Add 0 to the beginning of phone numbers Woocommerce - After receiving Order #ID

oodi 0
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I'm a php and wordpress newbie.
I have a woocommerce shop, where users are able to enter their phone number as [billing_phone] at woocommerce checkout page.
The mobile phones are 11 digits and they must include a ZERO at the beginning of it. Some users are adding the 0 to the beginning like 01234567891, while others simply do not.
What I want is to check the [billing_phone]s after the purchase process (after they recieve the Order #ID. and if it does not contain any 0 at the beginning add it automatically.

So if I go to Woocommerce> Orders> Order details> I should see an 11 digits with 0 under Billing> Phone number section.

I have read semi-related topics like Remove zero and understood that it can be done by using the preg_replace PHP functions. and came up with a solution like

add_action('woocommerce_checkout_process', 'AddZero');
function AddZero() {
if (isset($_POST['billing_phone']) && strlen['billing_phone'] == 10)) { //added lenght check to make sure if it's 10 digits
$_POST['billing_phone'] = preg_replace('/\0/', '', $_POST['billing_phone']);
// $_POST['billing_phone'] = preg_replace('\*0\', '', $_POST['billing_phone']); //not working
// $_POST['billing_phone'] = preg_replace('/^0/', '0', $_POST['billing_phone']); // not working
// $_POST['billing_phone'] = preg_replace('/*0*/', '', $_POST['billing_phone']); //not working
// $_POST['billing_phone'] = preg_replace('/$0\d{9}*/', '', $_POST['billing_phone']); //not working
 } }

then changed the if (isset($_POST['billing_phone']) && strlen['billing_phone'] == 10)) to if (!(preg_match('/[0-9]{10}*/', $_POST['billing_phone'] ))) nothing changed. And finally tried what I learned from regex basic tutorial

function AddZero() {
if (isset($_POST['billing_phone'])) {
$_POST['billing_phone'] = preg_replace('/^0/', '0', $_POST['billing_phone']); //the ^ will spot the first position of the given string, and then add 0 there.
    }
}

Not working either.

I don't know where I'm wrong, so any help is appreciated.
And please explain the answer if possible. I love to learn something new, not just using the given code.

preg-replace checkout woocommerce wordpress php
1 Answers

It would be very simple if there would never be a number with two zeros.
If there is a leading 0, trim it off.
Then concatenate a leading 0.

$_POST['billing_phone'] = '0' + ltrim($_POST['billing_phone'],0);

Or
Test for a leading zero and add one if it does not already have one.

if (substr($_POST['billing_phone'],0,1) != '0' ){$_POST['billing_phone'] = '0' . $_POST['billing_phone'];}

I'm not so sure about your && strlen['billing_phone'] == 10).
What do you do if the length is 10 and has a leading zero?
I would probably add the zero if necessary then test the length.

Misunderstood0
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