PHP动态加载JS及版本管理技巧

<?php
$isAdmin = check_user_role() === 'admin';
if ($isAdmin): ?>
<script src="/js/admin-tools.js"></script>
<?php endif; ?>

<?php
$scripts = [];
$page = $_GET['page'] ?? 'home';

if ($page === 'dashboard') {
    $scripts[] = '/js/chart.js';
    $scripts[] = '/js/dashboard.js';
} elseif ($page === 'profile') {
    $scripts[] = '/js/upload.js';
}

foreach ($scripts as $src): ?>
<script src="<?php echo htmlspecialchars($src); ?>"></script>
<?php endforeach; ?>

<?php
function versioned_js($path) {
    $fullPath = $_SERVER['DOCUMENT_ROOT'] . $path;
    $version = file_exists($fullPath) ? filemtime($fullPath) : time();
    $url = $path . '?v=' . $version;
    return '<script src="' . htmlspecialchars($url) . '"></script>';
}
?>

<?php echo versioned_js('/js/app.js'); ?>

<script src="//cdn.example.com/jquery.min.js"></script>
<script>if (!window.jQuery) { document.write('<script src="/js/jquery.min.js"></script>'); }</script>