CI framework loader Loader.php source code analysis, ciloader.php_PHP tutorial

CI framework loader Loader.php source code analysis, ciloader.php

As the name suggests, the loader loads elements. When using CI, the following are often loaded:

$this->load->library()
$this->load->view()
$this->load->model()
$this->load->database()
$this->load->helper()
$this->load->config()
$this->load->add_package_path()

Copy code The code is as follows:

/**
* Loader Class
*
* Users load views and files. Common functions include model(), view(), library(), helper()
*
* A good assistant for Controller, $this->load =& load_class('Loader', 'core');. Once loader is loaded, Controller becomes extremely powerful
​*/
class CI_Loader {
 protected $_ci_ob_level;
 protected $_ci_view_paths  = array();
 protected $_ci_library_paths = array();
 protected $_ci_model_paths  = array();
 protected $_ci_helper_paths  = array();
 protected $_base_classes  = array(); // Set by the controller class
 protected $_ci_cached_vars  = array();
 protected $_ci_classes   = array();
 protected $_ci_loaded_files  = array();
 
 protected $_ci_models   = array();
 protected $_ci_helpers   = array();
 protected $_ci_varmap   = array('unit_test' => 'unit',
           'user_agent' => 'agent');
 public function __construct()
 {      
                //获取缓冲嵌套级别
  $this->_ci_ob_level  = ob_get_level();
  //library路径
                $this->_ci_library_paths = array(APPPATH, BASEPATH);
                //helper路径
  $this->_ci_helper_paths = array(APPPATH, BASEPATH);
                //model路径
  $this->_ci_model_paths = array(APPPATH);
                //view路径
  $this->_ci_view_paths = array(APPPATH.'views/' => TRUE);
  log_message('debug', "Loader Class Initialized");
 }
 // --------------------------------------------------------------------
 /**
* Initialize Loader
*
​*/
 public function initialize()
 {
  $this->_ci_classes = array();
  $this->_ci_loaded_files = array();
  $this->_ci_models = array();
                //将is_loaded（common中记录加载核心类函数）加载的核心类交给_base_classes
  $this->_base_classes =& is_loaded();
                //加载autoload.php配置中文件
  $this->_ci_autoloader();
  return $this;
 }
 // --------------------------------------------------------------------
 /**
* Check whether the class is loaded
​*/
 public function is_loaded($class)
 {
  if (isset($this->_ci_classes[$class]))
  {
   return $this->_ci_classes[$class];
  }
  return FALSE;
 }
 // --------------------------------------------------------------------
 /**
* Load Class
​*/
 public function library($library = '', $params = NULL, $object_name = NULL)
 {
  if (is_array($library))
  {
   foreach ($library as $class)
   {
    $this->library($class, $params);
   }
   return;
  }
                //如果$library为空或者已经加载。。。
  if ($library == '' OR isset($this->_base_classes[$library]))
  {
   return FALSE;
  }
  if ( ! is_null($params) && ! is_array($params))
  {
   $params = NULL;
  }
  $this->_ci_load_class($library, $params, $object_name);
 }
 // --------------------------------------------------------------------
 /**
* Load and instantiate model
​*/
 public function model($model, $name = '', $db_conn = FALSE)
 {
                //CI支持数组加载多个model
  if (is_array($model))
  {
   foreach ($model as $babe)
   {
    $this->model($babe);
   }
   return;
  }
  if ($model == '')
  {
   return;
  }
  $path = '';
  // 是否存在子目录
  if (($last_slash = strrpos($model, '/')) !== FALSE)
  {
   // The path is in front of the last slash
   $path = substr($model, 0, $last_slash + 1);
   // And the model name behind it
   $model = substr($model, $last_slash + 1);
  }
  if ($name == '')
  {
   $name = $model;
  }
  if (in_array($name, $this->_ci_models, TRUE))
  {
   return;
  }
  $CI =& get_instance();
  if (isset($CI->$name))
