scrap files from a subdirectories, for emails, and echo them out as a CSV.

scrap_emails.php

<?php

$folders = glob("*", GLOB_ONLYDIR);

$emailPattern = "/[A-z0-9._%+-]+@[A-z0-9.-]+\.[A-z]{2,}/";

foreach ($folders as $folder) {
    $files = glob("$folder/*.html");
    foreach ($files as $file) {
        $contents = file_get_contents($file);

        echo "$folder,";
        if (preg_match($emailPattern, $contents, $matches)) {
            echo "$matches[0]";
        };
        echo PHP_EOL;

    }
}