custom WP FAQ schema WP no plugins. ddm

in header.php =>
<?php
global $aFaQItems;
$aMeta =get_post_meta($post->ID);
//Extract FAQ items from faq custom fields
$aFaQItems=[];
if (isset($aMeta["faq"]))
    foreach ($aMeta["faq"] as $index=>$sFaq)
    {
        $sAnswer="";
        $sQuestion="";
        $iIndex =   strpos($sFaq, "?", 0);   //get pos of first question mark..
        if ($iIndex == true)
        {
            $sQuestion = substr($sFaq, 0, $iIndex );
            $sAnswer = substr($sFaq, $iIndex+1 );
            $aFaQItems[]=[$sQuestion, $sAnswer];
        }
        else
            continue;
    }

?>

also in header.php, before closing </head> tag


<?php
    //Extract FAQ items from faq custom fields and echo the appropriate jsonld to the page..

    if (isset($aMeta["faq"]))
    {
        echo '
        <script type="application/ld+json">
        {
            "@context": "https://schema.org",
            "@type": "FAQPage",
            "mainEntity": [
        ';

        $iNumFaqs=sizeof($aFaQItems);

        foreach ($aFaQItems as $index=>$aFaq)
        {
    ?>
                {
                  "@type": "Question",
                  "name": "<?php echo $aFaq[0]?>?",
                  "acceptedAnswer": {
                    "@type": "Answer",
                    "text": "<?php echo addslashes(wpautop($aFaq[1]));?>"
                  }
                }<?php
        if(($index+1)!=  $iNumFaqs)
            echo ',';
        }
        echo '

         ]
        }
        </script>';
    }

?>

in review template, or page / post template
<?php
 global $post, $aMeta;

?>


                        <div class="row no-gutters" id="faqrowhome" style="">
                            <div class="col-md-12 text-center">
                                    <h2 class="moduleheader" style="margin: auto; margin-bottom: 10px;">Frequently Asked Questions</h2>
                                </div>
                             <div class="col-md-12 " id="">
                                <?php
                                    foreach ($aFaQItems as $index=>$aFaq)
                                    {

                                     if ($index>1)
                                        $sIsExpanded="true";
                                     else
                                        $sIsExpanded="false";
                                ?>
                                  <div class="card">
                                    <div class="card-header" id="heading-<?php echo $index;?>">
                                      <h5 class="mb-0">
                                        <button class="btn btn-link <?php  if ($index>1) echo 'collapsed';?>" type="button" data-toggle="collapse" data-target="#collapse-<?php echo $index;?>" aria-expanded="<?php echo $sIsExpanded;?>" aria-controls="collapse-<?php echo $index;?>">
                                          <?php echo $aFaq[0];?>?
                                        </button>
                                      </h5>
                                    </div>

                                    <div id="collapse-<?php echo $index;?>" class="collapse <?php if ($index==0) echo 'show';?>" aria-labelledby="heading-<?php echo $index;?>" data-parent="#accordionExample">
                                      <div class="card-body">
                                       <?php echo wpautop( $aFaq[1],   $br = true );?>
                                      </div>
                                    </div>
                                  </div>

                                  <?php
                                    }
                                  ?>

                            </div>

                        </div>

<?php

?>