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array An array in php is an ordered mapping, a type that associates values to keys, and an array can accept any number of key-value pairs separated by commas. Introduction to arrays /* * Arrays in php can be divided into: *Index Array: Subscript is a number *Associated Array: Subscript is string *Note: Arrays in php don't really distinguish ...

Alibaba cloud's one click deployment script is used for deployment: curl -fsSL https://get.docker.com | bash -s docker --mirror Aliyun Create the required directory: mkdir -p /etc/docker /data/docker Then modify the configuration file of docker: /etc/docker/daemon.json {   "graph": "/data/docker",   "storage-driver": "overlay2",   "insecure-re ...

Original link: Tcpdump sample tutorial The main content of this paper is translated from <Tcpdump Examples>. Tcpdump is a powerful network packet capturing tool. It uses libpcap library to grab network packets, which is found in almost all Linux/Unix. Familiar with the use of tcpdump can help you to analyze and debug network data. Th ...

web 1.web2 Check the source code, Firefox f12, viewer. 2. calculator f12 viewer, find the following line: <input type="text" class="input" maxlength="1"> Change maxlength to the number of digit ratio results, and you can enter it. 3.web foundation $ This is really the foundation. When get reques ...

This year's epidemic led to the late start of school. I want to learn and use javafx freely in my self-study at home, so I am going to write a calculator. First, the results are presented, and then the code is analyzed. Here's the source code: package ff; import java.util.Collections; import java.util. ...

Article directory 1, GET request blind annotation 1. Introduction to blind note Introduction to blind notes Types of blindness 2.GET blind injection based on time Principle overview Determine whether there is injection point Judge database length Judge database name 3.GET blind annotation based ...

Number Number Number In python's documentation, there are several points to note: The Math module does not support functions of complex numbers, which are calculated using cmath.So most of them don't support complex numbers. Under the math module, floating-point numbers are returned unless the label ...

51 Single-chip computer-lcd1602 driver This paper describes and summarizes the driver of 51 single-chip computer external lcd1602. The clock circuit of 51 single-chip computer uses 12MHz crystal oscillation, P0 port external pull-up resistance is connected with LCD1602 data port D0-D7, P2.7 and LCD160 ...

Last time we said some simple questions, today we will look at some questions about strings. First question Analysis: Prompt the user to enter the password first (String password) Pass the password into boolean isValid(password) and the return value is true, which is legal; the return value is ...

Catalog Click here to view all posts I. Preface In the last blog, we talked about initializing GPIO as an output function to drive LED s or other peripherals. In this blog, we will continue to talk about the other remaining function of GPIO - input function Since it is a smart device, it needs to i ...