PHP add counter to name if already exists in array - php

Question

I have the following multi-dimensional array and I need to iterate over it and wherever there is a duplicate name, a counter is added to the name.
[1] => Array
(
[0] => Array
(
[clientName] => John Smith
[clientType] => 0
[clientDOB] => 1980-10-14
)
)
[2] => Array
(
[0] => Array
(
[clientName] => John Smith
[clientType] => 0
[clientDOB] => 1970-01-01
)
[1] => Array
(
[clientName] => Jeremy White
[clientType] => 2
[clientDOB] => 2015-08-19
)
)
The code I'm using is this :
$finalNames = array_map(function ($item) use (&$namesCount) {
if (!isset($namesCount[$item['clientName']])) {
$namesCount[$item['clientName']] = 0;
}
$namesCount[$item['clientName']]++;
$item['clientName'] = $item['clientName'] . ' ' . $namesCount[$item['clientName']];
return $item;
}, $arrayOfTravellers);
array_map(function($item, $key) use ($namesCount, &$finalNames) {
$finalNames[$key]['clientName'] = $namesCount[$item['clientName']] == 1
? str_replace(' 1', '', $finalNames[$key]['clientName'])
: $finalNames[$key]['clientName'];
}, $arrayOfNames, array_keys($arrayOfTravellers));
Which is returning a bunch of errors such as :
Notice: Undefined index: clientName in /Applications/MAMP/htdocs/europatours/functions/reportsFunctions.php on line 330
My assumption is that the code is not fit for a multi-dimensional array. Can anyone help please? I need to retain the complete structure of the array only where there is a duplicate name, a counter is added such as John Smith 1, John Smith 2 whereas Jeremy White remains without a counter.

Answer 1

$arrayOfNames = array(
array('clientName' => 'John'),
array('clientName' => 'John'),
array('clientName' => 'Mary'),
array('clientName' => 'Mary'),
array('clientName' => 'Mary'),
array('clientName' => 'Tony'),
array('clientName' => 'Alex')
);
$namesCount = array();
$finalNames = array_map(function ($item) use (&$namesCount) {
if (!isset($namesCount[$item['clientName']])) {
$namesCount[$item['clientName']] = 0;
}
$namesCount[$item['clientName']]++;
$item['clientName'] = $item['clientName'] . ' ' . $namesCount[$item['clientName']];
return $item;
}, $arrayOfNames);
array_map(function($item, $key) use ($namesCount, &$finalNames) {
$finalNames[$key]['clientName'] = $namesCount[$item['clientName']] == 1
? str_replace(' 1', '', $finalNames[$key]['clientName'])
: $finalNames[$key]['clientName'];
}, $arrayOfNames, array_keys($arrayOfNames));
echo '<pre>';
var_dump($finalNames);
echo '</pre>';
The output would be:
array(7) {
[0]=>
array(1) {
["clientName"]=>
string(6) "John 1"
}
[1]=>
array(1) {
["clientName"]=>
string(6) "John 2"
}
[2]=>
array(1) {
["clientName"]=>
string(6) "Mary 1"
}
[3]=>
array(1) {
["clientName"]=>
string(6) "Mary 2"
}
[4]=>
array(1) {
["clientName"]=>
string(6) "Mary 3"
}
[5]=>
array(1) {
["clientName"]=>
string(4) "Tony"
}
[6]=>
array(1) {
["clientName"]=>
string(4) "Alex"
}
}

Answer 2

What about a combination of array_column and in_array when adding new values?
$records = array(); // your data
$name = 'John';
$i = 0;
do
{
$newName = $name . ( ($i == 0)? '' : ' '.$i );
$i++;
}
while (in_array($newName, array_column($records, 'clientName')));
$records[] = array('clientName' => $newName);
Due to performance issues you may want to call array_columns only once before the loop and store the results in a variable.