PHP中如何将数组元素按照指定规则进行分组

//原始数组
$students = array(
    array('name' => '张三', 'score' => 80),
    array('name' => '李四', 'score' => 90),
    array('name' => '王五', 'score' => 70),
    array('name' => '赵六', 'score' => 85),
    array('name' => '孙七', 'score' => 95),
);

//新的分组数组
$groupedStudents = array();

foreach ($students as $student) {
    $score = $student['score'];
    if (!isset($groupedStudents[$score])) {
        $groupedStudents[$score] = array();
    }
    $groupedStudents[$score][] = $student;
}

//打印结果
print_r($groupedStudents);

Array(
    [80] => Array(
        [0] => Array(
            [name] => 张三
            [score] => 80
        )
    )
    [90] => Array(
        [0] => Array(
            [name] => 李四
            [score] => 90
        )
    )
    [70] => Array(
        [0] => Array(
            [name] => 王五
            [score] => 70
        )
    )
    [85] => Array(
        [0] => Array(
            [name] => 赵六
            [score] => 85
        )
    )
    [95] => Array(
        [0] => Array(
            [name] => 孙七
            [score] => 95
        )
    )
)

$groupedStudents = array_reduce($students, function ($result, $student) {
    $score = $student['score'];
    if (!isset($result[$score])) {
        $result[$score] = array();
    }
    $result[$score][] = $student;
    return $result;
}, array());

//打印结果
print_r($groupedStudents);

$groupedStudents = array_chunk($students, 1, true);
//打印结果
print_r($groupedStudents);