The difference between ++i and i++, the difference _php tutorial

The difference between ++i and i++

1, the use of ++i (take A=++i, i=2 as an example)

The I value is first added to 1 (that is, i=i+1) and then assigned to the variable a (that is, a=i),

Then the final a value is equal to 3, and the I value equals 3.

So a=++i equivalent to i=i+1, a=i

2, the use of i++ (take a=i++, i=2 as an example)

First assign the I value to the variable a (that is, a=i), then I value 1 (that is, i=i+1),

Then the final a value is equal to 2, and the I value equals 3.

So a=i++ equivalent to A=i, i=i+1

3, ++i and i++

A=++i equivalent to i++, a=i

a=i++ equivalent to A=i, i++

4, ++i and i++ when used alone, equivalent to I=i+1

If you assign a new variable, the ++i first assigns the I value to 1 and the i++ first to the new variable.

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