421 lines
9.5 KiB
PHP
421 lines
9.5 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 4.3.2 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 - 2010, 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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* 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
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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($file, '/').'/'.md5(rand(1,100));
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if (($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($fp);
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return TRUE;
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}
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// ------------------------------------------------------------------------
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/**
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* Class registry
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*
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* This function acts as a singleton. If the requested class does not
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* exist it is instantiated and set to a static variable. If it has
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* previously been instantiated the variable is returned.
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*
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* @access public
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* @param string the class name being requested
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* @param bool optional flag that lets classes get loaded but not instantiated
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* @return object
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*/
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function &load_class($class, $instantiate = TRUE)
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{
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static $objects = array();
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// Does the class exist? If so, we're done...
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if (isset($objects[$class]))
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{
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return $objects[$class];
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}
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// If the requested class does not exist in the application/libraries
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// folder we'll load the native class from the system/libraries folder.
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if (file_exists(APPPATH.'libraries/'.config_item('subclass_prefix').$class.EXT))
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{
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require(BASEPATH.'libraries/'.$class.EXT);
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require(APPPATH.'libraries/'.config_item('subclass_prefix').$class.EXT);
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$is_subclass = TRUE;
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}
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else
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{
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if (file_exists(APPPATH.'libraries/'.$class.EXT))
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{
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require(APPPATH.'libraries/'.$class.EXT);
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$is_subclass = FALSE;
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}
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else
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{
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require(BASEPATH.'libraries/'.$class.EXT);
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$is_subclass = FALSE;
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}
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}
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if ($instantiate == FALSE)
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{
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$objects[$class] = TRUE;
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return $objects[$class];
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}
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if ($is_subclass == TRUE)
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{
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$name = config_item('subclass_prefix').$class;
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$objects[$class] =& instantiate_class(new $name());
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return $objects[$class];
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}
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$name = ($class != 'Controller') ? 'CI_'.$class : $class;
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$objects[$class] =& instantiate_class(new $name());
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return $objects[$class];
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}
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/**
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* Instantiate Class
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*
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* Returns a new class object by reference, used by load_class() and the DB class.
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* Required to retain PHP 4 compatibility and also not make PHP 5.3 cry.
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*
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* Use: $obj =& instantiate_class(new Foo());
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*
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* @access public
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* @param object
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* @return object
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*/
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function &instantiate_class(&$class_object)
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{
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return $class_object;
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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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* @access private
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* @return array
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*/
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function &get_config()
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{
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static $main_conf;
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if ( ! isset($main_conf))
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{
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if ( ! file_exists(APPPATH.'config/config'.EXT))
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{
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exit('The configuration file config'.EXT.' does not exist.');
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}
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require(APPPATH.'config/config'.EXT);
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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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$main_conf[0] =& $config;
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}
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return $main_conf[0];
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}
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/**
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* Gets a config item
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*
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* @access public
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* @return mixed
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*/
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function config_item($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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* 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, $status_code = 500)
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{
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$error =& load_class('Exceptions');
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echo $error->show_error('An Error Was Encountered', $message, 'error_general', $status_code);
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exit;
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}
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/**
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* 404 Page Handler
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*
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* This function is similar to the show_error() function above
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* However, instead of the standard error template it displays
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* 404 errors.
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*
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* @access public
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* @return void
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*/
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function show_404($page = '')
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{
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$error =& load_class('Exceptions');
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$error->show_404($page);
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exit;
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}
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/**
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* Error Logging Interface
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*
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* We use this as a simple mechanism to access the logging
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* class and send messages to be logged.
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*
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* @access public
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* @return void
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*/
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function log_message($level = 'error', $message, $php_error = FALSE)
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{
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static $LOG;
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$config =& get_config();
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if ($config['log_threshold'] == 0)
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{
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return;
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}
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$LOG =& load_class('Log');
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$LOG->write_log($level, $message, $php_error);
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}
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/**
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* Set HTTP Status Header
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*
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* @access public
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* @param int the status code
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* @param string
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* @return void
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*/
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function set_status_header($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, $code);
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}
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}
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/**
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* Exception Handler
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*
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* This is the custom exception handler that is declaired at the top
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* of Codeigniter.php. The main reason we use this is permit
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* PHP errors to be logged in our own log files since we may
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* not have access to server logs. Since this function
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* effectively intercepts PHP errors, however, we also need
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* to display errors based on the current error_reporting level.
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* We do that with the use of a PHP error template.
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*
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* @access private
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* @return void
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*/
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function _exception_handler($severity, $message, $filepath, $line)
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{
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// We don't bother with "strict" notices since they will fill up
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// the log file with information that isn't normally very
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// helpful. For example, if you are running PHP 5 and you
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// use version 4 style class functions (without prefixes
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// like "public", "private", etc.) you'll get notices telling
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// you that these have been deprecated.
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if ($severity == E_STRICT)
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{
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return;
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}
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$error =& load_class('Exceptions');
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// Should we display the error?
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// We'll get the current error_reporting level and add its bits
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// with the severity bits to find out.
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if (($severity & error_reporting()) == $severity)
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{
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$error->show_php_error($severity, $message, $filepath, $line);
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}
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// Should we log the error? No? We're done...
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$config =& get_config();
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if ($config['log_threshold'] == 0)
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{
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return;
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}
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$error->log_exception($severity, $message, $filepath, $line);
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}
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/* End of file Common.php */
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/* Location: ./system/codeigniter/Common.php */ |