  {
   show_error('The model name you are loading is the name of a resource that is already being used: '.$name);
  }
  $model = strtolower($model); //model文件名全小写
  foreach ($this->_ci_model_paths as $mod_path)
  {
   if ( ! file_exists($mod_path.'models/'.$path.$model.'.php'))
   {
    continue;
   }
   if ($db_conn !== FALSE AND ! class_exists('CI_DB'))
   {
    if ($db_conn === TRUE)
    {
     $db_conn = '';
    }
    $CI->load->database($db_conn, FALSE, TRUE);
   }
   if ( ! class_exists('CI_Model'))
   {
    load_class('Model', 'core');
   }
   require_once($mod_path.'models/'.$path.$model.'.php');
   $model = ucfirst($model);
   $CI->$name = new $model();
                        //保存在Loader::_ci_models中，以后可以用它来判断某个model是否已经加载过。
   $this->_ci_models[] = $name;
   return;
  }
  // couldn't find the model
  show_error('Unable to locate the model you have specified: '.$model);
 }
 // --------------------------------------------------------------------
 /**
* Database Loader
​*/
 public function database($params = '', $return = FALSE, $active_record = NULL)
 {
  // Grab the super object
  $CI =& get_instance();
  // 是否需要加载db
  if (class_exists('CI_DB') AND $return == FALSE AND $active_record == NULL AND isset($CI->db) AND is_object($CI->db))
  {
   return FALSE;
  }
  require_once(BASEPATH.'database/DB.php');
  if ($return === TRUE)
  {
   return DB($params, $active_record);
  }
  // Initialize the db variable.  Needed to prevent
  // reference errors with some configurations
  $CI->db = '';
  // Load the DB class
  $CI->db =& DB($params, $active_record);
 }
 // --------------------------------------------------------------------
 /**
* Load database tool class
​*/
 public function dbutil()
 {
  if ( ! class_exists('CI_DB'))
  {
   $this->database();
  }
  $CI =& get_instance();
  // for backwards compatibility, load dbforge so we can extend dbutils off it
  // this use is deprecated and strongly discouraged
  $CI->load->dbforge();
  require_once(BASEPATH.'database/DB_utility.php');
  require_once(BASEPATH.'database/drivers/'.$CI->db->dbdriver.'/'.$CI->db->dbdriver.'_utility.php');
  $class = 'CI_DB_'.$CI->db->dbdriver.'_utility';
  $CI->dbutil = new $class();
 }
 // --------------------------------------------------------------------
 /**
  * Load the Database Forge Class
  *
  * @return string
 */
 public function dbforge()
 {
  if ( ! class_exists('CI_DB'))
  {
   $this->database();
  }
  $CI =& get_instance();
  require_once(BASEPATH.'database/DB_forge.php');
  require_once(BASEPATH.'database/drivers/'.$CI->db->dbdriver.'/'.$CI->db->dbdriver.'_forge.php');
  $class = 'CI_DB_'.$CI->db->dbdriver.'_forge';
  $CI->dbforge = new $class();
 }
 // --------------------------------------------------------------------
 /**
* Load view file
​*/
 public function view($view, $vars = array(), $return = FALSE)
 {
  return $this->_ci_load(array('_ci_view' => $view, '_ci_vars' => $this->_ci_object_to_array($vars), '_ci_return' => $return));
 }
 // --------------------------------------------------------------------
 /**
* Load ordinary files
​*/
 public function file($path, $return = FALSE)
 {
  return $this->_ci_load(array('_ci_path' => $path, '_ci_return' => $return));
 }
 // --------------------------------------------------------------------
 /**
  * 设置变量
  *
  * Once variables are set they become available within
  * the controller class and its "view" files.
  *
 */
 public function vars($vars = array(), $val = '')
 {
  if ($val != '' AND is_string($vars))
  {
   $vars = array($vars => $val);
  }
  $vars = $this->_ci_object_to_array($vars);
  if (is_array($vars) AND count($vars) > 0)
  {
   foreach ($vars as $key => $val)
   {
    $this->_ci_cached_vars[$key] = $val;
   }
  }
 }
