Make 4 digit integer from one, two, or three digits integer in PHP

Question

I'am doing a call to a database to retrieve an ID of a specific item. Usually there are the ids like: 1, 2, 14, 23, ... . I need to get the ID from a DB and output it 4 digit number.

For exemple: My result ID is: 1 . Now i when i have this value, i want it to become 0001 . Or if my result id is 13 , it should became 0013 , etc.

How can i achieve that with php without changing the real ID in database?

Answer 1

You want to zerofill an integer.

You could either do sprintf('%04u', $n) or str_pad($n, 4, '0', STR_PAD_LEFT) .

Answer 2

一直如此。

sprintf("%04d", $num)

Answer 3

You want the PHP strpad function:

<?php
$input = 1;
echo str_pad($input, 4, "0", STR_PAD_LEFT);  // produces "0001"
?>

Answer 4

如果你想在MySQL查询中做到这一点，就在这里

SELECT LPAD(id, 4, '0') as modified_id FROM table;