Testing the existance of a value in an array

And I've used in_array, array_search and a quick custom function
(replicating in_array's functionality) and the behavior is consistent
between functions, but still is not what is desired (or logical).

PHP Version 4.3.8

I have an array called $filter:

Array
(
    [0] => oid
    [1] => app_edit_field_id
)

and the in_array is returning screwy values:

var_dump(in_array("oid",$filter));
   bool(false)
var_dump(in_array("app_edit_field_id",$filter));
   bool(true)

Compare to using a different filter array:
Array
(
    [0] => oid
    [1] => app_edit_field_id
    [2] => oid
)

var_dump(in_array("oid",$filter));
   bool(true)
var_dump(in_array("app_edit_field_id",$filter));
   bool(false)
Lets try reversing the original array:
Array
(
    [0] => app_edit_field_id
    [1] => oid
)

var_dump(in_array("oid",$filter));
   bool(true)
var_dump(in_array("app_edit_field_id",$filter));
   bool(false)


Just to be sure, lets try another array containing different values:

Array
(
    [0] => table_name
    [1] => user_group
)
var_dump(in_array("table_name",$filter));
   bool(false)
var_dump(in_array("user_group",$filter));
   bool(true)

Does this make any sense to anyone?
This seems horribly illogical!  Any input would be greatly appreciated.

Regards,
Benjamin Holmberg

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