 // --------------------------------------------------------------------
 /**
* Check and get variables
​*/
 public function get_var($key)
 {
  return isset($this->_ci_cached_vars[$key]) ? $this->_ci_cached_vars[$key] : NULL;
 }
 // --------------------------------------------------------------------
 /**
* Load helper
​*/
 public function helper($helpers = array())
 {
  foreach ($this->_ci_prep_filename($helpers, '_helper') as $helper)
  {
   if (isset($this->_ci_helpers[$helper]))
   {
    continue;
   }
   $ext_helper = APPPATH.'helpers/'.config_item('subclass_prefix').$helper.'.php';
   // 如果是扩展helper的话
   if (file_exists($ext_helper))
   {
    $base_helper = BASEPATH.'helpers/'.$helper.'.php';
    if ( ! file_exists($base_helper))
    {
     show_error('Unable to load the requested file: helpers/'.$helper.'.php');
    }
    include_once($ext_helper);
    include_once($base_helper);
    $this->_ci_helpers[$helper] = TRUE;
    log_message('debug', 'Helper loaded: '.$helper);
    continue;
   }
   // 如果不是扩展helper，helper路径中加载helper
   foreach ($this->_ci_helper_paths as $path)
   {
    if (file_exists($path.'helpers/'.$helper.'.php'))
    {
     include_once($path.'helpers/'.$helper.'.php');
     $this->_ci_helpers[$helper] = TRUE;
     log_message('debug', 'Helper loaded: '.$helper);
     break;
    }
   }
   // 如果该helper还没加载成功的话，说明加载helper失败
   if ( ! isset($this->_ci_helpers[$helper]))
   {
    show_error('Unable to load the requested file: helpers/'.$helper.'.php');
   }
  }
 }
 // --------------------------------------------------------------------
 /**
* You can see that the helpers call is also the above helper, it is just an alias of helpers
​*/
 public function helpers($helpers = array())
 {
  $this->helper($helpers);
 }
 // --------------------------------------------------------------------
 /**
* Load language file
​*/
 public function language($file = array(), $lang = '')
 {
  $CI =& get_instance();
  if ( ! is_array($file))
  {
   $file = array($file);
  }
  foreach ($file as $langfile)
  {
   $CI->lang->load($langfile, $lang);
  }
 }
 // --------------------------------------------------------------------
 /**
* Load configuration file
​*/
 public function config($file = '', $use_sections = FALSE, $fail_gracefully = FALSE)
 {
  $CI =& get_instance();
  $CI->config->load($file, $use_sections, $fail_gracefully);
 }
 // --------------------------------------------------------------------
 /**
* Driver
*
* Load driver library
​*/
 public function driver($library = '', $params = NULL, $object_name = NULL)
 {
  if ( ! class_exists('CI_Driver_Library'))
  {
   // we aren't instantiating an object here, that'll be done by the Library itself
   require BASEPATH.'libraries/Driver.php';
  }
  if ($library == '')
  {
   return FALSE;
  }
  // We can save the loader some time since Drivers will *always* be in a subfolder,
  // and typically identically named to the library
  if ( ! strpos($library, '/'))
  {
   $library = ucfirst($library).'/'.$library;
  }
  return $this->library($library, $params, $object_name);
 }
 // --------------------------------------------------------------------
 /**
* Add Package path
*
* Add package path to library, model, assistant, configuration path
​*/
 public function add_package_path($path, $view_cascade=TRUE)
 {
  $path = rtrim($path, '/').'/';
  array_unshift($this->_ci_library_paths, $path);
  array_unshift($this->_ci_model_paths, $path);
  array_unshift($this->_ci_helper_paths, $path);
  $this->_ci_view_paths = array($path.'views/' => $view_cascade) + $this->_ci_view_paths;
  $config =& $this->_ci_get_component('config');
  array_unshift($config->_config_paths, $path);
 }
 // --------------------------------------------------------------------
 /**
* Get Package Paths, which does not include BASEPATH by default
