508 行
无行尾
12 KiB
PHP
508 行
无行尾
12 KiB
PHP
<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
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/**
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* CodeIgniter
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*
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* An open source application development framework for PHP 5.1.6 or newer
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*
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* @package CodeIgniter
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* @author ExpressionEngine Dev Team
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* @copyright Copyright (c) 2008 - 2011, EllisLab, Inc.
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* @license http://codeigniter.com/user_guide/license.html
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* @link http://codeigniter.com
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* @since Version 1.0
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* @filesource
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*/
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// ------------------------------------------------------------------------
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/**
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* Common Functions
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*
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* Loads the base classes and executes the request.
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*
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* @package CodeIgniter
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* @subpackage codeigniter
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* @category Common Functions
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* @author ExpressionEngine Dev Team
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* @link http://codeigniter.com/user_guide/
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*/
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// ------------------------------------------------------------------------
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/**
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* Determines if the current version of PHP is greater then the supplied value
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*
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* Since there are a few places where we conditionally test for PHP > 5
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* we'll set a static variable.
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*
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* @access public
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* @param string
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* @return bool TRUE if the current version is $version or higher
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*/
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function is_php($version = '5.0.0')
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{
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static $_is_php;
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$version = (string)$version;
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if ( ! isset($_is_php[$version]))
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{
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$_is_php[$version] = (version_compare(PHP_VERSION, $version) < 0) ? FALSE : TRUE;
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}
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return $_is_php[$version];
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}
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// ------------------------------------------------------------------------
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/**
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* Tests for file writability
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*
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* is_writable() returns TRUE on Windows servers when you really can't write to
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* the file, based on the read-only attribute. is_writable() is also unreliable
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* on Unix servers if safe_mode is on.
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*
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* @access private
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* @return void
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*/
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function is_really_writable($file)
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{
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// If we're on a Unix server with safe_mode off we call is_writable
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if (DIRECTORY_SEPARATOR == '/' AND @ini_get("safe_mode") == FALSE)
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{
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return is_writable($file);
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}
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// For windows servers and safe_mode "on" installations we'll actually
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// write a file then read it. Bah...
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if (is_dir($file))
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{
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$file = rtrim($file, '/').'/'.md5(mt_rand(1,100).mt_rand(1,100));
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if (($fp = @fopen($file, FOPEN_WRITE_CREATE)) === FALSE)
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{
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return FALSE;
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}
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fclose($fp);
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@chmod($file, DIR_WRITE_MODE);
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@unlink($file);
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return TRUE;
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}
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elseif (($fp = @fopen($file, FOPEN_WRITE_CREATE)) === FALSE)
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{
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return FALSE;
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}
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fclose($fp);
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return TRUE;
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}
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// ------------------------------------------------------------------------
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/**
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* Class registry
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*
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* This function acts as a singleton. If the requested class does not
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* exist it is instantiated and set to a static variable. If it has
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* previously been instantiated the variable is returned.
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*
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* @access public
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* @param string the class name being requested
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* @param string the directory where the class should be found
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* @param string the class name prefix
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* @return object
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*/
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function &load_class($class, $directory = 'libraries', $prefix = 'CI_')
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{
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static $_classes = array();
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// Does the class exist? If so, we're done...
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if (isset($_classes[$class]))
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{
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return $_classes[$class];
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}
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$name = FALSE;
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// Look for the class first in the native system/libraries folder
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// thenin the local application/libraries folder
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foreach (array(BASEPATH, APPPATH) as $path)
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{
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if (file_exists($path.$directory.'/'.$class.EXT))
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{
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$name = $prefix.$class;
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if (class_exists($name) === FALSE)
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{
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require($path.$directory.'/'.$class.EXT);
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}
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break;
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}
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}
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// Is the request a class extension? If so we load it too
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if (file_exists(APPPATH.$directory.'/'.config_item('subclass_prefix').$class.EXT))
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{
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$name = config_item('subclass_prefix').$class;
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if (class_exists($name) === FALSE)
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{
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require(APPPATH.$directory.'/'.config_item('subclass_prefix').$class.EXT);
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}
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}
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// Did we find the class?
