问题描述
我正在为CodeIgniter创建一个库，我想传递不同类型的多个参数（一个PDO对象，用户名和密码，配置等）。
I am making a library for CodeIgniter, and I wish to pass multiple parameters of different types (a PDO object, username and password, configurations, etc).
我知道我可以传递所有这些东西的数组，但这似乎不是最好的方式做事情（ $ params 不能描述什么
I know I can pass an array of all of these things, but that doesn't seem to be the best way of doing things (as $params can't ever describe what is needed).
如何将多个参数传递给库？
How can I pass multiple parameters to a library?
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推荐答案
这个问题有几种方法。我会列出（以优先顺序）我知道解决它的方式：
There are several approaches to this particular problem. I'll list (in preferred order) ways I know to solve it:
关联数组参数：
这种方法非常灵活，因为参数的顺序无关紧要，它解决了很多人对PHP定义函数参数的很大的抱怨。你只需传递你想要的非默认参数。
This approach is pretty flexible, as the order of the parameters doesn't matter, and it resolves a pretty big complaint many have with how PHP defines function parameters. You simply pass in the "non-default" parameters you want. This is probably the most "codeigniterish" way to do it, if that's even a thing.
class MyLibrary {
public function __construct($params = array())
{
// Merge default parameter names and values,
// with given $params array
$params = array_merge(array(
'server' => 'myserver',
'database' => 'mydatabase',
'username' => 'myuser',
'password' => 'mypassword'
), $params);
// Create variables from parameter list
extract($params);
var_dump($server);
var_dump($database);
var_dump($username);
var_dump($password);
}
}
// Initialization:
$this->load->library('mylibrary', array(
'server' => 'server-arg1',
'database' => 'database-arg2'
));
编号参数：
此方法复制典型的PHP参数范例（定义所有预期参数的名称，顺序和默认值）。
This approach replicates the typical PHP parameter paradigm (defines names, orders, and default values for all expected parameters).
class MyLibrary {
public function __construct($params = array())
{
// Add relevant defaults to missing parameters
$params = array_merge($params, array_slice(array(
'myserver',
'mydatabase',
'myuser',
'mypassword'
), count($params)));
// Create variables from parameter list
extract(array_combine(array(
'server',
'database',
'username',
'password'
), $params));
var_dump($server);
var_dump($database);
var_dump($username);
var_dump($password);
}
}
// Initialization:
$this->load->library('mylibrary', array('server-arg1', 'database-arg2'));
覆盖CI装载器类：
这是你自己的风险。基本上， CI_Loader :: _ ci_init_class（）方法需要使用 MY_Loader 类和相应的方法重写。这些是你不喜欢的行（我的安装中的行1003-1012）：
This is AT YOUR OWN RISK. Basically, the CI_Loader::_ci_init_class() method needs to be overridden with a MY_Loader class and corresponding method. These are the lines that you "don't like" (lines 1003-1012 in my install):
// Instantiate the class
$CI =& get_instance();
if ($config !== NULL)
{
$CI->$classvar = new $name($config);
}
else
{
$CI->$classvar = new $name;
}
我可以猜到的最安全的替换是：
The "safest" replacement that I could guess would be this:
// Instantiate the class
$CI =& get_instance();
if (isset($config[1])
{
// With numeric keys, it makes sense to assume this is
// is an ordered parameter list
$rc = new ReflectionClass($name);
$CI->$classvar = $rc->newInstanceArgs($config);
}
elseif ($config !== NULL)
{
// Otherwise, the default CI approach is probably good
$CI->$classvar = new $name($config);
}
else
{
// With no parameters, it's moot
$CI->$classvar = new $name;
}
我真的不知道这会破坏多少事情，但我几乎肯定会说有什么，这不是真的值得的风险。我非常推荐上述第一种方法。
I really don't know how many things this will break, but I can almost certainly say there will be something. It's not really worth the risk. I'd STRONGLY recommend the first approach above.
干杯！
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