What does 'int(11)' mean in web programming tutorials and how does it differ from other variations like 'int(10)' or 'int(4)'?

Understanding int(11) vs. int(Anything Else)

While exploring web programming tutorials, the concept of int(11) and its variations (int(10), int(4), etc.) can raise questions. Originally, int(11) represents a maximum display width of 11 characters for integers, unless specified as UNSIGNED (in which case it defaults to 10). However, other values may be encountered in different tutorials, leaving you wondering about their purpose.

Unlike space requirements or performance considerations, the x in INT(x) specifically refers to the display width. By reducing this width, tutorials aim to achieve a "ZEROFILL" option for UNSIGNED integers. This option ensures that values are left-padded with zeros to the specified display width.

For example, consider the following:

INT(4) UNSIGNED ZEROFILL

Value	Result
1	0001
2	0002
99	0099
1000	0100
10000	1000

INT(2) UNSIGNED ZEROFILL

Value	Result
1	01
2	02
9	09
10	10
100	10

In contrast, without the ZEROFILL option, values will be left-padded with spaces:

INT(4)

Value	Result
1	1
2	2
99	99
1000	1000
10000	10000

INT(2)

Value	Result
1	1
2	2
9	9
10	10
100	10

By adjusting the display width, tutorials demonstrate the use of the ZEROFILL option to enhance the formatting and presentation of unsigned integer values.

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