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Install and enable redis extension in PHP 5.X on Windows

Redis is frequently used as a caching layer for web applications to improve its performance. In PHP 5.x, if one wants to use Redis, the redis extension needs to be installed and enabled first. This post will show how to install and enable redis extension on Windows with PHP 5.X. Basically there are two dlls to be downloaded: php_redis.dll and php_igbinary.dll. Below are detailed steps Go to http://windows.php.net/downloads/pecl/releases/redis/2.2.7/ and find the respective php_redis zip ma...

PHP,WINDOWS,REDIS,PHP 5.6 2021-07-11 03:52:18

Why (offset, limit) is slow in database select?

Starting from a problem Five years ago when I was working at Tencent, I found that MySQL request speed was very slow in the pagination scenario. With only 100,000 data, a select query on a single machine took about 2-3 seconds. I asked my mentor why, and he asked in return, "In an indexing scenario, what is the time complexity to get the nth largest number in MySQL?" The pursuit of the answer Confirming the scenario Assuming there is an index on the "status" column, a query like "select * from t...

SLOW,LIMIT,OFFSET,MYSQL 2023-03-12 05:21:02

Why Math.min() > Math.max() is true in JavaScript

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JAVASCRIPT,MATH.MIN(),MATH.MAX(),COMPARISON 2022-05-02 05:27:07

Encrypting and decrypting PGP file or text on MacOS

When doing data exchange among different parties, there is a frequent need of encrypting data or file and sending it to partner and asking partner to use corresponding key to decrypt the data or file. A famous way of exchanging data is using asymmetric keys where no secret key needs to be shared. One party can just use the public key shared by partner to encrypt the data and the other party uses the private key to decrypt the data. Today, we will introduce how to use PGP to encrypt and decrypt d...

PGP,GPG,ENCRYPTION,DECRYPTION,TUTORIAL 2020-10-29 05:06:09