PHP arrays: indexed vs keyed

I have a method, fetch_widgets, that fetches widgets from the (MySQL) database. I pass it an $options array so I can selectively add WHERE and JOIN clauses, add/remove columns etc.

For example:

    $options = array();
    $options[] = 'include_disabled';
    $options[] = 'include_tag_ids';
    $options['start_date'] = '2011-01-01';
    $options['end_date'] = '2011-01-31';

In fetch_widgets I check for the options using either:

    if(array_key_exists('st开发者_JS百科art_date',$options)) { ... }

or:

    if(in_array('include_tag_ids',$options)) { ... }

depending on whether or not the option is activated just be being present (e.g. include_disabled) or has a key and a value (e.g. end_date).

I'm running into difficulties because I'm getting strange results from in_array when the $options array contains keyed and non-keyed values. Can anyone shed any light on this?

Don't mix/match keyed and non-keyed arrays if you need consistent behavior.

Instead, do something like this:

$options = array();
$options['include_disabled'] = true;
$options['include_tag_ids'] = true;
$options['start_date'] = '2011-01-01';
$options['end_date'] = '2011-01-31';