foreach语句和设置变量以在循环外使用

Question

I have created a foreach statement that will access a MySQL database and will display the Username and ID of each person in the database in a list -- no problem there. The button next to each person will display the ID number -- no problem there. However when I press the button it will return the value of the very last person which in this case is 30 rather than the number 1 or whatever number of the button I press.

I think this is because as the page is displayed it assigns the ID to the variable for each pass of the loop as it is being displayed.

$ID will be set to the last one because on displaying the page it goes through everyone in the list before finishing off at the last option, just in displaying the page. So when it comes to me pressing the button of course $ID will be set to 30, because it had to count up to that just so I can see it. That is the problem I'm having. When I press the button I want the Session['id'] to be set to what ever the $ID is set to then, not what the $ID is set to after the page has finished displaying.

<?php
include 'connect.php';

foreach($db->query("SELECT * FROM Staff") as $row) {
    $ID = $row['id']
    Echo $row['id'];
    Echo $row['FirstName'];
    Echo $row['LastName'];
?> 


<button Class="link" id="OpenUp"><?php echo $id; $_SESSON['id'] = $id; ?></button>
<?php } ?>

Answer 1

Your code will always set $_SESSION['id'] to your last value.

You can start a form before the loop and use this bit of code instead of button

<input type="submit" name="setsessionid" value="<?php echo $row['id']; ?>" />

After that all you have to do is set the variable as $_SESSION['id'] using

<?php if(isset($_POST['setsessionid']) { $_SESSION['id'] = $_POST['setsessionid']; } ?>