Nav

<nav aria-label="Page navigation example">
    <ul class="pagination">
    <li class="page-item">
        <a class="page-link" href="index.php?p=<?php $p=1; echo $p;?>" aria-label="Previous">
            <span aria-hidden="true">&laquo;</span>
            <span class="sr-only"><?php $p=1; echo $p;?></span>
        </a>
        </li>
        <li class="page-item">
        <a class="page-link" href="index.php?p=<?php $p-=1; echo $p;?>" aria-label="Previous">
            <span aria-hidden="true">&laquo;</span>
            <span class="sr-only"><?php $p-=1; echo $p;?></span>
        </a>
        </li>
        <li class="page-item"><a class="page-link" href="index.php?p=<?php echo $p;?>"><?php echo $p;?></a></li>
        <li class="page-item"><a class="page-link" href="index.php?p=<?php $p+=1; echo $p;?>"><?php $p+=1; echo $p;?></a></li>
        <li class="page-item">
        <a class="page-link" href="index.php?p=<?php ($p+=1); echo $p;?>" aria-label="Next">
            <span aria-hidden="true">&raquo;</span>
            <span class="sr-only"><?php ($p+=1); echo $p;?></span>

        </a>
        </li>
        <li class="page-item">
        <a class="page-link" href="index.php?p=<?php echo $total_paginas;?>" aria-label="Next">
            <span aria-hidden="true">&raquo;</span>
            <span class="sr-only"><?php echo $total_paginas;?></span>

        </a>
        </li>
    </ul>
</nav>