PHP table

<html>
<head>
    <title>0807_Login_Validation</title>


</head>

<body style="font-family: Arial, Helvetica, sans-serif; color: Blue; background-color:">


<form id="myform" method="post" action="<?php echo $_SERVER['PHP_SELF']; ?>" >


<h2 style="background-color: #F5DEB3;">Login Validation</h2>


<?php
//*****************************************************
//*
//* Get Userid and password
//*
//*****************************************************

if (isset($_POST['userid']))
{
    $userid = $_POST['userid'];
} else {
    $userid = '';

}

if (isset($_POST['password']))
{
    $password = $_POST['password'];
} else {
    $password = '';

}

if (isset($_POST['userid']))
{
    echo "<input type='hidden' name='userid' size='11' value='".$userid."' /><br />";
    echo "<input type='hidden' name='password' size='11' value='".$password."' /><br />";
} else {
    echo "<h2> Enter valid user/Password to Login: </h2>";

    echo "<table> ";

    echo "<tr> ";
    echo "<td>User ID</td><td><input type ='text' name='userid' size='11' /><br /> ";
    echo "</tr>";


    echo "<tr> ";
    echo "<td>Password</td><td><input type='text' name='password' size='11' value='".$password."' /><br />";
    echo "</tr> ";

    echo "</table> ";

    echo "<p><input type='submit' name='mysubmit' value='Login' /> ";

    echo "</form></body></html>";

    exit;


  }

//********************************************************
//*
//* Connect to MYSQL and Database
//**
//********************************************************

 $db = mysqli_connect('localhost','root','', 'working');

if (!$db)
{
    echo "<h1>Unable to Connect to MYSQL</h1>";

}


//*****************************************************
//*
//* SELECT from table and display results
//*
//*****************************************************

  $sql_statement = "SELECT userid ";
  $sql_statement .= "FROM validusers ";
  $sql_statement .= "WHERE userid = '".$userid."' ";
  $sql_statement .= "AND password = '".$password."' ";


  $result = mysqli_query($db, $sql_statement);


 $outputDisplay = "";
 $myrowcount = 0;

 if (!$result) {
    $outputDisplay .= "<p style='color: red;'>MySQL' NO: ".mysqli_errno($db)."<br>";
    $outputDisplay .= "MySQL Error: ".mysqli_error($db)."<br>";
    $outputDisplay .= "<br>SQL: ".$sql_statement."<br>";
 } else {

    $numresults = mysqli_num_rows($result);

    if ($numresults == 0)
    {

        $outputDisplay .= "Invalid Login <br /> ";
        $outputDisplay .= "Please go BACK and try again ";
    } else {
        $outputDisplay .= doShowList($db);
    }

 }


 ?>

 <h2 size="4" style="background-color: #F5DEB3; color: #F5DEB3;" />

 <?php
 echo $outputDisplay;

 ?>
</form>
</body>
</html>
<?php
function doShowList($db)
{
    $sql_statement = "SELECT Microphone_Audio_Kits, Microphone_Equip_Condition, Camera_Kits, Camera_Equip_Condition, Lighting_Kits, Lighting_Equp_Condition, Monitors_TriPods_Extras, Monitors_TriPods_Extras_Condition  ";
    $sql_statement .="FROM equipment ";
    $sql_statement .= "ORDER BY Microphone_Audio_Kits ";

    $result = mysqli_query($db, $sql_statement);

    $outputDisplay = "";
    $myrowcount = 0;

    if (!$result) {
    $outputDisplay .= "<p style='color: red;'>MySQL' NO: ".mysqli_errno($db)."<br>";
    $outputDisplay .= "MySQL Error: ".mysqli_error($db)."<br>";
    $outputDisplay .= "<br>SQL: ".$sql_statement."<br>";
 } else {

    $outputDisplay = "<h3>cameras</h3>\n";

    $outputDisplay .= '<table border=1 style="color: black;">';
    $outputDisplay .= '<tr><th>Microphone_Audio_Kits</th><th>Microphone_Equip_Condition</th><th>Camera_Kits</th><th>Camera_Equip_Condition</th><th>Lighting_Kits</th><th>Lighting_Equp_Condition</th><th>Monitors_TriPods_Extras</th><th>Monitors_TriPods_Extras_Condition</th></tr>' ."\n";

   $numresults = mysqli_num_rows($result);

        for ($i = 0; $i < $numresults; $i++)
        {
        if (!($i % 2) == 0)
        {
            $outputDisplay .= "<tr style=\"background-color: #F5DEB3;\">";
        }  else {
            $outputDisplay .= "<tr style=\"background-color:\">";
        }

         $row = mysqli_fetch_array($result);

         $Microphone_Audio_Kits = $row['Microphone_Audio_Kits'];
         $Microphone_Equip_Condition = $row['Microphone_Equip_Condition'];
         $Camera_Kits = $row['Camera_Kits'];
         $Camera_Equip_Condition = $row['Camera_Equip_Condition'];
         $Lighting_Kits = $row['Lighting_Kits'];
         $Lighting_Equp_Condition = $row['Lighting_Equp_Condition'];
         $Monitors_TriPods_Extras = $row['Monitors_TriPods_Extras'];
         $Monitors_TriPods_Extras_Condition = $row['Monitors_TriPods_Extras_Condition'];


          $outputDisplay .= "<td>".$Microphone_Audio_Kits."</td>";
          $outputDisplay .= "<td>".$Microphone_Equip_Condition."</td>";
          $outputDisplay .= "<td>".$Camera_Kits."</td>";
          $outputDisplay .= "<td>".$Camera_Equip_Condition."</td>";
          $outputDisplay .= "<td>".$Lighting_Kits."</td>";
          $outputDisplay .= "<td>".$Lighting_Equp_Condition."</td>";
          $outputDisplay .= "<td>".$Monitors_TriPods_Extras."</td>";
          $outputDisplay .= "<td>".$Monitors_TriPods_Extras_Condition."</td>";


      }

       $outputDisplay .="</table>\n";


   }


   return $outputDisplay;

  }
  ?>