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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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AsciiConversion 拓展问题：字母开头的会出现“C2”非预期字符 - App Inven...
做TCP通讯时遇到的问题，主要问题是：列表如果是字母开头就会出问题
发送这个列表
字母开头的都有这个问题，文本显示没有问题。
上面那个是程序 ，下面这个是测试工具
测试了一下：
1、ClientSocket拓展默认...
PHP Fatal error: Cannot redeclare class
...x situation). The include_once tip helps to clarify an obscure feature of PHP.
– DavidHyogo
Mar 20 '13 at 2:12
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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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How do PHP sessions work? (not “how are they used?”)
...when his session is created.
it is stored in a cookie (called, by default, PHPSESSID)
that cookie is sent by the browser to the server with each request
the server (PHP) uses that cookie, containing the session_id, to know which file corresponds to that user.
The data in the sessions files is the ...
Linux下部署企业级邮件服务器(postfix + dovecot + extmail) - 开源 & Gith...
...ail解决方案搭建邮件服务器全攻略，以及搭建过程中常见问题的解决方法汇总。首先通过一幅图看看整个解决方案的原理：
当用户通过extmail登陆时，首先extmail先去通过mysql进行虚拟用户认证，当认证通过时，postfix通过Cyrus-SASL...
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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Converting string to Date and DateTime
... Sadly, this answer has too many upvotes for anyone to pay attention. It's all copy paste these days.
– N.B.
Apr 3 '18 at 20:54
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深入浅出计算机字符集编码 - C/C++ - 清泛网 - 专注C/C++及内核技术
...入浅出计算机字符集编码通过解决一个实际工作中的编码问题，深入研究调查了下计算机的字符编码原理，掌握编码的基本原理后，相关的问题都可轻松解决，希望能给大家带来一定帮助。问题缘由：前面页面编码方式统一为UTF...
How to do error logging in CodeIgniter (PHP)
... wouldn't be publicly accessible- but you'll never know. Make sure to have all of this precautions in place if you change the default application/logs directory.
– Vincent Edward Gedaria Binua
Jan 29 '15 at 2:56
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