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if ($name === FALSE)
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{
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// Note: We use exit() rather then show_error() in order to avoid a
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// self-referencing loop with the Excptions class
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exit('Unable to locate the specified class: '.$class.EXT);
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}
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// Keep track of what we just loaded
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is_loaded($class);
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$_classes[$class] = new $name();
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return $_classes[$class];
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}
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// --------------------------------------------------------------------
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/**
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* Keeps track of which libraries have been loaded. This function is
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* called by the load_class() function above
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*
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* @access public
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* @return array
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*/
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function is_loaded($class = '')
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{
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static $_is_loaded = array();
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if ($class != '')
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{
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$_is_loaded[strtolower($class)] = $class;
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}
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return $_is_loaded;
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}
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// ------------------------------------------------------------------------
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/**
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* Loads the main config.php file
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*
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* This function lets us grab the config file even if the Config class
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* hasn't been instantiated yet
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*
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* @access private
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* @return array
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*/
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function &get_config($replace = array())
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{
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static $_config;
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if (isset($_config))
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{
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return $_config[0];
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}
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$file_path = APPPATH.'config/'.ENVIRONMENT.'/config'.EXT;
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// Fetch the config file
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if ( ! file_exists($file_path))
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{
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$file_path = APPPATH.'config/config'.EXT;
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if ( ! file_exists($file_path))
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{
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exit('The configuration file does not exist.');
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}
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}
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require($file_path);
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// Does the $config array exist in the file?
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if ( ! isset($config) OR ! is_array($config))
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{
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exit('Your config file does not appear to be formatted correctly.');
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}
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// Are any values being dynamically replaced?
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if (count($replace) > 0)
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{
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foreach ($replace as $key => $val)
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{
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if (isset($config[$key]))
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{
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$config[$key] = $val;
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}
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}
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}
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return $_config[0] =& $config;
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}
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// ------------------------------------------------------------------------
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/**
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* Returns the specified config item
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*
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* @access public
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* @return mixed
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*/
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function config_item($item)
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{
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static $_config_item = array();
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if ( ! isset($_config_item[$item]))
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{
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$config =& get_config();
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if ( ! isset($config[$item]))
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{
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return FALSE;
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}
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$_config_item[$item] = $config[$item];
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}
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return $_config_item[$item];
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}
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// ------------------------------------------------------------------------
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/**
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* Error Handler
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*
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* This function lets us invoke the exception class and
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* display errors using the standard error template located
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* in application/errors/errors.php
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* This function will send the error page directly to the
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* browser and exit.
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*
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* @access public
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* @return void
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*/
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function show_error($message, $status_code = 500, $heading = 'An Error Was Encountered')
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{
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$_error =& load_class('Exceptions', 'core');
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echo $_error->show_error($heading, $message, 'error_general', $status_code);
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exit;
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}
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// ------------------------------------------------------------------------
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/**
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* 404 Page Handler
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*
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* This function is similar to the show_error() function above
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* However, instead of the standard error template it displays
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* 404 errors.
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*
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* @access public
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* @return void
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*/
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function show_404($page = '', $log_error = TRUE)
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{
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$_error =& load_class('Exceptions', 'core');
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$_error->show_404($page, $log_error);
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exit;
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}
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// ------------------------------------------------------------------------
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/**
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* Error Logging Interface
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*
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* We use this as a simple mechanism to access the logging
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* class and send messages to be logged.
