通过正则递归搜索指定目录里的文件

recursive-iterator-file.php

<?php

foreach (new RegexIterator(new RecursiveIteratorIterator(new RecursiveDirectoryIterator('.', FilesystemIterator::SKIP_DOTS)), '/\.m3u8$/') as $file) {
    $name = $file->getBasename(sprintf('.%s', $file->getExtension()));
    $content = file_get_contents($file->getRealPath());
    $newContent = str_replace($name, urlencode($name), $content);
    file_put_contents($file->getRealPath(), $newContent);
}