​*/
 public function get_package_paths($include_base = FALSE)
 {
  return $include_base === TRUE ? $this->_ci_library_paths : $this->_ci_model_paths;
 }
 // --------------------------------------------------------------------
 /**
  * 剔除Package Path
  *
  * Remove a path from the library, model, and helper path arrays if it exists
  * If no path is provided, the most recently added path is removed.
  *
 */
 public function remove_package_path($path = '', $remove_config_path = TRUE)
 {
  $config =& $this->_ci_get_component('config');
  if ($path == '')
  {
   $void = array_shift($this->_ci_library_paths);
   $void = array_shift($this->_ci_model_paths);
   $void = array_shift($this->_ci_helper_paths);
   $void = array_shift($this->_ci_view_paths);
   $void = array_shift($config->_config_paths);
  }
  else
  {
   $path = rtrim($path, '/').'/';
   foreach (array('_ci_library_paths', '_ci_model_paths', '_ci_helper_paths') as $var)
   {
    if (($key = array_search($path, $this->{$var})) !== FALSE)
    {
     unset($this->{$var}[$key]);
    }
   }
   if (isset($this->_ci_view_paths[$path.'views/']))
   {
    unset($this->_ci_view_paths[$path.'views/']);
   }
   if (($key = array_search($path, $config->_config_paths)) !== FALSE)
   {
    unset($config->_config_paths[$key]);
   }
  }
  // 保证应用默认的路径依然存在
  $this->_ci_library_paths = array_unique(array_merge($this->_ci_library_paths, array(APPPATH, BASEPATH)));
  $this->_ci_helper_paths = array_unique(array_merge($this->_ci_helper_paths, array(APPPATH, BASEPATH)));
  $this->_ci_model_paths = array_unique(array_merge($this->_ci_model_paths, array(APPPATH)));
  $this->_ci_view_paths = array_merge($this->_ci_view_paths, array(APPPATH.'views/' => TRUE));
  $config->_config_paths = array_unique(array_merge($config->_config_paths, array(APPPATH)));
 }
 // --------------------------------------------------------------------
 /**
  * Loader
  *
  * This function is used to load views and files.
  * Variables are prefixed with _ci_ to avoid symbol collision with
  * variables made available to view files
  *
  * @param array
  * @return void
 */
 protected function _ci_load($_ci_data)
 {
  // Set the default data variables
  foreach (array('_ci_view', '_ci_vars', '_ci_path', '_ci_return') as $_ci_val)
  {
   $$_ci_val = ( ! isset($_ci_data[$_ci_val])) ? FALSE : $_ci_data[$_ci_val];
  }
  $file_exists = FALSE;
                //如果$_ci_path不为空，则说明当前要加载普通文件。Loader::file才会有path
  if ($_ci_path != '')
  {
   $_ci_x = explode('/', $_ci_path);
   $_ci_file = end($_ci_x);
  }
  else
  {
   $_ci_ext = pathinfo($_ci_view, PATHINFO_EXTENSION);
   $_ci_file = ($_ci_ext == '') ? $_ci_view.'.php' : $_ci_view;
   foreach ($this->_ci_view_paths as $view_file => $cascade)
   {
    if (file_exists($view_file.$_ci_file))
    {
     $_ci_path = $view_file.$_ci_file;
     $file_exists = TRUE;
     break;
    }
    if ( ! $cascade)
    {
     break;
    }
   }
  }
                //view文件不存在则会报错
  if ( ! $file_exists && ! file_exists($_ci_path))
  {
   show_error('Unable to load the requested file: '.$_ci_file);
  }
  // 把CI的所有属性都传递给loader，view中$this指的是loader
  $_ci_CI =& get_instance();
  foreach (get_object_vars($_ci_CI) as $_ci_key => $_ci_var)
  {
   if ( ! isset($this->$_ci_key))
   {
    $this->$_ci_key =& $_ci_CI->$_ci_key;
   }
  }
  /*
   * Extract and cache variables
   *
   * You can either set variables using the dedicated $this->load_vars()
   * function or via the second parameter of this function. We'll merge
   * the two types and cache them so that views that are embedded within
   * other views can have access to these variables.
   */
  if (is_array($_ci_vars))
  {
   $this->_ci_cached_vars = array_merge($this->_ci_cached_vars, $_ci_vars);
  }
  extract($this->_ci_cached_vars);
