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我正在学习一个用 PHP 构建模拟 Flickr 站点的教程。我正在添加所有用户 CRUD。用户类已经被定义并且具有正在使用和工作的方法。但是，一旦我添加了创建、更新、删除和保存的方法，它就会说找不到它们中的任何一个……我尝试修改有效的方法，但它们并没有改变。所以对我来说，似乎有一个用户类的缓存版本，因为 user.php 文件中的更改没有被识别。我已经使用 ctrl+F5 来刷新缓存，但这并没有改变任何东西......

这是我设置的目录

wamp
  www
    photo_gallery
      includes
        config.php
        constants.php
        database.php
        database_object.php
        functions.php
        initialize.php
        session.php
        user.php
      public
        admin
          index,php
          login.php
          logout.php
          logfile.php
          test.php
        images
        javascript
        layouts
        stylesheets
        index.php

这是我的 initialize.php 文件，它设置目录路径并加载所有需要的文件

<?php
    // Define the core paths
    // Define them as absolute paths to make sure that require_once works as expected

    //DIRECTORY_SEPARATOR is a php pre-defined constant
    // ( \ for Windows, / for Unix)
    defined('DS') ? null : define('DS', DIRECTORY_SEPARATOR);

    // checks if lib path exists if not defines the site root with the directory specified below
    // ***** needs to be updated when switched directories, servers or computers
    defined('SITE_ROOT') ? null :
        define('SITE_ROOT', DS.'Users'.DS.'Alan D'.DS.'Desktop'.DS.'wamp'.DS.'www'.DS.'photo_gallery');

    // Checks if lib path has been defined, if not it defines it using site path above
    defined('LIB_PATH') ? null : define('LIB_PATH', SITE_ROOT.DS.'includes');

    // first load config
    require_once(LIB_PATH.DS.'config.php');

    // load basic functions that are available for all other files
    require_once(LIB_PATH.DS.'functions.php');

    // load core object classes for application
    require_once(LIB_PATH.DS.'session.php');
    require_once(LIB_PATH.DS.'database.php');
    require_once(LIB_PATH.DS.'database_object.php');

    // load database-related object classes
    require_once(LIB_PATH.DS.'user.php'); 


?>

这是用户类，在我测试时它比这个更简单，但我继续按照步骤使方法能够在我创建它们时放入我的其他类中。

<?php
    require_once('database.php');

    class User extends DatabaseObject{

        protected static $db_fields = array('id', 'user_name', 'password', 
        'first_name', 'last_name');
        protected static $table_name="users";

        public $id;
        public $user_name;
        public $password;
        public $first_name;
        public $last_name;

        public function full_name(){
            if(isset($this->first_name) && isset($this->last_name)){
                return $this->first_name . " " . $this->last_name;
            } else {
                return "";
            }       
        }

        // authenticates user by checking if there is a row with the 
        // input user name and password, then returns the object if found
        // if not it returns false
        public static function authenticate($user_name="", $password=""){
            global $database;
            $user_name = $database->escape_values($user_name);
            $password = $database->escape_values($password);

            $sql = "SELECT * FROM users ";
            $sql .= "WHERE user_name = '{$user_name}' ";
            $sql .= "AND password = '{$password}' ";
            $sql .= "LIMIT 1";
            $result_array = self::find_by_sql($sql);

            return !empty($result_array) ? array_shift($result_array) : false;
        }

        // checks to see if the given attribute exsits for the current object
        private function has_attribute($attribute){
            // associative array with all attributes key and value pairs
            $object_vars = $this->attributes();

            // just check if the key exists and return true or false
            return array_key_exists($attribute, $object_vars);          
        }

        // returns a key value hash of the objects variables and values
        protected function attributes(){
            // get_object_vars returns an associative array with all attributes
            // (incl private) as the keys and their current values as value
            // return get_object_vars($this);   

            // this goes through the db fields and populates the hash
            $attributes = array();
            foreach(self::$db_fields as $field){
                if(property_exists($this, $field)){
                    $attributes[$field] = $this->$field;
                }
            }
            return $attributes;
        }

        // returns a sanitized (sql escaped) array of all the attributes
        protected function sanitized_attributes(){
            global $database;
            $clean_attributes = array();

