PHP if statement used to set class not functioning properly.

Hello, I am attempting to set the class of a <li> using a PHP if statement. The goal is to highlight the name of the person currently logged in. However the class is being set for all users and I cannot figure out why. Here is the code snippet:
	while ($row = mysql_fetch_array($leaders)) {?>
					 <li class ="<?php if($row["UserID"] = '$user_id'){echo 'leaderboard__user-highlight';} ?>"><div class="leader__wrap">
							<div class="course-list__item--details"><h6><?php echo $row["FName"] ?> <?php echo $row["LName"] ?> </h6>
								<p><?php echo $row["User_points"] ?></p>
							<h5 class="user__badge  badge--expert">Expert</h5>
					<?php } ?>

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I have verified that the $user_id is correct for the user that is logged in and that each line item does have a different UserID, what am I missing here? Thanks.
Michelle JacksonAsked:
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Martyn SpencerSoftware Developer / Linux System Administrator / Managing DirectorCommented:
Did you intend to use
$row["UserID"] = '$user_id'

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or did you mean
$row["UserID"] == $user_id

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Michelle JacksonAuthor Commented:
I used == got no hits and then I played around with it and changed it to = and that is when all rows were assigned the class.
Martyn SpencerSoftware Developer / Linux System Administrator / Managing DirectorCommented:
The = operator is assignment and I imagine you are wanting to carry out a check for equality. Please note that I also removed the ' characters from around your $user_id variable.
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Michelle JacksonAuthor Commented:
Ah the extra quotation marks were the culprit...thanks.
Martyn SpencerSoftware Developer / Linux System Administrator / Managing DirectorCommented:
It was both :) With the quotes around your variable, you would be comparing the value returned from the database to the string value '$user_id'. Glad that it is working for you now.
Julian HansenCommented:
Recommendation - this might make your life a bit easier
First up take a read of how PHP strings work here.
In particular understand the difference between single and double quotes and how those work with respect to embedding variables.
Then take a look at the HEREDOC notation - it is a great tool when doing HTML block output as it allows for the best of both single and double quotes.
I have reformatted your code using HEREDOC and not only does it become easier to read it also shows that you are missing a closing </div> in your code which you will need to fix.

As mentioned above learn difference between == (test for equality) and = (assignment).

while ($row = mysql_fetch_array($leaders)) {
// Create a class variable that holds the class value for use in the HEREDOC OUTPUT
// This uses a ternary expression for determining the value of $class
$class =  $row["UserID"] == $user_id ? 'leaderboard__user-highlight' : '';

echo <<< HTML
<li class="{$class}">
  <div class="leader__wrap">
    <div class="course-list__item--details">
      <h6>{$row["FName"]} {$row["LName"]}</h6>
      <h5 class="user__badge  badge--expert">Expert</h5>
  </div><!-- ADDED MISSING div -->

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Michelle JacksonAuthor Commented:
Julian, thanks, I actually did have the div tag there I just didn't include it in the code sample...thanks.
Julian HansenCommented:
Ok, but still consider using HEREDOC - it really simplifies things quite a bit.
Michelle JacksonAuthor Commented:
Thanks Julian I definitely will.
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