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MySQL: determine which database is selected?
After calling mysql_select_db to grab a database, is there any way to later output the name of the database that is currently selected? This seems very basic but I couldn't find anything on php.net or stackoverflow (all results are for "no database selected").
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string sanitizer for filename
...a whitelist of characters you are happy to be used? For example, you could allow just good ol' a-z, 0-9, _, and a single instance of a period (.). That's obviously more limiting than most filesystems, but should keep you safe.
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正则表达式 30 分钟入门教程 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...,所以本页排版比较混乱,推荐你到原处查看,看完了如果有问题,再到这里来提出.
一些要说的话：
如果你没有正则表达式的基础，请跟着教程“一步步来”。请不要大概地扫两眼就说看不懂——以这种态度我写成什么样你也看...
【拍照图片处理】Attempt to invoke virtual method 'boolean android.grap...
在做图片识别App的时候，选择相册图片没有问题，拍照后图片就报错：
Attempt to invoke virtual method 'boolean android.graphics.Bitmap.compress(android.graphics.Bitmap$CompressFormat, int, java.io.OutputStream)' on a null object reference
图片大致的处理流程是...
拍照时报错求助！ - App Inventor 2 中文网 - 清泛IT社区，为创新赋能！
...这回不报错了
那可能是初始化中某个代码块导致的报错问题了{:8_368:}App Inventor 2 发表于 2025-04-30 14:09
那可能是初始化中某个代码块导致的报错问题了
找到问题了，MQTT模块遇到报错时的程序里有个死循环，不过我好奇长...
How to encrypt/decrypt data in php?
I'm currently a student and I'm studying PHP, I'm trying to make a simple encrypt/decrypt of data in PHP. I made some online research and some of them were quite confusing(at least for me).
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逆向工程——二进制炸弹(CSAPP Project) - 操作系统(内核) - 清泛网 - 专注...
...个字符串。那么，找到这个内存地址中的字符串便能解决问题了。那么如何去寻找呢，于是乎我又翻看我的那几十页代码纸，企图人工计算出来。后来发现数据段的的值没有包含。终于，我开始想到了gdb这个工具。干嘛不在0x8048...
Android应用内存泄露分析、改善经验总结 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...可以梳理总结出来作为分享。
原则
  对于性能问题，分析和改善有必要遵循以下原则：
一切看数据说话，不能跟着感觉走，感觉哪有问题就去改，很有可能会适得其反；
性能优化是一个持续的过程，需要不断...
PHP - Move a file into a different folder on the server
I need to allow users on my website to delete their images off the server after they have uploaded them if they no longer want them. I was previously using the unlink function in PHP but have since been told that this can be quite risky and a security issue. (Previous code below:)
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图片轮播使用指导 · App Inventor 2 中文网
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图片轮播使用指导
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常见问题
搭建与测试
案例：动态管理本地与网络图片
属性、方法与事件速查
常见问题与验收
完整 .aia 源码与操作指导
应用图片轮播
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