PHP 类的有关问题

PHP 类的问题
调用源码

PHP code

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$obj_car = new class_car;
$num_carId = $obj_car->fn_carAdd($_POST);

类源码

PHP code

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class class_car {
    function fn_carAdd($arr_post) {
        print_r($arr_post);
    }
}

这样可以正常输出数组

PHP code

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Array
(
    [action_post] => carAdd
    [str_postChk] => 
    [str_carName] => 高尔夫
    [num_carBrand] => 7
    [num_carModel] => 615
    [str_carEmiss] => 1.4T
    [str_carTrans] => MT
)

类源码

PHP code

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class class_car {
    function fn_carAdd($arr_post) {
        print_r($arr_post["str_carName"]);
    }
}

这样输出乱码，求解，文件本身编码都没问题

------解决方案--------------------
header发送编码。
加在程序开始就行了。

header('Content-Type:text/html; charset=utf-8');