            // sanitize the values before submitting
            // Note: does not alter the actual value of each attribute
            foreach($this->attributes() as $key => $value){
                $clean_attributes[$key] = $database->escape_value($value);
            }
            return $clean_attributes;
        }

        // this function check to see if the record is already there
        // and determines whether to create or update.
        public function save(){
            return isset($this->id) ? $this->update() : $this->create();
        }

        public function create(){
            global $database;
            $attributes = $this->sanitized_attributes();

            $sql = "INSERT INTO ".self::$table_name." (";
            $sql .= join(", ", array_keys($attributes));
            $sql .= ") VALUES ('";
            $sql .= join("', '", array_values($attributes));
            $sql .= "')";
            if($database->query($sql)){
                $this->id = $database->insert_id();
                return true;
            } else {
                return false;
            }
        }

        public function update(){
            global $database;
            $attributes = $this->sanitized_attributes();

            // set up the key, value string needed for the update statement
            foreach ($attributes as $key => $value){
                $attribute_pairs[] = "{$key}='{$value}'";
            }

            $sql = "UPDATE ".self::$table_name." SET ";
            $sql .= join(", ", $attribute_pairs);
            $sql .= " WHERE id='". $database->escape_value($this->id);

            $database->query($sql);
            return($database->affected_rows() == 1) ? true : false;
        }

        public function delete(){
            global $database;

            $sql = "DELETE FROM ".self::$table_name." ";
            $sql .= "WHERE id=". $database->escape_value($this->id);
            $sql .= " LIMIT 1";

            $database->query($sql);
            return($database->affected_rows() == 1) ? true : false;
        }       
    }
?>

在 admin/test.php 文件中它是这样设置的

<?php
require_once('../../includes/initialize.php');

if (!$session->is_logged_in()) { redirect_to("login.php"); }
?>

<?php  include_layout_template('admin_header.php'); ?>

<?php
$user = new User();

$user->user_name = "jDoe";
$user->password = "pass";
$user->first_name = "Jamie";
$user->last_name = "Doe";
echo $user->full_name();
$user->save();

//$user = User::find_by_id(1);
//$user->password = "pass1";
//$user->update();

?>

<?php  include_layout_template('admin_footer.php'); ?>

当我运行该页面时，我会加载管理标题布局，全名打印在屏幕上，并在其正下方显示：

致命错误：在第 17 行调用 C:\wamp\www\photo_gallery\public\admin\test.php 中未定义的方法 User::save()

create 和 update 也是如此……但是这些函数确实存在于 user.php 文件中，我什至清空了方法中的所有内容，以确保其中的 php 代码没有错误。

然后我通过 public/index.php 从公共文件夹尝试了测试

<?php
require_once('../includes/initialize.php');

if (!$session->is_logged_in()) { redirect_to("login.php"); }
?>

<?php  include_layout_template('admin_header.php'); ?>

<?php
$user = new User();

$user->user_name = "jDoe";
$user->password = "pass";
$user->first_name = "Jamie";
$user->last_name = "Doe";
$user->full_name();
$user->create();


?>

<?php  include_layout_template('admin_footer.php'); ?>

但这甚至没有加载管理标题布局......只是给了我与其他测试文件相同的错误。我非常肯定我正在根据设置的目录导航到正确的路径。

对于我的生活，我无法理解当我将内容添加到 user.php 中的用户类时，为什么/如何不更新用户对象。或者我如何使用我之前在用户中定义的其他方法，但是当我修改它们时它们不会改变...... php 是否会缓存我不知道的对象？我什至将 user.php 从包含目录中拉出……一切仍按上述说明运行……

任何见解将不胜感激。我一直在寻找一段时间，现在试图找到有类似问题的人，但我找不到。谢谢阅读。

4

1 回答 1

1

SITE_ROOT与您在目录结构中显示的内容相比，在您的 initialize.php 中，您的定义中似乎多了一个目录。您是否还有此代码的另一个副本，可能在photo_gallery实际上包含文件的目录中？

这是您所有包含指向的地方：

/Users/Alan D/Desktop/wamp/www/photo_gallery/includes
于 2012-09-18T21:09:01.937 回答