如果使用标题（'Content-Type：application / json'）但没有图像工作，PHP REST API不接受图像

header('Content-Type: application/json'); 
if( isset($_POST['name']) && isset($_POST['mobile']) ){

    $biz_name = mysql_real_escape_string(trim($_POST['name']));
    $biz_phone = mysql_real_escape_string(trim($_POST['mobile']));   
    $biz_banner = $_FILES['imagebanner']['name'];
    $biz_banner_tmp = $_FILES['imagebanner']['tmp_name'];
    move_uploaded_file($biz_banner_tmp, "../profile_banner/$biz_phone.jpg");
    echo "acknowledgement";     
    exit();

}

i'm using postman rest client service to check this, if i choose form-data and using its not working but its working with x-www-form-urlencoded. i think im stuck with header();