php search table by id - php

Question

Im trying to display all the information from a single row in my database table by the id.
When I click search it shows the entire table and the search really doesnt do anything..
Any help would be appreciated. Thank you :)
im using php/mysql
<?php
session_start();
include('connect.php');
if(isset($_POST['search']))
{
$q = $_POST['srch_query'];
?>
<form method="post" action="">
<input type="text" name="srch_query" value="<?php echo $q ?>" required>
<input type="submit" name="search" value="Search">
</form>
<?php
$search = $db->prepare("SELECT species, tree_desc, age, city, state, location FROM tree_info");
$search->execute();
if($search->rowcount()==0){ echo "No product found!"; }
else
{
echo "Search Result:</br>";?>
<table border="1" cellspacing="0" cellpadding="4">
<thead>
<tr>
<th>Species</th>
<th>Description</th>
<th>Age</th>
<th>City</th>
<th>State</th>
<th>Location</th>
</tr>
</thead>
<tbody>
<?php foreach($search as $s)
{ ?>
<tr class="record">
<td><?php echo $s['species']; ?></td>
<td><?php echo $s['tree_desc']; ?></td>
<td><?php echo $s['age']; ?></td>
<td><?php echo $s['city']; ?></td>
<td><?php echo $s['state']; ?></td>
<td><?php echo $s['location']; ?></td>
</tr>
<?php }
}
} ?>
</tbody>
</table>

Answer 1

You should use $q in your query to filter your resultset. Currently you only send the var to the server, without doing anything with it.
$search = $db->prepare("SELECT species, tree_desc, age, city, state, location FROM tree_info WHERE tree_id=:id");
$search->execute([':id' => (int) $q]);

Answer 2

Your $search variable is a PDOStatement object. You need to fetch result.
Do it this way :
<?php
$results = $search->fetchAll();
foreach($results as $s)
{ ?>
<tr class="record">
<td><?php echo $s['species']; ?></td>
<td><?php echo $s['tree_desc']; ?></td>
<td><?php echo $s['age']; ?></td>
<td><?php echo $s['city']; ?></td>
<td><?php echo $s['state']; ?></td>
<td><?php echo $s['location']; ?></td>
</tr>
<?php } ?>
And check the doc for more informations on the PDOStatement if needed.
http://php.net/manual/fr/class.pdostatement.php
EDIT : my bad, I was focusing on the wrong problem.
You must add your $q to your query if it exists :
if ($q) {
$search = $db->prepare("SELECT species, tree_desc, age, city, state, location FROM tree_info WHERE id = :id");
$search->bindParam('id', $q, PDO::PARAM_INT);
} else {
$search = $db->prepare("SELECT species, tree_desc, age, city, state, location FROM tree_info");
}