Differentiate between dynamic and manually assigned array keys - php

Question

I was looking for a way to shorten my code, and could not find the answer to this question.
In this sample array:
$addressData = array(
'Full Name',
'Address Line 1',
'Address Line 2',
30 => 'City/Town',
22 => 'Province/State/Region',
27 => 'Postal/ZIP code',
'Country',
);
The first three values will be assigned keys 0, 1, and 2, respectively. The last value (Country) will be assigned key 31.
When I walk through this array, is there any way that I can treat those manually assigned values in different manner than the automatically assigned values?
I can't find anything in the manual, but I thought the community might be able to help.
Edit for further clarification. This is not real code, but it explains what I hope to achieve:
foreach($addressData as $key => $value){
if(is_set_manually($key)){
$someValue = TRUE;
}
}

Answer 1

Not sure if i understand your question correctly, but if you want to fix sequence if it's broken you can do something like this:
<?php
$addressData = array(
'Full Name',
'Address Line 1',
'Address Line 2',
30 => 'City/Town',
22 => 'Province/State/Region',
27 => 'Postal/ZIP code',
'Country',
);
$result= [];
$first = 0;
foreach($addressData as $key=>$data){
if($key != $first && ($key > $first+1)){
$newkey = $first;
$result[$newkey] = $data;
}else{
$result[$key] = $data;
}
$first++;
}
print_r($result);
And new array $result looks like:
Array
(
[0] => Full Name
[1] => Address Line 1
[2] => Address Line 2
[3] => City/Town
[4] => Province/State/Region
[5] => Postal/ZIP code
[6] => Country
)

Answer 2

If you can assign array like following format may be helpful for your answer.
<?php
$addressData = array(
'Full Name',
'Address Line 1',
'Address Line 2',
array(30 => 'City/Town'),
array(22 => 'Province/State/Region'),
array(27 => 'Postal/ZIP code'),
'Country',
);
foreach($addressData as $key => $value){
if(is_array($value)){
echo 'Manually Key<br>';
} else {
echo 'Dynamic Key<br>';
}
}
?>