Detailed code explanation of the ArrayAccess interface in php
The dependency injection in slim is based on pimple, so I went to learn pimple again. Compared with the dependency injection class I wrote before, pimple has a very new usage. Instead of using
$container->session_storage = function ($c) {
return new $c['session_storage_class']($c['cookie_name']);
};, it is injected in an array:
$container['session_storage'] = function ($c) {
return new $c['session_storage_class']($c['cookie_name']);
}; When I looked at the source code, I realized that the trick is On the ArrayAccess interface provided by php5.
Official definition: An interface that provides the ability to access objects like accessing arrays.
This interface mainly defines four abstract methods:
abstract public boolean offsetExists ( mixed $offset ) #检查数据是否存在 abstract public mixed offsetGet ( mixed $offset ) #获取数据 abstract public void offsetSet ( mixed $offset , mixed $value ) #设置数据 abstract public void offsetUnset ( mixed $offset ) #删除数据
If you want the object to be used like a PHP array, then we need to implement ArrayAccess Interface
The code is as follows:
interface ArrayAccess boolean offsetExists($index) mixed offsetGet($index) void offsetSet($index, $newvalue) void offsetUnset($index)
The following example shows how to use this interface. The example is not complete, but it is enough to understand, :->
The code is as follows:
<?php
class UserToSocialSecurity implements ArrayAccess
{
private $db;//一个包含着数据库访问方法的对象
function offsetExists($name)
{
return
$this->db->userExists($name);
}
function offsetGet($name)
{
return $this->db->getUserId($name);
}
function offsetSet($name, $id)
{
$this->db->setUserId($name, $id);
}
function offsetUnset($name)
{
$this->db->removeUser($name);
}
}
$userMap = new UserToSocialSecurity();
print "John's ID number is " . $userMap['John'];
?>
In fact, when the $userMap['John'] search is executed, PHP calls the offsetGet() method, which is then called Database-related getUserId() method.
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