foreach($pitches as $pitch) with $pitch.$i

Question

How can I add $i to var $pitch in below code. Result should be

$pitch1, $pitch2, $pitch3, etc.

$i = '1';
foreach($pitches as $pitch) {
    if($pitch->option_name == 'agent_pitch_'.$i) $pitch.$i = $pitch->option_value ;
    $i++;
}