PHP排序数组按字母顺序排列？

Question

我有一个阵列..

$test = array("def", "yz", "abc", "jkl", "123", "789", "stu");

如果我sort()坚持下去,我得到

Array
(
    [0] => 123
    [1] => 789
    [2] => abc
    [3] => def
    [4] => jkl
    [5] => stu
    [6] => yz
)

但我想看到它

Array
(
    [0] => abc
    [1] => def
    [2] => jkl
    [3] => stu
    [4] => yz
    [5] => 123
    [6] => 789
)

我试过array_reverse,似乎没有改变任何东西.所以我现在迷失了如何获得最后的数字,但也是如此

Answer 1

你需要的是排序,但有自定义比较功能(usort).以下代码将完成它:

function myComparison($a, $b){
    if(is_numeric($a) && !is_numeric($b))
        return 1;
    else if(!is_numeric($a) && is_numeric($b))
        return -1;
    else
        return ($a < $b) ? -1 : 1;
} 
$test = array("def", "yz", "abc", "jkl", "123", "789", "stu");
usort ( $test , 'myComparison' );

Answer 2

您可以在排序之前将数字转换为整数:

$array = array("def", "yz", "abc", "jkl", "123", "789", "stu");

foreach ($array as $key => $value) {
    if (ctype_digit($value)) {
        $array[$key] = intval($value);
    }
}

sort($array);
print_r($array);

输出:

Array
(
  [0] => abc
  [1] => def
  [2] => jkl
  [3] => stu
  [4] => yz
  [5] => 123
  [6] => 789
)