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@ 2022-06-29T11:31:45Z

<?php

$data = ['status.1', 'status.2', 'status.3',
         'country.244', 'country.24', 'country.845',
         'pm.4', 'pm.9', 'pm.6'];
         
$result = [];
foreach ($data as $value) {
    [$prefix, $result[$prefix][]] = sscanf($value, '%[^.].%d');
}
var_export($result);

Output
Performance
VLD
References
Branches

sscanf: documentation ( source)
var_export: documentation ( source)

preferences:dark modelive previewkey bindings

32.43 ms | 405 KiB | 5 Q