index.php

<?php                                                                                                                 
/*
PHP Warning:  db2_bind_param(): Describe Param Failed 
*/

$conn = db2_connect('db', 'user', 'pass');                                                                     
                                                                                                                      
$sql = "                                                                                                              
  SELECT *                                                                                                            
  FROM MYTABLE
  WHERE FOO = '?'                                                                                                   
";                                                                                                                    
                                                                                                                      
$foo = 'bar';                                                                                                       
                                                                                                                      
$stmt = db2_prepare($conn, $sql);                                                                                     
                                                                                                                      
db2_bind_param($stmt, 1, "foo", DB2_PARAM_IN);                                                                      
                                                                                                                      
if (db2_execute($stmt)) {                                                                                             
    while ($row = db2_fetch_assoc($stmt)) {                                                                           
      var_dump($row);                                                                                                 
    }                                                                                                                 
} 

line 11 should be:
WHERE FOO = ?

Are you connecting to a remote IBM i? We are having the same issue when we connect to a remote IBM i, and try to query a table in the IASP. If we query a table in *SYSBAS, db2_bind_param works just fine.