Programmer Think

Preparation First of all, the related class libraries are queried, such as FPDF, zendPDF,TcPDF, etc. First of all, I chose FPDF first. It can be said that there is no problem except Chinese characters. Chinese characters are disorderly and there is no good solution after reading the latest version, so I have to give up. Later, I found TcPDF, ...

The article was forwarded from the professional Laravel developer community. Original link: https://learnku.com/laravel/t... as everyone knows, Laravel The function of inversion of control (IoC) / dependency injection (DI) is very powerful. Unfortunately, Official documents I didn't explain all of its functions in detail, so I decided to prac ...

Comparison of variable implementation and garbage collection with php 5 and php7 Variable implementation PHP variables are of weak type, which can represent integer, floating-point number, string and other types. PHP variables are represented by the structure zval PHP 5.* zval and zend_value structures struct _zval_struct { // structural morpho ...

Before Gorang40 lines of code to realize common process pool Today, I read the relevant documents of swoole and implemented one in PHP. Since swoole does not have the select of golang, the implementation is a little simple, but the practicability is OK, and the universality is realized through factory functions. swoole's official pool is for Re ...

Create a database first CREATE TABLE user (   id varchar(32) CHARACTER SET utf8 NOT NULL,   name varchar(50) CHARACTER SET utf8 DEFAULT NULL ,   dflag char(1) CHARACTER SET utf8 DEFAULT NULL ,   PRIMARY KEY (`id`) ) jdbc.properties configuration mysql.driver=com.mysql.jdbc.Driver mysql.url=jdbc:mysql://127.0.0.1:3306/qingmu?char ...

Simply put, observer mode is similar to the relationship between broadcasting station and radio. Multiple radios go to the same radio channel In a real business scenario, this can be the case. After the order is created successfully, the event is published. Then reduce inventory. Send SMS. Call wechat. Call logistics service. Wait for multiple ...

LNMP represents the web server architecture of Nginx+MySQL+PHP under Linux system. Linux is a kind of Unix computer operating system, which is the most popular free operating system. Representative versions include debian, centos, ubuntu, fedora, gentoo, etc. Nginx is a high-performance HTTP and reverse proxy server, and also an IMAP/POP3/SMTP ...

This paper Original link Click here to get Chinese document of Etherscan API (full version) The layout of the whole content is better, and readers are recommended to read it. Account Please refer to API related to account number and address and parameter description of interface Etherscan API conventions , not described separately in the docume ...

Dixstra algorithm Algorithm -- dixtra algorithmDijkstra's algorithm: find the fastest path, not the path with the least number of segments.The dixstral algorithm is used for graphs where each edge has associated numbers, which are called weights.A graph with weight is called a weighted graph, and a graph without weight is called an unweighted ...

At a glance, it's a dynamic picture (kouhu.jpg All of the above is false news... In fact, this problem is an obvious technical (xia) Qiao (gao) problem. We find that the number of questions is far less than the number of sides, which shows that some sides have always existed.. So we can do it offline. We can shrink the graph composed of the exi ...