PHP/MySQL: Displaying data from different tables based on a users ID - php

Question

I have two tables "personal_trainer" and "training_plan". PersonalTrainerID is a foreign key in training_plan. I want to display that when a trainer logs in with their email and password, only the training plans that apply to that ID appears.
However, I am having trouble understanding the logic. I have coded it so that all the information from the training_plan table appears, I cannot created it such that only the rows that apply to the ID are visible to the user. I have made this by the simple sql statement "SELECT * from training_plan". There is a filter textbox to search the table that doesn't effect the code if you're wondering.
I have commented the code to try make it easier to understand. Any help would be greatly appreciated!
<?php
if (isset($_POST['search'])) /*This code allows the filter textbox to search the db */
{
$valueToSearch = $_POST['ValueToSearch'];
$query = "select * from training_plan WHERE concat('trainingPlanID', `personalTrainerID`, `clientID`, `trainingType`, `exercise1`, `exercise2`, `exercise3`, `exercise4`, `exercise5`, `exercise6`, 'reps', 'sets', 'description')like'%".$valueToSearch."%'";
$search_result = filterTable($query);
}
else {
$query = "SELECT * from training_plan WHERE PersonalTrainerID= (SELECT personalTrainerID FROM personal_trainer WHERE email=$_SESSION['user'])"; /*The error that is displayed is 'syntax error, unexpected string after ['*/
$search_result = filterTable($query);
}
function filterTable($query)
{
$connect = mysqli_connect("localhost:3308","root","","fypdatabase");
$filter_Result = mysqli_query($connect, $query);
return $filter_Result;
}
?>
<?php /*This displays the data in a table but so far outputs all of the table data */
while($row = mysqli_fetch_array($search_result))
{
?>
<tr>
<td><?php echo $row["trainingPlanID"]; ?></td>
<td><?php echo $row["personalTrainerID"]; ?></td>
<td><?php echo $row["clientID"]; ?></td>
<td><?php echo $row["trainingType"]; ?></td>
<td><?php echo $row["exercise1"]; ?></td>
<td><?php echo $row["exercise2"]; ?></td>
<td><?php echo $row["exercise3"]; ?></td>
<td><?php echo $row["exercise4"]; ?></td>
<td><?php echo $row["exercise5"]; ?></td>
<td><?php echo $row["exercise6"]; ?></td>
<td><?php echo $row["reps"]; ?></td>
<td><?php echo $row["sets"]; ?></td>
<td><?php echo $row["description"]; ?></td>
<td>
Delete
</td>
<td>
Update
</td>
</tr>
<?php

Answer 1

Change your query to:
$query = "SELECT * from training_plan WHERE PersonalTrainerID = (SELECT personalTrainerID FROM personal_trainer WHERE email='".$_SESSION['user']."')";