如何使用PHP修改数组排序

<?php    //创建数组    $fruits = array("apple", "banana", "orange", "grape");        echo "排序前的数组：";    print_r($fruits);  //输出数组        //使用sort()函数按照元素值进行升序排序    sort($fruits);            echo "按照元素值升序排列后的数组：";    print_r($fruits);  //输出数组?>

排序前的数组：Array(    [0] => apple    [1] => banana    [2] => orange    [3] => grape)按照元素值升序排列后的数组：Array(    [0] => apple    [1] => banana    [2] => grape    [3] => orange)

<?php    //创建数组    $age = array(25, 27, 17, 30, 22, 19);    $name = array("Peter", "Bob", "Sarah", "John", "Tom", "Jack");        //使用array_multisort()函数按照年龄升序排列，同时保留姓名数组的键名    array_multisort($age, SORT_ASC, SORT_NUMERIC, $name);        echo "按照年龄升序排列后的姓名数组：";    print_r($name);  //输出数组?>

按照年龄升序排列后的姓名数组：Array(    [2] => Sarah    [5] => Jack    [0] => Peter    [4] => Tom    [1] => Bob    [3] => John)