The derivation expression is actually to simplify some loop judgment operations, etc
How many ways can you generate a list of numbers 1-10?
>>> l = [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 ]
[1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
>>> l = 
>>> for x in range( 1, 11 ):
... l.append( x )
Posted by tinuviel on Thu, 02 Apr 2020 21:38:33 +0200
Title gate: http://www.lydsy.com/JudgeOnline/problem.php?id=4710
Topic analysis: at first, I didn't have a clue at all. Later, I found out that this is just like the second kind of stirling number?
First of all, consider how to do without the condition that everyone should take at least one specialty. Because different speci ...
Posted by Paulkirkewalker on Tue, 31 Mar 2020 19:10:03 +0200
With PHP7.4, there is an extension that I think is very useful: PHP FFI (Foreign Function interface), which refers to a description in PHP FFI RFC:
For PHP, FFI provides a way to write PHP extensions and bindings to C libraries in pure PHP.
Yes, FFI provides high-level languages to call each other directly. For PH ...
Posted by Johan Beijar on Mon, 30 Mar 2020 12:07:14 +0200
PHP Clean Code (Part I)
Use default parameters instead of short circuit operation or condition judgment
This is not good because $breweryName can be NULL
function createMicrobrewery($breweryName = 'Hipster Brew Co.'): void
This approach is easier to understand than the above, but it needs to contr ...
Posted by Kiubbo on Fri, 27 Mar 2020 11:33:02 +0100
Software Engineer Guidelines for Robert C.Martin's Clean Code The same applies to PHP.It is not a guide to coding style, it guides us to write readable, reusable, and decomposable code in PHP.
Not all guidelines must be strictly followed, even some have become common conventions.This is just a guideline, many of which are years of ex ...
Posted by Kalland on Fri, 27 Mar 2020 09:16:14 +0100
Posted by Demonic on Thu, 26 Mar 2020 04:11:33 +0100
Posted by scheols on Thu, 26 Mar 2020 03:33:25 +0100
Alida fish's latest download address: Alibig fish SDK Download Or download from the official website: Alibaba big fish SDK official website download
After downloading, put the API ﹣ SDK folder in the compressed package into the ThinkPHP\Library\Vendor directory, and change the file name to Aliyun. If you want to change it to another name, plea ...
Posted by Neomech on Fri, 20 Mar 2020 16:43:03 +0100
First, install RabbitMQ corresponding to PHP. Here we use PHP ﹣ AMQP to implement different extension methods with slight differences php extension address: http://pecl.php.net/package/amqp The details are subject to the official website http://www.rabbitmq.com/getstarted.html
config.php configuration information BaseMQ.php MQ base ...
Posted by poseidix on Tue, 17 Mar 2020 16:17:27 +0100
My personal website
Preparation before installation
yum install \
Download, unzip and install
tar -zxzf redis-4.0.8.tar.gz
make PREFIX=/usr/local/redis/ install
Create the data file ...
Posted by chrisv on Tue, 17 Mar 2020 12:24:00 +0100