Binding in php with postgres - php

Question

I have problem with bindings, I want to insert name or surname in label Pisatelj as keyword to search for this author,
I want also do the same way if I insert keyword for Naslov(=Title of book)
please correct my code
I have this code in php with postgres:
function get_knjige_sql ( )
{
global $CRUD;
$dbh = $CRUD['dbh'];
$str_query = '';
if(isset($_POST['Knaslov'])){
$str_query = addslashes($_POST['Knaslov']);
}
if(isset($_POST['Ppriimek'])){
$str_query = addslashes($_POST['Ppriimek']);
}
$query = " SELECT * FROM knjiga, pisatelj, zaloga WHERE (knjiga.naslov ILIKE '?' OR CONCAT(pisatelj.ime, ' ', pisatelj.priimek) ILIKE '?' ) AND knjiga.p_id = pisatelj.p_id AND knjiga.k_id = zaloga.k_id AND zaloga.prodana = false ";
if($sth)
$sth->bindValue(':Knaslov', $Knaslov, PDO::PARAM_STR);
$sth->bindValue(':Ppriimek', $Ppriimek, PDO::PARAM_STR);
if($sth)
$sth->execute();
else error('get_knjige_sql: select prepare returned no statement handle');
$err = $sth->errorInfo();
if($err[0] != 0) error( $err[2] );
return($sth);
}
main.php:
<!-- main html file for CRUD (php version) -->
<?php echo $CRUD["MESSAGES"] ?><?php echo $CRUD["ERRORS"] ?>
<div class="form">
<form action="<?php echo $CRUD["SELF"] ?>" method="post" name="knjiga">
<p class="subheading"><?php echo $CRUD["FORM_HEAD"] ?></p>
<table class="form">
<tr>
<td><p class="Afield"> Naslov:</p></td>
<td><input class="Afield" type="text" name="Knaslov" value="<?php echo $CRUD["Knaslov"] ?>"> </td>
</tr>
<tr>
<td><p class="Afield"> Isbn:</p></td>
<td><input class="Afield" type="text" name="kisbn" value="<?php echo $CRUD["Kisbn"] ?>"> </td>
</tr>
<tr>
<td><p class="Afield"> Cena:</p></td>
<td><input class="Afield" type="text" name="Kcena" value="<?php echo $CRUD["Kcena"] ?>"> </td>
</tr>
<tr>
<td><p class="Afield"> Pisatelj:</p></td>
<td><input class="Afield" type="text" name="Ppriimek" value="<?php echo $CRUD["Pime"] ?><?php echo $CRUD["Ppriimek"] ?>"> </td>
</tr>
<tr class="buttons"><td colspan="2">
<p class="buttons">
<?php echo $CRUD["BUTTONS"] ?><?php echo $CRUD["HIDDENS"] ?>
</p>
</td></tr>
</table>
</form>
</div>
<?php echo $CRUD["PRECONTENT"] ?><?php echo $CRUD["CONTENT"] ?><?php echo $CRUD["POSTCONTENT"] ?>