How to learn php efficiently

Variable type

Variable detection

Variable type judgment

Print debug variables

Variable type conversion

Assignment by value and assignment by reference

Destroy variables

dynamic variables

arithmetic operators

comparison operator

ternary operator

Logical Operators

increment decrement operator

String operators

assignment operator

switch case control structure

while loop

for loop

break与continue

Classic example of bridge crossing problem

Classic case: ninety-nine multiplication tables

Classic case: One hundred dollars to buy one hundred chickens problem

Function concept

function definition format

Function execution and return process

Function parameter passing method

function scope

Dynamically calling functions

timestamp function

Timestamp formatting

Date parsing function

String definition method

The difference between single and double quotes

Common string functions

Array declaration method

array type

Array key rules

Operate array unit

Traverse array

Array cursor operations

Common functions for arrays

Array case of lamb breeding

Super changing variables

Explanation of constant system

File introduction

Base and bit operations (Part 1)

Base and bit operations (Part 2)

php error reporting settings

Floating point numbers are not precise

Short-circuit characteristics of logic operations

Case file management system

recursive concept

Recursive tricks

staticstatic variable

Recursion exercises

IP domain name and DNS concepts

Apache installation and virtual host configuration

Apache integrates PHP

InstallMySQL

10 introductory statements for MySQL

Submit message to MySQL