php配列の動的追加実現コード（最土団購システムの価格配列）

<?php 
$now=time(); 
$oc = array( 
'team_type' => 'normal', 
"begin_time < '{$now}'", 
"end_time > '{$now}'", 
); 
$p="p2"; 
$pp1=""; 
$pp2=""; 
$now = time(); 
switch ($p) 
{ 
case "p1": 
$pp1="team_price < 10"; 
$pp2=""; 
break; 
case "p2": 
$pp1="team_price > 10"; 
$pp2="team_price < 50"; 
break; 
case "p3": 
$pp1="team_price > 50"; 
$pp2="team_price < 100"; 
break; 
case "p4": 
$pp1="team_price > 100"; 
$pp2="team_price < 200"; 
break; 
case "p5": 
$pp1="team_price > 200"; 
$pp2=""; 
break; 
default: 
$pp1=""; 
$pp2=""; 
} 
if(!empty($pp1)){ 
array_push($oc,$pp1); 
} 
if(!empty($pp2)){ 
array_push($oc,$pp2); 
} 
print_r($oc); 

?>