Question: I have a data entry php code. I am allowing the user to select a table to be displayed on a separate page for easy access. I can get the code to insert the selected table into the "maintable" table, but I can't get any information out of that table. The insert table file won't even get the current table name from it even though on that same page I am inserting into that database. So I figure if I can fix this problem, I can fix that one, too. The maintable table has just one column with one record in one of my other databases. I am doing this so that the user doesn't have access to this directly since they can see all of the other tables in a different database.

The data-entry-header.php file has my connect statements, $connect being the one I am using for this database connection. What I get as a result is my main-form.php file with no table name. So it isn't throwing any errors, it's just not getting the table name. I know my connect statement and table/column names are correct because I have used the same one for the insert statement.

```
include 'data-entry-header.php';
    $keys = array();

    /* Query for Main Table Value */
    $string = 'SELECT TableName FROM maintable';
    $resultMain = mysqli_query($connect, $string) or die(mysqli_error($link));
    while ($rowMain = mysqli_fetch_row($resultMain)){
        $table = $rowMain[0];
    }

    /* Display Message or Table */
    if ($table = NULL || $table = "" ){
        echo 'No Main Table has been set. Go to the <a href="set-main-table.php">Set Main Table</a> page to select a Main Table.';
    }
    else {
        include 'main-form.php';
    }

    /* Get footer Contents */
    include "../footer.php";

```

Answer: 
```
if ($table = NULL || $table = "" ){

```

You're confusing assignment `=` with comparison `==`

You should probably try:

```
if ($table == NULL || $table == "" ){

```
There are many other faults with your code.

* Instead of `die()`, you have to use more convenient `trigger_error();` which won't reveal sensitive info to anyone.
* if you are expecting only one result, there is no point in a loop
* PHP is a loosely typed language. No need for excessive conditions. just `if($table)` is enough for most cases
* using meaningful (and **consistent**) variable names also helps a lot

```
$sql = 'SELECT TableName FROM maintable';
$res = mysqli_query($connect, $sql) or trigger_error(mysqli_error($connect));
//                                            $connect, not $link ^
$row = mysqli_fetch_row($res);

/* Display Message or Table */
if (!$row){
    echo 'No Main Table has been set. Go to the <a href="set-main-table.php">Set Main Table</a> page to select a Main Table.';
} else {
    $table = $row[0];
    include 'main-form.php';
}

```