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What is the most efficient/elegant way to parse a flat table into a tree?
Assume you have a flat table that stores an ordered tree hierarchy:
14 Answers
14
...
How can javascript upload a blob?
...fd.append('data', soundBlob);
$.ajax({
type: 'POST',
url: '/upload.php',
data: fd,
processData: false,
contentType: false
}).done(function(data) {
console.log(data);
});
You need to use the FormData API and set the jQuery.ajax's processData and contentType to false.
...
Difference between require, include, require_once and include_once?
In PHP:
25 Answers
25
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Get operating system info
...perating system info. I have not been able to find out how to do that with PHP, and wanted to try to figure it out.
7 Answe...
Which $_SERVER variables are safe?
...lett.org/blog/2006/mar/server-name-versus-http-host.
‡ See https://bugs.php.net/bug.php?id=64457, http://httpd.apache.org/docs/current/mod/core.html#usecanonicalphysicalport, http://httpd.apache.org/docs/2.4/mod/core.html#comment_999
Entirely arbitrary user controlled values
These values are no...
Deep Learning（深度学习）学习笔记整理系列之（三） - 大数据 & AI - 清泛...
...算单元情况下对复杂函数的表示能力有限，针对复杂分类问题其泛化能力受到一定制约。深度学习可通过学习一种深层非线性网络结构，实现复杂函数逼近，表征输入数据分布式表示，并展现了强大的从少数样本集中学习数据集...
第一个Hello,OS World操作系统 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...0
其中，主要的步骤代码中都有详尽的注释，如有任何问题，请移步至论坛《深入OS》板块发帖讨论。
编译执行过程：
打开dos窗口，进入源码所在目录，执行命令nasm boot.asm -o pfos.img：
同目录下生成一个"pfos.img"软盘映...
What is stdClass in PHP?
...
stdClass is PHP's generic empty class, kind of like Object in Java or object in Python (Edit: but not actually used as universal base class; thanks @Ciaran for pointing this out).
It is useful for anonymous objects, dynamic properties, ...
instantiate a class from a variable in PHP?
...r as I can tell) must declare the full namespace path of a class.
MyClass.php
namespace com\company\lib;
class MyClass {
}
index.php
namespace com\company\lib;
//Works fine
$i = new MyClass();
$cname = 'MyClass';
//Errors
//$i = new $cname;
//Works fine
$cname = "com\\company\\lib\\".$cname...
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...