我们使用了短代码，如bellow

   ob_start();
    $rand = uniqid();


    ?>
    <div class="faq-item-sm panel panel-default">
        <div class="panel-heading" id="headingTwo">
            <h4 class="panel-title"><a data-toggle="collapse" href="#faq<?php echo $rand; ?>" data-parent="#accordionFaq" class="collapsed">  <?php echo $question; ?><span class="caret-toggle closed">–</span><span class="caret-toggle opened">+</span></a></h4>
        </div>
        <div id="faq<?php echo $rand; ?>" class="panel-collapse collapse <?php if($faq_active == true){ echo \'in\';} ?> ">
            <div class="panel-body">
                 <?php echo $answer; ?>
            </div>
        </div>
    </div>
    <?php
    return ob_get_clean();

在php中多次使用echo和ob\\u start是否是最佳实践。这是否会影响性能。