php - Add numbering to duplicate array items

I'm writing a script to increment values that are repeated in an array. For example, an array containing these 5 values:

Test
Testing
Test
Testing Again
Test

Should become:

Test
Testing
Test 1
Testing Again
Test 2

Here's what I have so far:

    $custom_fields = get_post_meta( $post_id, 'fields', false);
    $custom_field_occurences = [];

    foreach ($custom_fields as $key => $value) {

        if (!in_array($value, array_keys($custom_field_occurences))) {
            // First instance, doesn't need to be incremented,
            $custom_field_occurences[$value] = 0;
        } else {
            // Already exists, increment it by the number of occurences.
            $custom_field_occurences[$value]++;
            $incremented_value = $value . ' ' . $custom_field_occurences[$value];
            update_post_meta( $post_id, 'fields', $incremented_value, $value );
        }

    }

The problem I'm currently having is that the function turns the array into this:

Test 1
Testing
Test 1
Testing Again
Test 1

I have also tried this variation:

        foreach ($cleaned_custom_fields as $key => $value) {

            if (!in_array($value, array_keys($custom_field_occurences))) {
                // First instance, doesn't need to be incremented,
                $custom_field_occurences[$value] = 0;
            } else {
                // Already exists, increment it by the number of occurences.
                $custom_field_occurences[$value]++;
            }

            $incremented_value = $value . ' ' . $custom_field_occurences[$value];
            update_post_meta( $post_id, 'wpcf-logbook-text-fields', $incremented_value, $value );

        }

But that results in

Test 0
Testing 0
Test 0
Testing Again 0
Test 0

How can I ensure the function incrementally numbers the repeating values, making them unique?

Solution:

I am sure this will work

<?php  
$arrayName = array('Test','Testing','Test','Testing again','Test','Testing');

for($i=0;$i<count($arrayName);$i++){
    $c=1;
    for($j=$i+1;$j<count($arrayName);$j++){
        if($arrayName[$i]==$arrayName[$j]){
            $arrayName[$j].=$c;
            $c++;
        }
    }
}
for($i=0;$i<count($arrayName);$i++){
    echo $arrayName[$i].'<br>';
}
?>

Solution:

Solution ended up being this:

        $cleaned_custom_fields = get_post_meta( $post_id, 'fields', false);
        $incremented_fields = [];
        $field_occurences = [];

        foreach ($cleaned_custom_fields as $key => $value) {

            if (!in_array($value, array_keys($incremented_fields))) {
                // First instance, doesn't need to be incremented. Just push it 
                array_push($incremented_fields, $value);
                $field_occurences[$value] = 0;
            } else {
                // Already exists, increment it by the number of occurences.
                $field_occurences[$value]++;
                $incremented_value = $value . ' ' . $field_occurences[$value];
                array_push($incremented_fields, $incremented_value);
                update_post_meta( $post_id, 'fields', $incremented_value, $value );
            }

        }