php 셀랙트 박스 오류... 도와주세요... ㅠㅠ

// 프로세싱 가격 가져오기 
$order_opt1 = "$productInfor[a1]"; 
$order_opt2 = "$productInfor[a2]"; 
$order_opt3 = "$productInfor[a3]"; 
$order_opt4 = "$productInfor[a4]"; 
 
 
<input type=hidden name=local_pick value="<?= $reserveInfor[local_pick] ?>"> 
 
<select name='rate' class=form_box> 
<option selected="selected" value="$productInfor[a1]"> Regular : $<?= $order_opt1 ?>/page </option> 
<option value="$productInfor[a2]"> Fast : $<?= $order_opt2 ?>/page </option> 
<option value="$productInfor[a3]"> Express : $<?= $order_opt3 ?>/page </option> 
<option value="$productInfor[a4]"> Urgent : $<?= $order_opt4 ?>/page </option> 
</select>