Incrementing a string by one in PHP - php

Question

I am struggling to find a way to increment a specific pattern required. For each new member, they are given a unique ID such as ABC000001. Each new members ID should increment by one. So the second member's ID would be ABC000002. I am using PHP and MySQL to keep track of each member but I have not been able to come up with a way to properly increment using the string format above.
What is the best way to approach this?

Answer 1

As #axiac mentions this is probably not a good idea but it's pretty easy to manage.
$memberid = 'ABC000001';
list($mem_prefix,$mem_num) = sscanf($memberid,"%[A-Za-z]%[0-9]");
echo $mem_prefix . str_pad($mem_num + 1,6,'0',STR_PAD_LEFT);
Split your current member number into the alpha and numeric parts then put them back together bumping the number when you do it. I use this as a function and pass the previous ID and what I get back is the next ID in the sequence.

Answer 2

You can extract only digits using regex to increment and using str_pad for create a prefix :
$memberid = 'ABC000001';
$num = preg_replace('/\D/', '',$memberid);
echo sprintf('ABC%s', str_pad($num + 1, "6", "0", STR_PAD_LEFT));

Answer 3

Possible answer without regex.
Runs through each character and checks if it is a number or not.
Then uses sprintf() to make sure leading 0s are still there.
$str = "ABC000001";
$number = "";
$prefix = "";
$strArray = str_split($str);
foreach ($strArray as $char) {
if (is_numeric($char)) {
$number .= $char;
} else {
$prefix .= $char;
}
}
$length = strlen($number);
$number = sprintf('%0' . $length . 'd', $number + 1);
echo $prefix . $number;
This works for this instance but would not work if the prefix had numbers in it.

Answer 4

just use the PHP increment operator ++
as long as you've sufficient leading zeros in the pattern, then PHP will correctly increment the numeric component
This code:
<?php
$name = 'ABC0000098';
print ++$name . PHP_EOL;
print ++$name . PHP_EOL;
print ++$name . PHP_EOL;
Outputs:
ABC0000099
ABC0000100
ABC0000101
Read more in the PHP docs:
https://www.php.net/manual/en/language.operators.increment.php
aha - just saw there is already a link to a similar example in the comment posted by "axiac" above