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CI framework source code reading---------Lang.php_PHP tutorial

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Release： 2016-07-14 10:09:18
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[php]  

/** 
 * CodeIgniter 
 * 
 * An open source application development framework for PHP 5.1.6 or newer 
 * 
 * @package     CodeIgniter 
 * @author      ExpressionEngine Dev Team 
 * @copyright   Copyright (c) 2008 - 2011, EllisLab, Inc. 
 * @license     http://codeigniter.com/user_guide/license.html 
 * @link        http://codeigniter.com 
 * @since       Version 1.0 
 * @filesource 
 */  
  
// ------------------------------------------------------------------------  
  
/**
* Language Class
* Official user manual: http://codeigniter.org.cn/user_guide/libraries/language.html
* @package CodeIgniter
* @subpackage Libraries
* @category Language
* @author ExpressionEngine Dev Team
* @link http://codeigniter.com/user_guide/libraries/language.html
*/  
class CI_Lang {  
  
    /**
* List of translations
* Language pack list
* @var array
*/  
    var $language   = array();  
    /**
* List of loaded language files
* List of loaded language packs
* @var array
*/  
    var $is_loaded  = array();  
  
    /** 
     * Constructor 
     *  
     * @access  public 
     */  
    function __construct()  
    {  
        log_message('debug', "Language Class Initialized");  
    }  
  
    // --------------------------------------------------------------------  
  
    /**
* Load a language file
* Load language pack
* @access public
* @param mixed the name of the language file to be loaded. Can be an array
* * The language file to be loaded.
* @param string the language (english, etc.) The language to use
* @param bool return loaded array of translations Directly return the language pack array
* Do not add to $ this-& gt; is_loaded and $ this-& gt; language to
* @param bool add suffix to $langfile Whether to add a suffix to the file
* @param string alternative path to look for language file Custom path to language pack file
* @return mixed
*/  
    function load($langfile = '', $idiom = '', $return = FALSE, $add_suffix = TRUE, $alt_path = '')  
    {  
        // langfile 文件的.php 后缀去掉  
        $langfile = str_replace('.php', '', $langfile);  
  
        // 判断需不需要添加后缀如果需要  
        // 将_lang. 去掉并再langfile后面添加_lang  
        if ($add_suffix == TRUE)  
        {  
$langfile = str_replace('_lang.', '', $langfile).'_lang';
} }
// Add .php suffix to langfile
$langfile .= '.php';
// Determine whether the current file has been loaded
if (in_array($langfile, $this->is_loaded, TRUE))
{
return;
} }
// Get configuration file data
$config =& get_config();
// If the language to be used is empty
// Then we will get it from $config
if ($idiom == '')
{
$deft_lang = ( ! isset($config['language'])) ? 'english' : $config['language'];
$idiom = ($deft_lang == '') ? 'english' : $deft_lang;
} }
// Determine where the language file is and load it
// Find the language pack under the custom path and load it
if ($alt_path != '' && file_exists($alt_path.'language/'.$idiom.'/'.$langfile))
{
include($alt_path.'language/'.$idiom.'/'.$langfile);
} }
else
{
                                  // If the custom path is not found, call get_instance()->load->get_package_paths(TRUE)
// Find
under the path path
                                                                                                                                                                                                                                                                                                 
$found = FALSE;
foreach (get_instance()->load->get_package_paths(TRUE) as $package_path)
                                                                 
                    if (file_exists($package_path.'language/'.$idiom.'/'.$langfile))  
                                                                         
                          include($package_path.'language/'.$idiom.'/'.$langfile);  
$found = TRUE;
break;
        }  
      }  
                                                                     
// If you haven't found it, you can only report an error
                 //                                         
if ($found !== TRUE)
                                                                 
show_error('Unable to load the requested language file: language/'.$idiom.'/'.$langfile);
      }  
} }
if ( ! isset($lang))
{
log_message('error', 'Language file contains no data: language/'.$idiom.'/'.$langfile);
return;
} }
if ($return == TRUE)
{
            return $lang;  
        }  
  
        $this->is_loaded[] = $langfile;  
        $this->language = array_merge($this->language, $lang);  
        unset($lang);  
  
        log_message('debug', 'Language file loaded: language/'.$idiom.'/'.$langfile);  
        return TRUE;  
    }  
  
    // --------------------------------------------------------------------  
  
    /** 
     * Fetch a single line of text from the language array 
     * 获取一行文本 
     * @access  public 
     * @param   string  $line   the language line 
     * @return  string 
     */  
    function line($line = '')  
    {  
        /* 
         *  $this->language 的样子 
         *  $lang['error_email_missing'] = "You must submit an email address"; 
         *  $lang['error_url_missing'] = "You must submit a URL"; 
         *  $lang['error_username_missing'] = "You must submit a username"; 
         */  
        $value = ($line == '' OR ! isset($this->language[$line])) ? FALSE : $this->language[$line];  
  
        // Because killer robots like unicorns!  
        if ($value === FALSE)  
        {  
            log_message('error', 'Could not find the language line "'.$line.'"');  
        }  
  
        return $value;  
    }  
  
}  
// END Language Class  
  
/* End of file Lang.php */  
/* Location: ./system/core/Lang.php */  
 

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