arr_fields[]: a bigint
arr_fields[]: b bit

$fields = array(
            'a' => array(
                'type' => 'bigint',
            ),
            'b' => array(
                'type' => 'bit',
            )
);

$schema = array(
    'description' => t ('Contains a particular templates data inputted from the MyID Inputting System'),
    'fields' => $fields,
);

db_create_table('myid_template_' . $template_id, $schema);

foreach ($arr_fields as $value) {
    $arr = explode(' ' , $value);
    $fields[$arr[0]] = array('type' => $arr[1]);
}

$schema = array(
    'description' => t ('Contains a particular templates data inputted from the MyID Inputting System'),
    'fields' => $fields,
);

db_create_table('myid_template_' . $template_id, $schema);

<em class="placeholder">PDOException</em>: SQLSTATE[42601]: Syntax error:  7 ERROR:  syntax error at end of input
LINE 4: )
     ^: CREATE TABLE {myid_template_489} (
a ,
b
); Array
(
)
in <em class="placeholder">db_create_table()</em> (line <em class="placeholder">2720</em> of <em class="placeholder">C:xampphtdocsdrupal-7.34includesdatabasedatabase.inc</em>).

foreach ($arr_fields as $value) {
    $arr = explode(' ' , $value);
    $fields[$arr[0]] = array('type' => $arr[1]);
}