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Creating PHP class instance with a string
...\Bar\MyClass';
$instance = new $class();
Other cool stuff you can do in php are:
Variable variables:
$personCount = 123;
$varname = 'personCount';
echo $$varname; // echo's 123
And variable functions & methods.
$func = 'my_function';
$func('param1'); // calls my_function('param1');
$meth...
App Inventor 2 经典蓝牙(SPP) 硬件接入：hc05 · App Inventor 2 中文网
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HC05 简单介绍
基本接入代码参考
常见问题解决
Error 515: Not connected to a Bluetooth device.
Error 507: unable to connect. is the device turned on?
乱码问题排查思路
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经典蓝...
PHP - Move a file into a different folder on the server
... they no longer want them. I was previously using the unlink function in PHP but have since been told that this can be quite risky and a security issue. (Previous code below:)
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Quora如何在快速开发中保持高品质代码 - 项目管理 - 清泛网 - 专注C/C++及内核技术
...们的审查标准有别。如果潜在的漏洞/错误会造成严重的问题，代价高昂，我们就会改变平时的提交后审查流程，转为提交前审查。典型情况包括：
触及用户隐私和匿名的代码
触及影响大量其他代码的核心抽象
触及基础结构...
How do I load a PHP file into a variable?
I need to load a PHP file into a variable. Like include();
8 Answers
8
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企业级负载平衡简介 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...位读者在评论中提出了如果整个过程速度比较慢登陆会有问题这样一条评论...在之前的一篇文章《放好你的密码 - 从芝麻金融被攻破说起》中，一位读者在评论中提出了“如果整个过程速度比较慢登陆会有问题”这样一条评论。...
What is the use of the @ symbol in PHP?
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It suppresses error messages — see Error Control Operators in the PHP manual.
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Performance of foreach, array_map with lambda and array_map with static function
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FWIW, I just did the benchmark since poster didn't do it. Running on PHP 5.3.10 + XDebug.
UPDATE 2015-01-22 compare with mcfedr's answer below for additional results without XDebug and a more recent PHP version.
function lap($func) {
$t0 = microtime(1);
$numbers = range(0, 1000000);
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How do you use bcrypt for hashing passwords in PHP?
Every now and then I hear the advice "Use bcrypt for storing passwords in PHP, bcrypt rules".
11 Answers
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List of Big-O for PHP functions
After using PHP for a while now, I've noticed that not all built-in PHP functions are as fast as expected. Consider these two possible implementations of a function that finds if a number is prime using a cached array of primes.
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