phpstudy installation and configuration

vscode installation and configuration

PHP operating principle and PHP documentation

How to output the running results

Variable concepts and naming conventions

How to dynamically create variables

Pass by value and pass by reference

mutable variable

Variable data type

Variable type conversion

variable scope

static private variables

Variable filter (1)

Variable filter (2)

Variable filter (3)

Definition and access of constants (1)

Constant definition and access (2)

Predefined constants and magic constants

constants in namespace

Commonly used operators (1)

Commonly used operators (2)

Commonly used operators (3)

Commonly used operators (4)

Branch structure of process control (2)

Branch structure of process control (1)

Loop structure of process control (1)

Loop structure of process control (2)