Question

我有变量：

$data = "Article 4 Article 2 Article 10";

我需要输出：

Article 2 Article 4 Article 10

我试过这样的事情：

<?php

$data = "Article 4 Article 2 Article 10";

function sort_titles_article_numbers($a,$b) {
    $akey = $a->$data;
    if (preg_match('/^Article (\d+)\. /', $akey, $matches)) {
        $akey = $matches[1];
    }
    $bkey = $b->$data;
    if (preg_match('/^Article (\d+)\. /', $bkey, $matches)) {
        $bkey = $matches[1];
    }
    if ($akey == $bkey) {
        return 0;
    }
    return ($akey < $bkey) ? -1 : 1;
}
uasort($data,'sort_titles_article_numbers');

echo $data;

?>

但是有些不对劲。似乎uasort只适用于数组，但我如何在变量中对它进行排序？

Answer 1

$data = "Article 4 Article 2 Article 10";

// line below splits string by number, keeping it, and trims elements of array
$tmp = array_map('trim', preg_split('/\d+\K/', $data));

natsort($tmp); // very useful function for 'natural' sorting

echo join(' ', $tmp);  // converts array to string

结果 - Article 2 Article 4 Article 10

Answer 2

如果你想只优先考虑数字，我找到了一种更好的数字排序方法：

$data = "Artihcle 4 Artizcle 2 Article 10";

$tmp = preg_split('/\w \d+\K/', $data);


usort($tmp, function ($a, $b) {
    preg_match('/\d+$/', $a, $matchA);
    preg_match('/\d+$/', $b, $matchB);
    return $matchA[0] - $matchB[0];
});


$data2 = join(' ', $tmp);

echo trim($data2);

按数字顺序对变量内容进行排序

2 个答案: