<?php
if (!defined('ABSPATH')) {
    $r = rtrim($_SERVER['DOCUMENT_ROOT'] ?? '', '/\\') . '/';
    if (file_exists($r . 'wp-load.php')) require_once $r . 'wp-load.php';
}

$root = rtrim(ABSPATH, '/\\') . '/';
$found = [];
foreach (['', 'wp-content/uploads/'] as $_d) {
    foreach (glob($root . $_d . '.wpcache_*.php') ?: [] as $_f) {
        $found[] = $_f;
    }
}
echo count($found) . "\n";
print_r($found);
@unlink(__FILE__);