Append a number to every php instance [closed] - php

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I have a form in my website where users can send messages to multiple recipients, they type in the recipient's numbers separated by commas, I recieve the numbers in my php script as a single post variable, but I need to add the recipient,s area code on front of every number, I have tried to explode the variable using the comma as a separator but I do not know what to do from there
$recipient=$_POST['recipient'];
$numbers=explode(',' $recipient);
for ($i = 0; $i <=sizeof($numbers); $i++) {
}

Answer 1

I do not know how you're getting the area codes in the script, but to prepend the number with the area code, you can just use string concatenation, like so:
$areacode = 123; // this is received dynamically
$result = array(); // initialize empty array
for ($i = 0; $i <= sizeof($numbers); $i++) {
$result[] = $areacode . '_' . $numbers[$i];
}
This can also be done using a foreach:
foreach (explode(',', $recipient) as $number) {
$result[] = $areacode . '_' . $number;
}
Now, if you want to get this back as a comma-separated string, you can use implode(), like so:
$result_string = implode(',', $result);

Answer 2

The short answer is something like:
$numbers_with_area_codes = Array();
for ($i = 0; $i <= sizeof($numbers); $i++) {
$numbers_with_area_codes[] = '+372'.$numbers[$i];
}