> Example,
> A12B05C45D34
> 
> I need to split this into chunks of three A12,B05,C45..etc?

not sure if your string will always be the same patter but this might work

$string = 'A12B05C45D34';

$array = preg_split ( '/([a-zA-Z]\d{2})/', $string,
-1,PREG_SPLIT_NO_EMPTY | PREG_SPLIT_DELIM_CAPTURE );
print_r($array);

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