PHP 两个数组合并array_merge

//var_dump($_POST['description']);

if($type=="1"){

$arr1 = array(

"mcou" => $_POST['mcou'],

"scou" => $_POST['scou']

);

}else if($type=="2"){

$arr1 = array(

"yjcou" => $_POST['yjcou'],

"dzcou" => $_POST['dzcou']

);

}else if($type=="3"){

$arr1 = array(

"dycou" => $_POST['dycou']

);

}

$arr2 = array(

"name" => getstr($_POST['name'], 30, 1, 1, 1) ,

"classid" => intval($_POST['classid']),

"typeid" => intval($_POST['type']),

"storeid" => intval($_POST['storeid']),

"integral"=> intval($_POST['integral']),

"effect" => $_POST['effect'],

"recommend" =>intval($_POST['recommend']),

"introduct" => getstr($_POST['introduct'], 0, 1, 1, 1) ,

"valid" => getstr($_POST['valid'], 10, 1, 1, 1) ,

"displayorder" => intval($_POST['displayorder']),

"lastupdate" => $_JOYEGB['timestamp']

);

$arr = array_merge($arr1,$arr2);