  /*
   * 将视图内容放到缓存区
   *
   */
  ob_start();
  // 支持短标签
  if ((bool) @ini_get('short_open_tag') === FALSE AND config_item('rewrite_short_tags') == TRUE)
  {
   echo eval('?>'.preg_replace("/;*s*?>/", "; ?>", str_replace('   }
  else
  {
   include($_ci_path); // include() vs include_once() allows for multiple views with the same name
  }
  log_message('debug', 'File loaded: '.$_ci_path);
  // 是否直接返回view数据
  if ($_ci_return === TRUE)
  {
   $buffer = ob_get_contents();
   @ob_end_clean();
   return $buffer;
  }
  //当前这个视图文件是被另一个视图文件通过$this->view()方法引入，即视图文件嵌入视图文件
  if (ob_get_level() > $this->_ci_ob_level + 1)
  {
   ob_end_flush();
  }
  else
  {       ////把缓冲区的内容交给Output组件并清空关闭缓冲区。
   $_ci_CI->output->append_output(ob_get_contents());
   @ob_end_clean();
  }
 }
 // --------------------------------------------------------------------
 /**
* Load class
​*/
 protected function _ci_load_class($class, $params = NULL, $object_name = NULL)
 {
  // 去掉.php和两端的/获取的$class就是类名或目录名+类名
  $class = str_replace('.php', '', trim($class, '/'));
  // CI允许dir/filename方式
  $subdir = '';
  if (($last_slash = strrpos($class, '/')) !== FALSE)
  {
   // 目录
   $subdir = substr($class, 0, $last_slash + 1);
   // 文件名
   $class = substr($class, $last_slash + 1);
  }
  // 允许加载的类名首字母大写或全小写
  foreach (array(ucfirst($class), strtolower($class)) as $class)
  {
   $subclass = APPPATH.'libraries/'.$subdir.config_item('subclass_prefix').$class.'.php';
   // 是否是扩展类
   if (file_exists($subclass))
   {
    $baseclass = BASEPATH.'libraries/'.ucfirst($class).'.php';
    if ( ! file_exists($baseclass))
    {
     log_message('error', "Unable to load the requested class: ".$class);
     show_error("Unable to load the requested class: ".$class);
    }
    // Safety:  Was the class already loaded by a previous call?
    if (in_array($subclass, $this->_ci_loaded_files))
    {
     // Before we deem this to be a duplicate request, let's see
     // if a custom object name is being supplied.  If so, we'll
     // return a new instance of the object
     if ( ! is_null($object_name))
     {
      $CI =& get_instance();
      if ( ! isset($CI->$object_name))
      {
       return $this->_ci_init_class($class, config_item('subclass_prefix'), $params, $object_name);
      }
     }
     $is_duplicate = TRUE;
     log_message('debug', $class." class already loaded. Second attempt ignored.");
     return;
    }
    include_once($baseclass);
    include_once($subclass);
    $this->_ci_loaded_files[] = $subclass;
                                //实例化类
    return $this->_ci_init_class($class, config_item('subclass_prefix'), $params, $object_name);
   }
   // 如果不是扩展，和上面类似
   $is_duplicate = FALSE;
   foreach ($this->_ci_library_paths as $path)
   {
    $filepath = $path.'libraries/'.$subdir.$class.'.php';
    // Does the file exist?  No?  Bummer...
    if ( ! file_exists($filepath))
    {
     continue;
    }
    // Safety:  Was the class already loaded by a previous call?
    if (in_array($filepath, $this->_ci_loaded_files))
    {
     // Before we deem this to be a duplicate request, let's see
     // if a custom object name is being supplied.  If so, we'll
     // return a new instance of the object
     if ( ! is_null($object_name))
     {
      $CI =& get_instance();
      if ( ! isset($CI->$object_name))
      {
       return $this->_ci_init_class($class, '', $params, $object_name);
      }
     }
     $is_duplicate = TRUE;
     log_message('debug', $class." class already loaded. Second attempt ignored.");
     return;
    }
    include_once($filepath);
    $this->_ci_loaded_files[] = $filepath;
    return $this->_ci_init_class($class, '', $params, $object_name);
   }
  } // END FOREACH
  // 如果还没有找到该class，最后的尝试是该class会不会在同名的子目录下
  if ($subdir == '')
