<?php
    function get_ra($input)
    {
        $servername = "localhost";
        $username = "root";
        $password = "x";
        $dbname = "gestao_trabalhos";

        // Create connection
        $conn = mysqli_connect($servername, $username, $password, $dbname);
        mysqli_set_charset($conn, "utf8"); // mysqli extension

        //variaveis com queries à db
        $sqlx = "SELECT ra FROM trabalhos WHERE id='$input'";
        $x = mysqli_query($conn, $sqlx);
        $x = $x->fetch_object()->ra;
        echo "<a href='".$x."'>Link</a>";
        $conn->close();
    }
    return ;

?>