Convert my php code and divs to sit within a php echo statement - How?

Hi there.
I'm adapting a tutorial which uses ajax and php to pull information from my database, when  the user scrolls to the bottom of the page.

I noted however, that when I was reaching the bottom of the page, information wasn't always getting pulled from my database. I amended my code slightly to include my div tags within the php echo  (as per the original code) and the code now works (to an extent)  - it's pulling information as specified from the database.

So my working php code which displays the information on the page, and reloads is the following :

while($teacher = mysqli_fetch_array($data))
		{
			//here we are displaying the information from the database
			echo '
			<div class="container">
			<div class="col-sm-6 col-md-4 buffer">
			<div class="card" style="width: 100%;">
			
				<div class="card-header">
				<h1>'.$teacher['id'].'</h1>
				<img src="../public/img/flags/'.$teacher['nationality'].'flag.gif">
				<h2>'.$teacher['firstname'].'</h2>
				</div>
				
				<div class="card-body">
				<h1>'.$teacher['id'].'</h1>
				<h2>'.$teacher['firstname'].'</h2>
				</div>
			
			</div>
			</div>
			</div>
			';
		}

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However, I want to display more information within the while.. The following code represents the information I want to display within the while loop and how it should appear. This code displays everything correctly on it's own but the pulling of the data does not seem to work with it.  

<div class="row">
                			  	   
				
							 <?php while($teacher = mysqli_fetch_array($result)) //Goes through the results and carries out the following action while (for every) row in the result set
							 { ?> 
																		
						 
						 
<!-- card--------------------------------------------------------------------------------------------------------->				
							 <div class="col-sm-6 col-md-4 buffer">
                    				<div class="card" style="width: 100%;">
        										<div class="card-header">
        										<img src="public/img/flags/<?php echo h ($teacher['nationality']) ?>flag.gif" alt="teacher nationality" />
                                                <a href = "<?php echo 'Profile.php?id=' . $teacher['id'];?>"><strong>&nbsp;&nbsp;&nbsp;<?php echo h($teacher['firstname']); ?></strong></a>&nbsp; - &nbsp;<?php echo h($teacher['language']); ?> teacher&nbsp;&nbsp;
												
                                                </div>
    									
                                          		<div class="card-body">
        											 <div align="center"> 
                									 <a href = "<?php echo 'Profile.php?id=' . $teacher['id'];?>"><img src="http://orangutanenglish.com/upload/<?php echo h($teacher['photoid']); ?>" class="ojborder " width="176" height="156" alt="" title="" /></a></div>
                        									  <div class="col-sm text-center">
                        									  <br />
                    									 	  	<?php
																if($teacher['teflconfirm'] == "yest")
																{print ("<IMG SRC =public/img/icons/yes_t_icon.gif>");}
																else  
																{print ("<IMG SRC =public/img/icons/no_t_icon.gif>");}
															   
																?>&nbsp;&nbsp;
                    											<?php
																if($teacher['degreeconfirm'] == "yesd")
																{print ("<IMG SRC =public/img/icons/yes_d_icon.gif>");}
																elseif ($teacher['degreeconfirm'] == "studying")  
																{print ("<IMG SRC =public/img/icons/studying_icon.gif>");}
																else  
																{print ("<IMG SRC =public/img/icons/no_d_icon.gif>");}
																?>&nbsp;&nbsp;
                    											<?php
																if($teacher['expconfirm'] == "expconfirm")
																{print ("<IMG SRC =public/img/icons/yes_exp_icon.gif>");}
																elseif ($teacher['expconfirm'] == "someexpconfirm")  
																{print ("<IMG SRC =public/img/icons/some_exp_icon.gif>");}
																else  
																{print ("<IMG SRC =public/img/icons/no_d_icon.gif>");}
																?>&nbsp;&nbsp;
                    									  		<?php
																if($teacher['vid'] == "1")
																{print ("<IMG SRC =public/img/icons/video1.gif>");}
																
																?>&nbsp;&nbsp;
																<br><br>
                                                                <h6 class="card-subtitle mb-2 text-muted"><div align="center">profile added: May 2017</div></h6>
                                                                <p class="card-text"><div align="center">Price per lesson: <?php echo h($teacher['private_price']); ?><br>Teaching Locations: <?php echo h($teacher['prefecture']); ?></div></p>
                                                       		  </div>
															
															<button type="button" data-toggle="popover" class="btn btn-success btn-sm" data-placement="top" data-content="Sorry - only members can contact teachers" data-original-title="Members Only" data-trigger="focus">Ask about availabilty&nbsp;&nbsp;<i class="fa fa-comment-o" aria-hidden="true"></i></button> 
															<button type="button" data-toggle="popover"  class="btn btn-info btn-sm"  data-placement="bottom"  data-content="Sorry - only members can add favourites" data-original-title="Members Only" data-trigger="focus">Favourite&nbsp;&nbsp;<i class="fa fa-thumbs-o-up" aria-hidden="true"></i></button> 

													</div>
                                        	  
                    				
                				  </div>
							</div>	
					 
					  <?php } ?> 
					 
<!-- card-------------------------------------------------------------------------------------------------------------> 				 
			
			

	
	</div>

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I tried just adding this information in the while loop but for some reason (which I don't understand) the pulling of the records doesn't work. My thinking is that I have to adapt that code to sit within the php echo statement. I tried pasting it in, but my formatting of that code isn't working.

Am I thinking along the correct lines here, and if so, can anybody help or point me to a resource which shows how I can 'convert' my code to work within the php echo statement?

Hope that makes sense. It's all a tad jumbled in my head.

Many thanks for reading.