PHP integer type is an integer

I keep saying, don't be intimidated by the meaning of a noun.

What exactly is plastic surgery?

The so-called integer type is the integer that everyone learns in mathematics.

Integer type - Integer, also called in English: integer. English abbreviation: int

Integers are divided into:

1.10 base

2.8 base (understood, basically not used)

3.16 base (understood, basically not used)

Integers (integers) have maximum and minimum value ranges in computers.

[Understand knowledge points, not commonly used in development] We often hear that 32-bit computers, that is, the maximum range of a 32-bit computer for one operation is -2³²to 2³²-1 .
What about 64-bit computers? ——

Decimal declaration:

Octal declaration:starts with 0, followed by an integer from 0 to 7 (understand the knowledge points)

Hexadecimal declaration:Starts with 0x, followed by 0-f. The abcdef of 0x is not case-sensitive. (Learn about knowledge points)

The focus of this chapter is to learn how to declare a 10-system integer. It doesn't matter if you understand the declarations of octal and hexadecimal systems.

Thinking misunderstanding: It is easy to think about how the octal and hexadecimal systems came into being.