php 访问类变量
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Accessing class variables
提问by SmootQ
It's the first time I use OOP with PHP 5.. so this is my problem..
这是我第一次在 PHP 5 中使用 OOP .. 所以这是我的问题..
I have a file disp.phpthat contains a class named class disp (model in MVC)
我有一个文件disp.php，其中包含一个名为 class disp 的类（MVC 中的模型）
<?php
class disp{
public $n_pages;
public $current_page;
private $cmd2;
/***************SQL command generator*******************/
private function getCmd2($cmd1,$id,$first_entry,$perpage,$tri){
$cmd2=str_replace('COUNT(*)','*',$cmd1);
$cmd2=$cmd2.' ORDER BY '.$id.' '.$tri.' LIMIT '.$first_entry.','.$perpage;
return $cmd2;
}
/********************Items display******************/
function dispItems($cmd1,$id,$perpage,$tri){
require('global/connection.inc.php');
try{
foreach($pdo->query($cmd1)as $r){
$n_pages=ceil($r[0]/$perpage);
if (isset ($_GET['pg'])){
$current_page=intval($_GET['pg']);
if ($current_page>$n_pages){
$current_page=$n_pages;
}
if ($current_page<=0){
$current_page=1;
}
}
else{
$current_page=1;
$_GET['pg']=1;
}
}
$i=1;
$first_entry=($current_page-1)*$perpage;
$objet=new disp();
$cmd2=$objet->getCmd2($cmd1,$id,$first_entry,$perpage,$tri);
$data=array();
$i=0;
foreach($pdo->query($cmd2) as $r){
$data[$i]=$r;
$i++;
}
return $data;
}catch(PDOException $e){}
}
}
this is the file news.php(controller in MVC):
这是文件news.php（MVC 中的控制器）：
require MODELS_DIR.'disp.php';
$objet=new disp();
$news=$objet->dispItems('SELECT COUNT(*) FROM tbl_nouveautes','ID_EVENT',10,'DESC');
$c_page=$objet->$current_page;
$n_pages= $objet->$n_pages;
require VIEWS_DIR.'disp-news.php';
in this code, I created an object (objet) of the type disp... I want to use the variables declared in the function dispItems, ($n_pagesand $current_page) in the view (disp-news.php)
在这段代码中，我创建了一个类型为 disp 的对象（objet）...我想在视图（）中使用函数中声明的变量dispItems，（$n_pages和）$current_pagedisp-news.php
so I think that the class variables are the same variables in the function dispItems()... but when trying to access them from the controller ...using object. it shows me a error :
所以我认为类变量在函数中是相同的变量dispItems()......但是当试图从控制器访问它们时......使用对象。它向我显示了一个错误：
See:
看：
Notice: Undefined variable: n_pages in C:\Program Files\EasyPHP-5.3.6.1\www\example\admin\global\news.php on line 14
Fatal error: Cannot access empty property in C:\Program Files\EasyPHP-5.3.6.1\www\example\admin\global\news.php on line 14
Inspite of $n_pagesand $current_pagesbeing public in the class disp
的Inspite$n_pages和$current_pages公职类中的DISP
thank you in advance
先感谢您
回答by Dogbert
c_page=$objet->$current_page;
n_pages= $objet->$n_pages;
should be
应该
$c_page=$objet->current_page;
$n_pages= $objet->n_pages;
回答by a1ex07
In the body of non-static class methods you need to access class members like $this->current_page, not $current_page
在非静态类方法的主体中，您需要访问类成员，例如$this->current_page，而不是$current_page
