Help me here

file.php

<?php

    $line = explode(", ", $api->returnCourseHandler()->returnPreviousCompletedCourse($username));
    // The response I get from this array if I print_r is "Array ( [0] => C1 [1] => C2 )"

    if (in_array("C1", $line)) {
        echo "
            <div class='col-md-4'>
                <div class='card'>
                    <div class='card-header'>
                        <strong class='card-title'>Course 1 <small><span class='badge badge-success float-right mt-1'>Success</span></small></strong>
                    </div>
                    <div class='card-body'>
                        <p class='card-text'>You finished this course!</p>
                    </div>
                    <div class='card-footer'>
                        <button class='btn btn-primary' disabled> Completed </button>
                    </div>
                </div>
            </div>

            <div class='col-md-4'>
                <div class='card'>
                    <div class='card-header'>
                        <strong class='card-title'>Course 2 <small><span class='badge badge-danger float-right mt-1'>Pending</span></small></strong>
                    </div>
                    <div class='card-body'>
                        <p class='card-text'>You have not completed this course!</p>
                    </div>
                    <div class='card-footer'>
                        <a href='page/course2.php' class='btn btn-primary'> Enroll </a>
                    </div>
                </div>
            </div>
        ";
    } else if (in_array("C2", $line)) {
        echo "
            <div class='col-md-4'>
                <div class='card'>
                    <div class='card-header'>
                        <strong class='card-title'>Course 1 <small><span class='badge badge-success float-right mt-1'>Success</span></small></strong>
                    </div>
                    <div class='card-body'>
                        <p class='card-text'>You have completed this course!</p>
                    </div>
                    <div class='card-footer'>
                        <button class='btn btn-primary' disabled> Completed </button>
                    </div>
                </div>
            </div>

            <div class='col-md-4'>
                <div class='card'>
                    <div class='card-header'>
                        <strong class='card-title'>Course 2 <small><span class='badge badge-success float-right mt-1'>Success</span></small></strong>
                    </div>
                    <div class='card-body'>
                        <p class='card-text'>You have completed this course!</p>
                    </div>
                    <div class='card-footer'>
                        <button class='btn btn-primary' disabled> Completed </button>
                    </div>
                </div>
            </div>

            <div class='col-md-4'>
                <div class='card'>
                    <div class='card-header'>
                        <strong class='card-title'>Course 3 <small><span class='badge badge-danger float-right mt-1'>Oops</span></small></strong>
                    </div>
                    <div class='card-body'>
                        <p class='card-text'>You have not completed this course!</p>
                    </div>
                    <div class='card-footer'>
                        <a href='page/course3.php' class='btn btn-primary'> Enroll </a>
                    </div>

                </div>
            </div>

        ";
    }
?>