<?php
$uri = parse_url($_SERVER['REQUEST_URI']??'/',PHP_URL_PATH);
$links = [
    ['/compras/dashboard','Painel'],
    ['/compras/notas-entrada','Notas de Entrada'],
    ['/compras/por-fornecedor','Por Fornecedor'],
    ['/compras/pedidos','Pedidos'],
    ['/compras/compras-vendas','Compras × Vendas'],
];
?>
<div class="pbi-submenu mb-3">
<?php foreach($links as [$href,$lbl]): $a=($uri===$href)?'ativo':''; ?>
    <a href="<?= $href ?>" class="pbi-submenu-link <?= $a ?>"><?= $lbl ?></a>
<?php endforeach; ?>
</div>
