How to set the data can do the increment? - php

Question

May I know how to set the $n variable once I insert the data, $n will plus 1 to previous my insert number?
For similar example what I've tried:
$n = "AB000";
for ($n = 0; $n <= 0; $n++)
{
$query = "INSERT INTO [tablename] (user, country, batch_number) VALUES ('$user', '$country', $n)";
// execute query
}
I want the expect result can like below the table, every time I do the insert function, the batch number can auto add 1:
user | country| batch_number
John USA AB009
Lawn Germany AB010
Shawn England AB011
Hope someone can guide me how to solve this problem. Thanks.

Answer 1

What you think about this script.
This is a different approch to acheive
online fiddle: http://sandbox.onlinephpfunctions.com/code/569b6458b3080b4fa5c5f3d96bd0839334b02e8b
<?php
$n = "A00";
$user = "userName";
$country = "country";
for ($i=0; $i < 10; $i++) {
$batch = "";
$batch = $n."".$i;
echo "INSERT INTO tablename (user, country, batch_number) VALUE "."('".$user."', '".$country."', $batch)";
echo "\n";
}
?>

Answer 2

You could create a get_batch_number function which needs:
$number (in your case $n)
$prefix (in your case 'AB')
$pad_length (in your case 3)
for ($n = 0; $n <= $max_n; $n++) {
$batch_number = get_batch_number($n, 'AB', 3);
// ...
}
function get_batch_number($number, $prefix, $pad_length) {
return $prefix . str_pad($number, $pad_length, '0', STR_PAD_LEFT);
}