use string for select statement in database pdo php - php

Question

This is just a thought i have for my project is it possible to use a string for example an echo as parameter for select statement in database query?
here is the scenario:
For example when my page loads i automatically display the latest data in database say last five entry, as echo of course. and for each entry there are other details and in order to view those other details i will have an anchor for each echo and i will direct the user to another page..using the echo i want to query the database for other details..
Is this possible?
I know I cant put attribute name to echo so how is this possible?
Any suggestions?
Update
this is the page that will show the echo
<form method="POST" action="crud.php" enctype="multipart/form-data" >
<div class="headerimage"><img src="images/events.png"/></div>
<?php
foreach (LoadEvent() as $value){
echo '<div id="upcomingevent">';
//echo "<a href=\"#\" >".$value['searchresultwhat']."</a>";
echo "".$value['searchresultwhat']."";
echo "<input type='hidden' name=\"eventwhatcontent\" value=".$value['searchresultwhat'].">";
echo "<br/>\n";
echo $value['searchresultwhen'];
echo "<br/>\n";
echo $value['searchresultwhere'];
echo '</div>';
}
?>
</form>
then this is the method and the page where i must display the details of the event
<form method="POST" action="crud.php" enctype="multipart/form-data" >
<?php
echo '<div id="middlecontentupcomingevents">';
LoadSpecificEvent();
echo '<div id="upcomingeventcontentimage">';
echo "<img src=\"admin/".$events[4]."\">";
echo $events[0];
echo $events[1];
echo $events[2];
echo $events[3];
echo '</div>';
echo "<br/>\n";
echo '</div>';
echo '</div>';
?>
</form>
function LoadSpecificEvent(){
global $dbh;
//var_dump($dbh);
if (isset($_POST['eventwhatcontent'])) {
$eventwhat = $_POST['eventwhatcontent'];
$stmt = $dbh->prepare("SELECT * FROM events WHERE event_what = ?");
$stmt->bindValue(1,$eventwhat);
$stmt->execute();
$events = array();
$selected_row = $stmt->fetch(PDO::FETCH_ASSOC);
$events[] = array(
'searchresultwhat' => $selected_row['event_what'],
'searchresultwhere' => $selected_row['event_where'],
'searchresultwhen' => $selected_row['event_when'],
'searchresultwho' => $selected_row['event_who'],
'searchresultimg' => $selected_row['img_url']
);
print_r ($events);
return $events;
}
}