  {
   $path = strtolower($class).'/'.$class;
   return $this->_ci_load_class($path, $params);
  }
  // 加载失败，报错
  if ($is_duplicate == FALSE)
  {
   log_message('error', "Unable to load the requested class: ".$class);
   show_error("Unable to load the requested class: ".$class);
  }
 }
 // --------------------------------------------------------------------
 /**
* Instantiate the loaded class
​*/
 protected function _ci_init_class($class, $prefix = '', $config = FALSE, $object_name = NULL)
 {
  // 是否有类的配置信息
  if ($config === NULL)
  {
   // Fetch the config paths containing any package paths
   $config_component = $this->_ci_get_component('config');
   if (is_array($config_component->_config_paths))
   {
    // Break on the first found file, thus package files
    // are not overridden by default paths
    foreach ($config_component->_config_paths as $path)
    {
     // We test for both uppercase and lowercase, for servers that
     // are case-sensitive with regard to file names. Check for environment
     // first, global next
     if (defined('ENVIRONMENT') AND file_exists($path .'config/'.ENVIRONMENT.'/'.strtolower($class).'.php'))
     {
      include($path .'config/'.ENVIRONMENT.'/'.strtolower($class).'.php');
      break;
     }
     elseif (defined('ENVIRONMENT') AND file_exists($path .'config/'.ENVIRONMENT.'/'.ucfirst(strtolower($class)).'.php'))
     {
      include($path .'config/'.ENVIRONMENT.'/'.ucfirst(strtolower($class)).'.php');
      break;
     }
     elseif (file_exists($path .'config/'.strtolower($class).'.php'))
     {
      include($path .'config/'.strtolower($class).'.php');
      break;
     }
     elseif (file_exists($path .'config/'.ucfirst(strtolower($class)).'.php'))
     {
      include($path .'config/'.ucfirst(strtolower($class)).'.php');
      break;
     }
    }
   }
  }
  if ($prefix == '')
  {       //system下library
   if (class_exists('CI_'.$class))
   {
    $name = 'CI_'.$class;
   }
   elseif (class_exists(config_item('subclass_prefix').$class))
   {       //扩展library
    $name = config_item('subclass_prefix').$class;
   }
   else
   {
    $name = $class;
   }
  }
  else
  {
   $name = $prefix.$class;
  }
  // Is the class name valid?
  if ( ! class_exists($name))
  {
   log_message('error', "Non-existent class: ".$name);
   show_error("Non-existent class: ".$class);
  }
  // Set the variable name we will assign the class to
  // Was a custom class name supplied?  If so we'll use it
  $class = strtolower($class);
  if (is_null($object_name))
  {
   $classvar = ( ! isset($this->_ci_varmap[$class])) ? $class : $this->_ci_varmap[$class];
  }
  else
  {
   $classvar = $object_name;
  }
  // Save the class name and object name
  $this->_ci_classes[$class] = $classvar;
  // 将初始化的类的实例给CI超级句柄
  $CI =& get_instance();
  if ($config !== NULL)
  {
   $CI->$classvar = new $name($config);
  }
  else
  {
   $CI->$classvar = new $name;
  }
 }
 // --------------------------------------------------------------------
 /**
* Autoloader
           *                                   * The automatic loading files configured by autoload.php are:
             *                                                                                                                      | 2. Libraries
                                               | 3. Helper files
                                    | 4. Custom config files
                                               | 5. Language files
                                                 | 6. Models
​*/
 private function _ci_autoloader()
 {
  if (defined('ENVIRONMENT') AND file_exists(APPPATH.'config/'.ENVIRONMENT.'/autoload.php'))
  {
   include(APPPATH.'config/'.ENVIRONMENT.'/autoload.php');
  }
  else
  {
   include(APPPATH.'config/autoload.php');
