How do alignment specifiers and width specifiers work with printf() and sprintf() in PHP?

I am studying about printf and sprintf and I don't understand a few points. Can someone please help me understand the following format specifiers explained at sprintf():

• An optional alignment specifier that says if the result should be left-justified or right-justified. The default is right-justified; a - character here will make it left-justified.

• An optional number, a width specifier that says how many characters (minimum) this conversion should result in.

width specifier:

given:    printf('|%5d|', 1);
prints:   |    1|
           ^^^^^-- 4 spaces + 1 char = width of 5

alignment:

given:    printf('|%-5d|', 1);
prints    |1    |
           ^^^^^-- 1 char + 4 right-justified spaces = width of 5.