From a PDO Statement, fetch all the results and store them in an associative array, mapping integer and float values to PHP int and float types. It reads the column metadata to read the value's type.

pdo-fetch-with-types.php

<?php

// Returns the contents of $stm (PDO Statement)
// as an associative array, with correct native types
// for integers, nulls, and floats

$array = [];

while ($fila = $stm->fetch(\PDO::FETCH_ASSOC)) {

    $i = 0;
    $columnMetas = [];

    while ($columnMeta = $stm->getColumnMeta($i)) {
        $columnMetas[$columnMeta['name']] = $columnMeta;
        $i++;
    }
   
    foreach ($fila as $key => $value) {
        if ($value === null) {
          continue;
        }
       
        $columnMeta = $columnMetas[$key];

        switch ($columnMeta['native_type']) {
            case 'LONG':
            case 'TINY':
                $fila[$key] = intval($value);
                break;
            case 'DOUBLE':
                $fila[$key] = floatval($value);
                break;
        }

        $i++;
    }

    $array[] = $fila;
}

return $array;
?>

Note: Tested in PHP 5.6 and MySQL 15.0 (10.0 MariaDB)