CodeIgniter 核心代码阅读-加载语言包Lang.php

Lang.php--加载语言包Lang.php

<?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');

class CI_Lang {

	
	var $language	= array();
	
	var $is_loaded	= array();

	function __construct()
	{
		log_message('debug', "Language Class Initialized");
	}

	//加载语言包
	function load($langfile = '', $idiom = '', $return = FALSE, $add_suffix = TRUE, $alt_path = '')
	{
		$langfile = str_replace('.php', '', $langfile);

		if ($add_suffix == TRUE)
		{
			$langfile = str_replace('_lang.', '', $langfile).'_lang';
		}

		$langfile .= '.php';

		if (in_array($langfile, $this->is_loaded, TRUE))
		{
			return;
		}

		$config =& get_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
		if ($alt_path != '' && file_exists($alt_path.'language/'.$idiom.'/'.$langfile))
		{
			include($alt_path.'language/'.$idiom.'/'.$langfile);
		}
		else
		{
			$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 ($found !== TRUE)
			{
				show_error('Unable to load the requested language file: language/'.$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;
	}

	//从language数组中取出一条数据
	function line($line = '')
	{
		$value = ($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;
	}

}