ORA-01460 error when useing bind sql on oracle from php

[Are Pedersen <are@xxxxxxxxxxx>]

I get "ORA-01460: unimplemented or unreasonable conversion requested" 
when useing bind-sql on Oracle 9i.
I am useing OCI 8.1 client in PHP.

What is wrong? And what does this message mean?

Here is the code:
---***---
$bindarray1=array(':project1'=>$project);
$bindarray1[':userid']=$userid;
$rs = sql_query($qs,$bindarray1);

function sql_query($qs,$bindargs) {
  $stmt = @OCIParse($this->db_sqlhandler, $qs);
  if (!$stmt) {
    return false;
  }
  //bind all the variables
  if (is_array($bindargs)){
    foreach ($bindargs as $bindname => $bindvalue){
      OCIBindByName($stmt,$bindname,&$bindvalue,-1);
    }
  }
  if (@OCIExecute($stmt)) {
    return $stmt;
  }
  $DB_ERROR = OCIError($stmt);
  return $DB_ERROR;
}
---***---

vardump of bindargs:
array(2) {
  [":project1"]=>
  int(1)
  [":userid"]=>
  string(5) "10001"
}

vardump of DB_ERROR:
array(4) {
  ["code"]=>
  int(1460)
  ["message"]=>
  string(62) "ORA-01460: unimplemented or unreasonable conversion requested
"
  ["offset"]=>
  int(0)
  ["sqltext"]=>
  string(365) "SELECT acl.prjid, acl.groupid, acl.read_access , 
acl.write_access,acl.delete_access,acl.change_access
				FROM StructureTreeTbl outree, GroupChildrenTbl gg2, MembersTbl 
memb2, ACL acl
				WHERE
				(memb2.personid=:userid AND
				memb2.groupid=gg2.gchildid AND
				gg2.groupid=outree.orgchild AND
				outree.orgid = acl.groupid  AND acl.prjid=:project1)
				"
}

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