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Best way to test for a variable's existence in PHP; isset() is clearly broken
...f isset().
Since this is takes the array to check as a function argument, PHP will still raise "notices" if the array itself doesn't exist. In some cases, it can validly be argued that each dimension should have been initialised first, so the notice is doing its job. For other cases, a "recursive" ...
What's wrong with using $_REQUEST[]?
...to the much more sensible GP (no C) order with the request_order config in PHP 5.3. Where this is not possible, I personally would avoid $_REQUEST and, if I needed a combined GET+POST array, create it manually.
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What is the difference between is_a and instanceof?
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Update
As of PHP 5.3.9, the functionality of is_a() has changed. The original answer below states that is_a() must accept an Object as the first argument, but PHP versions >= 5.3.9 now accept an optional third boolean argument $allow_s...
How can I store my users' passwords safely?
... MD5 ? I've just started looking into password security. I'm pretty new to PHP.
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Memcached vs APC which one should I choose? [closed]
...lways use an opcode cache, which APC is (also APC will get integrated into php6 iirc, so why not start using it now).
You can/should use both for different purposes.
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Converting a UNIX Timestamp to Formatted Date String
Using PHP, I want to convert UNIX timestamps to date strings similar to this: 2008-07-17T09:24:17Z
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Single vs Double quotes (' vs ")
...b Development often consists of many programming languages. HTML, JS, CSS, PHP, ASP, RoR, Python, ect. Because of this we have many syntax conventions for different programing languages. Often habbits from one language will follow us to other languages, even if it is not considered "proper" i.e. com...
How to set my phpmyadmin user session to not time out so quickly? [duplicate]
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To increase the phpMyAdmin Session Timeout, open config.inc.php in the root phpMyAdmin directory and add this setting (anywhere).
$cfg['LoginCookieValidity'] = <your_new_timeout>;
Where <your_new_timeout> is some number larger...
Can JavaScript connect with MySQL?
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No, JavaScript can not directly connect to MySQL. But you can mix JS with PHP to do so.
JavaScript is a client-side language and your MySQL database is going to be running on a server
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BLE 低功耗蓝牙调试助手：扫描、连接、读写、订阅通知（附 .aia 源码） · ...
...（解决乱码）
十六进制文本转字节发送
常见问题
用到的组件
验证范围
BLE 调试助手：一个 App 完成低功耗蓝牙的扫描、连接、选特征、读取、订阅通知和发送，收到的每一包同时显示十六进制和 UTF-8 文本。
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