以前对ArrayAccess不是很熟悉,现在整理下下有关ArrayAccess相关的知识,ArrayAccess接口就是提供像访问数组一样访问对象的能力的接口。
接口内容如下:
ArrayAccess {
//检查一个偏移位置是否存在
abstract public boolean offsetExists ( mixed $offset );
//获取一个偏移位置的值
abstract public mixed offsetGet ( mixed $offset );
//设置一个偏移位置的值
abstract public void offsetSet ( mixed $offset , mixed $value );
//复位一个偏移位置的值
abstract public void offsetUnset ( mixed $offset );
}
项目中使用,获取网站配置:
<?php
namespace lib;
use mpf\core\Di;
class config implements \ArrayAccess{
//定义存储数据的数组
protected $configs;
public function __construct($configs){
$this->configs = $configs;
$configs = \lib\model\Home::getWebConfig();
foreach( $configs as $config ){
if( !isset($this->configs[$config['sc_key']]) ){
$this->configs[$config['sc_key']] = $config['sc_content'];
}
}
}
public function get($key){
if( isset($this->configs[$key]) ){
return $this->configs[$key];
}elseif( $key == 'caipiao'){
$this->configs['caipiao'] = \lib\model\Home::getLcs();
return $this->configs[$key];
}elseif( $key == 'user_money' ){
if( isset($_SESSION['uid']) ){
if( $_SESSION['utype'] == 5 ){
$sql = 'select money from inner_user where uid=?';
}else{
$sql = 'select money from user where uid=?';
}
$this->configs['user_money'] = \mpf\core\Di::$Di->db->prepare_query($sql,[getUid()])->fetch(\PDO::FETCH_COLUMN);
return $this->configs['user_money'];
}
}
}
public function offsetExists($index){
return isset($this->configs[$index]);
}
public function offsetGet($index){
return $this->configs[$index];
}
public function offsetSet($index,$val){
$this->configs[$index] = $val;
}
public function offsetUnset($index){
unset($this->configs[$index]);
}
}
这样可以使用config对象来直接访问配置信息内容。
---------------------------------
配置程序:
我们可以通过ArrayAccess利用配置文件来控制程序。
1. 在项目更目录下创建一个config目录
2. 在config目录下创建相应的配置文件,比如app.php 和 database.php。文件程序如下
app.php
<?php return [ 'name' => 'app name', 'version' => 'v1.0.0' ];
database.php
<?php return [ 'mysql' => [ 'host' => 'localhost', 'user' => 'root', 'password' => '12345678' ] ];
3. Config.php实现ArrayAccess
<?php namespace Config; class Config implements \ArrayAccess { private $config = []; private static $instance; private $path; private function __construct() { $this->path = __DIR__."/config/"; } public static function instance() { if (!(self::$instance instanceof Config)) { self::$instance = new Config(); } return self::$instance; } public function offsetExists($offset) { return isset($this->config[$offset]); } public function offsetGet($offset) { if (empty($this->config[$offset])) { $this->config[$offset] = require $this->path.$offset.".php"; } return $this->config[$offset]; } public function offsetSet($offset, $value) { throw new \Exception('不提供设置配置'); } public function offsetUnset($offset) { throw new \Exception('不提供删除配置'); } } $config = Config::instance(); //获取app.php 文件的 name echo $config['app']['name'].PHP_EOL; //app name //获取database.php文件mysql的user配置 echo $config['database']['mysql']['user'].PHP_EOL; // root