[PHP] Turn multiple input fields / selections into a single array

While trying to design a form so that it takes multiple inputs from text fields and multiselect selection menus, I was facing problem because even though I could handle a fixed number of fields in my script internally, what for multiple selections in a selection list?? The rescuer [] :)
Yes, just use it after the name of you input field, this way.

<select multiple class="input-medium search-query" id="autolist-filter-select" name="filter_str[]">

<input id="autolist-filter-text1" type="text" name="filter_str[]"/> <input id="autolist-filter-text2" type="text" name="filter_str[]"/>