  }
  if ( ! isset($autoload))
  {
   return FALSE;
  }
  // 自动加载packages,也就是将package_path加入到library，model，helper，config
  if (isset($autoload['packages']))
  {
   foreach ($autoload['packages'] as $package_path)
   {
$this->add_package_path($package_path);
}
}
//Load config file
if (count($autoload['config']) > 0)
{
$CI =& get_instance();
foreach ($autoload['config'] as $key => $val)
{
$CI->config->load($val);
}
}
// Load helper and language
foreach (array('helper', 'language') as $type)
{
If (isset($autoload[$type]) AND count($autoload[$type]) > 0)
{
$this->$type($autoload[$type]);
}
}
// This seems to be for compatibility with previous versions
if ( ! isset($autoload['libraries']) AND isset($autoload['core']))
{
$autoload['libraries'] = $autoload['core'];
}
// Load libraries
if (isset($autoload['libraries']) AND count($autoload['libraries']) > 0)
{
//Load db
If (in_array('database', $autoload['libraries']))
{
$this->database();
$autoload['libraries'] = array_diff($autoload['libraries'], array('database'));
}
// Load all other libraries
foreach ($autoload['libraries'] as $item)
{
$this->library($item);
}
}
// Autoload models
if (isset($autoload['model']))
{
$this->model($autoload['model']);
}
}
//------------------------------------------------ ------------------
/**
* Returns an associative array composed of object properties
​*/
protected function _ci_object_to_array($object)
{
return (is_object($object)) ? get_object_vars($object) : $object;
}
//------------------------------------------------ ------------------
/**
* Get an instance of a CI component
​*/
protected function &_ci_get_component($component)
{
$CI =& get_instance();
return $CI->$component;
}
//------------------------------------------------ ------------------
/**
* Process file names. This function mainly returns the correct file name
​*/
protected function _ci_prep_filename($filename, $extension)
{
if ( ! is_array($filename))
{
Return array(strtolower(str_replace('.php', '', str_replace($extension, '', $filename)).$extension));
}
else
{
foreach ($filename as $key => $val)
{
$filename[$key] = strtolower(str_replace('.php', '', str_replace($extension, '', $val)).$extension);
}
Return $filename;
}
}
}

How to change the default template address with the ci framework?

application/core/MY_Load.php
MY_ is the prefix in application/config/config.php $config['subclass_prefix'] = 'MY_'; setting
class MY_Loader extends CI_Loader{public function __construct( ){parent::__construct();$this->_ci_view_paths = array(FCPATH.'/templates/'=> TRUE);}}//FCPATH is a file directory at the same level as application, system, index.php Now create a new templates directory in the directory at the same level as application and system. This directory is the modified template directory

Problems encountered in the php CI framework

Prompt Fatal error: Class 'Test_model' not found in D:\wamp\www\CodeIgniter_2.1.2\system\core\Loader.php on line 303
It means that this Test_model class cannot be found
you The class name is written wrong, of course it cannot be found
The following is the model code, the file name is test_model.php: (The class name must be consistent with the file name)

class Test_m extends CI_Model{ / / It is best to change all capital letters to test_model
The following is the contraller code, the file name is user.php
$this->load->model('test_model'); It cannot be found when loading class test_model

This should be successful

http://www.bkjia.com/PHPjc/906120.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/906120.htmlTechArticleCI framework loader Loader.php source code analysis, ciloader.php As the name suggests, the loader loads elements, using CI When loading, the following are often loaded: $this-load-library() $this-load-view() $t...