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数据结构与本地数据库 04：从打包 JSON 读取知识卡片 · App Inventor 2 中文网
...入数 = 0
var 跳过数 = 0
foreach 项 in 数据 {
if isdict(项) {
var 问题 = dictget(项,"question","")
var 答案 = dictget(项,"answer","")
var 分类 = dictget(项,"category","未分类")
var 重复 = false
if trim(问题) != "" and trim(答案) != "" and not 重复 {
listadd(卡片,makedic...
PHP's array_map including keys
...
Here's my very simple, PHP 5.5-compatible solution:
function array_map_assoc(callable $f, array $a) {
return array_column(array_map($f, array_keys($a), $a), 1, 0);
}
The callable you supply should itself return an array with two values, i.e. r...
App Inventor 2 浮点数与字节转换教程 · App Inventor 2 中文网
...度值（2字节整数 × 10）
字节序（大小端）
常见问题
Q1: 转换后数值有误差？
Q2: 发送后MCU解析错误？
Q3: 有没有现成扩展？
总结
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概述
在串口通信、蓝牙通信中，...
PHP Session Fixation / Hijacking
I'm trying to understand more about PHP Session Fixation and hijacking and how to prevent these problems. I've been reading the following two articles on Chris Shiflett's website:
...
Use PHP to create, edit and delete crontab jobs?
Is it possible to use PHP to create, edit and delete crontab jobs?
12 Answers
12
...
What is the JavaScript equivalent of var_dump or print_r in PHP? [duplicate]
...ct in JavaScript (for debugging). Is there anything similar to var_dump in PHP?
9 Answers
...
PHP convert date format dd/mm/yyyy => yyyy-mm-dd [duplicate]
...cho date("Y-m-d", strtotime($var) );
EDIT I just tested it, and somehow, PHP doesn't work well with dd/mm/yyyy format. Here's another solution.
$var = '20/04/2012';
$date = str_replace('/', '-', $var);
echo date('Y-m-d', strtotime($date));
...
PHP array_filter with arguments
...
I am not a php savy, so maybe this is an obvious question, but how can you pass in an array to array_filter and still make it work? the documentation never talks about this, except for someone's comment.
– Nicola P...
In PHP, can you instantiate an object and call a method on the same line?
...
The feature you have asked for is available from PHP 5.4. Here is the list of new features in PHP 5.4:
http://php.net/manual/en/migration54.new-features.php
And the relevant part from the new features list:
Class member access on instantiation has been added, e.g. (ne...
C++并发编程（中文版） - 文档下载 - 清泛网 - 专注C/C++及内核技术
...28
第3章 在线程间共享数据… 29
3.1 线程之间共享数据的问题… 29
3.1.1 竞争条件… 31
3.1.2 避免有问题的竞争条件… 31
3.2 用互斥元保护共享数据… 32
3.2.1 使用C++中的互斥元… 32
3.2.2 用于保护共享数据的结构化代码… 33
3.2.3...