php - 需要根据给定的句子创建一个随机句子

下面这句话，

{Please|Just} make this {cool|awesome|random} test sentence {rotate {quickly|fast} and random|spin and be random}

我需要创建一个random（）函数，它将给出以下输出：

Please make this cool test sentence rotate fast and random.
OR
Just make this random test sentence spin and be random.

我不知道该怎么做。
我试过下面的，但没有得到结果。

echo spinningFunction($str);

function spinningFunction($str)
{
    $output = "";
    $pattern = "/\[.*?\]|\{.*?\}/";
    preg_match_all($pattern, $str, $match);

    $arr = array_map(function($value){
        return explode("|", $value);
    }, $match[1]);


    foreach($arr[0] as $adj)
        foreach($arr[1] as $name)
            $output.= "{$adj} make this {$name} test sentence<br />";
    return $output;
}

有什么帮助吗？
编辑：

function spinningFunction($str)
{
    $str = preg_replace_callback('/(\{[^}]*)([^{]*\})/im', "spinningFunction", $str);
    return $str;
}

有人能帮我从上面的句子中得到如下数组吗：

Array
(
    [0] => Array
        (
            [0] => {Please|Just}
            [1] => {cool|awesome|random}
            [2] => {rotate {quickly|fast} and random|spin and be random}
        )
)

最佳答案

这是一个需要对嵌套集使用语法{a|[b|c]}的解决方案。它也只能手动深入一级，因此没有干净/简单的递归。根据您的用例，这可能是好的。

function randomizeString($string)
{
    if(preg_match_all('/(?<={)[^}]*(?=})/', $string, $matches)) {
        $matches = reset($matches);
        foreach($matches as $i => $match) {
            if(preg_match_all('/(?<=\[)[^\]]*(?=\])/', $match, $sub_matches)) {
                $sub_matches = reset($sub_matches);
                foreach($sub_matches as $sub_match) {
                    $pieces = explode('|', $sub_match);
                    $count = count($pieces);

                    $random_word = $pieces[rand(0, ($count - 1))];
                    $matches[$i] = str_replace('[' . $sub_match . ']',     $random_word, $matches[$i]);
                }
            }

            $pieces = explode('|', $matches[$i]);
            $count = count($pieces);

            $random_word = $pieces[rand(0, ($count - 1))];
            $string = str_replace('{' . $match . '}', $random_word, $string);
        }
    }

    return $string;
}

var_dump(randomizeString('{Please|Just} make this {cool|awesome|random} test sentence {rotate [quickly|fast] and random|spin and be random}.'));
// string(53) "Just make this cool test sentence spin and be random."

var_dump(randomizeString('You can only go two deep. {foo [bar|foo]|abc 123}'));
// string(33) "You can only go two deep. foo foo"