The difference between i and i_PHP Tutorial

The difference between i and i, the difference

1. Usage of i (take a= i, i=2 as an example)

First add the value of i 1 (i.e. i=i 1), and then assign it to variable a (i.e. a=i),

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

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

2. Usage of i (take a=i, i=2 as an example)

First Assign the i value to the variable a (that is, a=i), then add 1 to the i value (that is, i=i 1),

Then the final a value is equal to 2 and the i value is equal to 3.

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

3. i and i

a= i is equivalent to i, a=i

a=i is equivalent to a=i, i

4. When i and i are used alone, they are equivalent to i=i 1

If assigned to a new variable, i first Add 1 to the value of i, and assign i to the new variable first.