requested resource.

NO 157 去掉禅道访问地址中的zentao

no available service ‘default‘ found, please make sure registry config corre seata

No compiler is provided in this environment. Perhaps you are running on a JRE rather than a JDK?

no connection could be made because the target machine actively refused it.问题解决

No Datastore Session bound to thread, and configuration does not allow creation of non-transactional

No fallbackFactory instance of type class com.ruoyi---SpringCloud Alibaba_若依微服务框架改造---工作笔记005

No Feign Client for loadBalancing defined. Did you forget to include spring-cloud-starter-loadbalanc

No mapping found for HTTP request with URI [/...] in DispatcherServlet with name ...的解决方法

No mapping found for HTTP request with URI [/logout.do] in DispatcherServlet with name 'springmvc'

No module named 'crispy_forms'等使用pycharm开发

No module named cv2

No module named tensorboard.main在安装tensorboardX的时候遇到的问题

No module named ‘MySQLdb‘错误解决No module named ‘MySQLdb‘错误解决

No new migrations found. Your system is up-to-date.

No qualifying bean of type XXX found for dependency XXX.

No qualifying bean of type ‘com.netflix.discovery.AbstractDiscoveryClientOptionalArgs＜?＞‘ available

No resource identifier found for attribute 'srcCompat' in package的解决办法