[PHP + Oracle] Problem s funkcijo

Spodanja koda mi ne izpiše nobenega zadetka, medtem ko, če zamenjam klic funkcije s telesom funkcije dela normalno? V čem je problem?

<?php
   
   function beri($s, $cp)
   {
       echo oci_bind_by_name($s, ':city_prefix', $cp);
       echo oci_execute($s);
       echo 'Cities beginning with ' . $cp . '<br /><br />';
    
       while ($res = oci_fetch_array($s)) 
       {
          echo $res['CITY'] . ', ' . $res['STATE_PROVINCE'] . "<br />";
       }
   }
   
    $c = oci_connect('hr', 'hr1', '//localhost/xe');
    $s = oci_parse($c,
    "select city, state_province from locations where city like :city_prefix");
    $cp = 'P%'; 
    beri($s,$cp);
    
    echo '<br /><br />';
    $cp = 'C%'; 
    beri($s,$cp);   
    
    oci_close($c);  
?>