[Solved] PHP loop to echo certain div class on first round only

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<?php
                    $i=1;
                    while ( $loop->have_posts() ) : $loop->the_post(); ?>
                        <!-- individual panel -->
                        <div class="panel panel-default">
                            <div class="panel-heading">
                                <h4 class="panel-title">
                                    <a data-toggle="collapse" data-parent="#faqs" href="#<?php the_ID(); ?>">
                                        <?php the_title(); ?>
                                    </a>
                                </h4>
                            </div>
                            <div id="<?php the_ID(); ?>" class="panel-collapse collapse <?php if ($i==1) { echo 'in'; } ?>">
                                <div class="panel-body">
                                    <?php the_field('answer'); ?>
                                </div>
                            </div>
                        </div>
                        <!-- /individual panel -->  
                    <?php $i++; endwhile; 
                ?>

It should be $i==1 not $i=1 in your if condition

When you do $i=1 it means you are assigning value 1 to $i , so every time it is successfully satisfying condition.

Here is Comparison Operators 😀

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solved PHP loop to echo certain div class on first round only