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*
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* @access public
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* @return void
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*/
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function log_message($level = 'error', $message, $php_error = FALSE)
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{
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static $_log;
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if (config_item('log_threshold') == 0)
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{
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return;
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}
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$_log =& load_class('Log');
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$_log->write_log($level, $message, $php_error);
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}
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// ------------------------------------------------------------------------
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/**
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* Set HTTP Status Header
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*
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* @access public
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* @param int the status code
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* @param string
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* @return void
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*/
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function set_status_header($code = 200, $text = '')
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{
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$stati = array(
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200 => 'OK',
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201 => 'Created',
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202 => 'Accepted',
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203 => 'Non-Authoritative Information',
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204 => 'No Content',
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205 => 'Reset Content',
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206 => 'Partial Content',
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300 => 'Multiple Choices',
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301 => 'Moved Permanently',
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302 => 'Found',
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304 => 'Not Modified',
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305 => 'Use Proxy',
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307 => 'Temporary Redirect',
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400 => 'Bad Request',
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401 => 'Unauthorized',
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403 => 'Forbidden',
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404 => 'Not Found',
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405 => 'Method Not Allowed',
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406 => 'Not Acceptable',
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407 => 'Proxy Authentication Required',
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408 => 'Request Timeout',
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409 => 'Conflict',
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410 => 'Gone',
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411 => 'Length Required',
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412 => 'Precondition Failed',
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413 => 'Request Entity Too Large',
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414 => 'Request-URI Too Long',
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415 => 'Unsupported Media Type',
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416 => 'Requested Range Not Satisfiable',
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417 => 'Expectation Failed',
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500 => 'Internal Server Error',
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501 => 'Not Implemented',
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502 => 'Bad Gateway',
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503 => 'Service Unavailable',
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504 => 'Gateway Timeout',
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505 => 'HTTP Version Not Supported'
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);
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if ($code == '' OR ! is_numeric($code))
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{
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show_error('Status codes must be numeric', 500);
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}
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if (isset($stati[$code]) AND $text == '')
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{
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$text = $stati[$code];
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}
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if ($text == '')
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{
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show_error('No status text available. Please check your status code number or supply your own message text.', 500);
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}
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$server_protocol = (isset($_SERVER['SERVER_PROTOCOL'])) ? $_SERVER['SERVER_PROTOCOL'] : FALSE;
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if (substr(php_sapi_name(), 0, 3) == 'cgi')
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{
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header("Status: {$code} {$text}", TRUE);
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}
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elseif ($server_protocol == 'HTTP/1.1' OR $server_protocol == 'HTTP/1.0')
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{
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header($server_protocol." {$code} {$text}", TRUE, $code);
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}
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else
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{
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header("HTTP/1.1 {$code} {$text}", TRUE, $code);
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}
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}
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// --------------------------------------------------------------------
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/**
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* Exception Handler
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*
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* This is the custom exception handler that is declaired at the top
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* of Codeigniter.php. The main reason we use this is to permit
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* PHP errors to be logged in our own log files since the user may
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* not have access to server logs. Since this function
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* effectively intercepts PHP errors, however, we also need
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* to display errors based on the current error_reporting level.
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* We do that with the use of a PHP error template.
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*
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* @access private
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* @return void
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*/
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function _exception_handler($severity, $message, $filepath, $line)
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{
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// We don't bother with "strict" notices since they tend to fill up
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// the log file with excess information that isn't normally very helpful.
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// For example, if you are running PHP 5 and you use version 4 style
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// class functions (without prefixes like "public", "private", etc.)
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// you'll get notices telling you that these have been deprecated.
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if ($severity == E_STRICT)
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{
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return;
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}
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$_error =& load_class('Exceptions', 'core');
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// Should we display the error? We'll get the current error_reporting
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// level and add its bits with the severity bits to find out.
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if (($severity & error_reporting()) == $severity)
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{
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$_error->show_php_error($severity, $message, $filepath, $line);
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}
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// Should we log the error? No? We're done...
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if (config_item('log_threshold') == 0)
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{
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return;
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}
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$_error->log_exception($severity, $message, $filepath, $line);
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}
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// --------------------------------------------------------------------
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/**
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* Remove Invisible Characters
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*
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* This prevents sandwiching null characters
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* between ascii characters, like Java\0script.
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*
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* @access public
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* @param string
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* @return string
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*/
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function remove_invisible_characters($str)
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{
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static $non_displayables;
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if ( ! isset($non_displayables))
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{
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// every control character except newline (dec 10), carriage return (dec 13), and horizontal tab (dec 09),
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$non_displayables = array(
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'/%0[0-8bcef]/', // url encoded 00-08, 11, 12, 14, 15
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'/%1[0-9a-f]/', // url encoded 16-31
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'/[\x00-\x08]/', // 00-08
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'/\x0b/', '/\x0c/', // 11, 12
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'/[\x0e-\x1f]/' // 14-31
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);
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}
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do
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{
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$cleaned = $str;
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$str = preg_replace($non_displayables, '', $str);
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}
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while ($cleaned != $str);
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return $str;
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}
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/* End of file Common.php */
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/* Location: ./system/core/Common.php */ |