PHP组mysql由两列选择

我在MySQL中有这个表：

我想按浏览器和版本对选择结果进行分组

想要的输出：

Array
(
    [firefox 3.0] => 2
    [chrome 24.0] => 1
    [ie 9.0] => 2
    [ie 10.0] => 1
)

public function get_browsers() {
    $query = "
        SELECT browser, COUNT(browser) AS num 
        FROM table
        GROUP BY browser 
        ORDER BY browser ASC
        ";
    $select = mysqli_query($this->c, $query);
    while ($row = mysqli_fetch_array($select)) {
        $data[$row['browser']] = (int) $row['num'];
    }
    return $data;
}

Array
(
    [firefox] => 2
    [chrome] => 1
    [ie] => 3
)

问题：如何分组选择以获得想要的输出

注意：表可以包含更多版本的浏览器，所以数组将扩展

我的尝试：

Array
(
    [firefox 3.0] => 2
    [chrome 24.0] => 1
    [ie 9.0] => 2
    [ie 10.0] => 1
)

public function get_browsers() {
    $query = "
        SELECT browser, COUNT(browser) AS num 
        FROM table
        GROUP BY browser 
        ORDER BY browser ASC
        ";
    $select = mysqli_query($this->c, $query);
    while ($row = mysqli_fetch_array($select)) {
        $data[$row['browser']] = (int) $row['num'];
    }
    return $data;
}

Array
(
    [firefox] => 2
    [chrome] => 1
    [ie] => 3
)

PHP:

Array
(
    [firefox 3.0] => 2
    [chrome 24.0] => 1
    [ie 9.0] => 2
    [ie 10.0] => 1
)

public function get_browsers() {
    $query = "
        SELECT browser, COUNT(browser) AS num 
        FROM table
        GROUP BY browser 
        ORDER BY browser ASC
        ";
    $select = mysqli_query($this->c, $query);
    while ($row = mysqli_fetch_array($select)) {
        $data[$row['browser']] = (int) $row['num'];
    }
    return $data;
}

Array
(
    [firefox] => 2
    [chrome] => 1
    [ie] => 3
)

电流输出：

Array
(
    [firefox 3.0] => 2
    [chrome 24.0] => 1
    [ie 9.0] => 2
    [ie 10.0] => 1
)

public function get_browsers() {
    $query = "
        SELECT browser, COUNT(browser) AS num 
        FROM table
        GROUP BY browser 
        ORDER BY browser ASC
        ";
    $select = mysqli_query($this->c, $query);
    while ($row = mysqli_fetch_array($select)) {
        $data[$row['browser']] = (int) $row['num'];
    }
    return $data;
}

Array
(
    [firefox] => 2
    [chrome] => 1
    [ie] => 3
)

诀窍是将

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