带滤波器的排列生成器

我正在寻找可以生成这个的PHP想法/代码/算法：

我有 5 个字符的字符串 [a-zA-Z0-9]

我想用变量过滤器生成排列

滤波器：

1. 字符串为"W"
2. 字符串是一个数字
3. 字符串为"T"
4. 字符串为大写
5. 字符串为"3"

---

编辑：

<?php
$reset = fopen('list.txt', 'w');
fclose($reset);
$chars = str_split("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789");
$file = fopen('list.txt', 'a+');
foreach ($chars as $c0) {
    foreach ($chars as $c1) {
        foreach ($chars as $c2) {
            foreach ($chars as $c3) {
                foreach ($chars as $c4) {
                    $filter = "/[a-z][a-z][a-z][a-z][A-Z]/";
                    $list = $c0 . $c1 . $c2 . $c3 . $c4;
                    if (preg_match($filter, $list)) {
                        $data = $list . "'n";
                        file_put_contents('list.txt', $data, FILE_APPEND);
                    } 
                }
            }
        }
    }
}
fclose($file);
?>