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PHP 的ArrayAccess接口 像数组一样来访问你的PHP对象_PHP

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Release: 2016-06-01 12:17:45
Original
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复制代码 代码如下:
interface ArrayAccess
boolean offsetExists($index)
mixed offsetGet($index)
void offsetSet($index, $newvalue)
void offsetUnset($index)

下面的例子展示了如何使用这个接口,例子并不是完整的,但是足够看懂,:->
复制代码 代码如下:
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'];
?>

实际上,当 $userMap['John'] 查找被执行时,PHP 调用了 offsetGet() 方法,由这个方法再来调用数据库相关的 getUserId() 方法。
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