<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed'); /** * CodeIgniter * * An open source application development framework for PHP 5.2.4 or newer * * NOTICE OF LICENSE * * Licensed under the Open Software License version 3.0 * * This source file is subject to the Open Software License (OSL 3.0) that is * bundled with this package in the files license.txt / license.rst. It is * also available through the world wide web at this URL: * http://opensource.org/licenses/OSL-3.0 * If you did not receive a copy of the license and are unable to obtain it * through the world wide web, please send an email to * licensing@ellislab.com so we can send you a copy immediately. * * @package CodeIgniter * @author EllisLab Dev Team * @copyright Copyright (c) 2008 - 2012, EllisLab, Inc. (http://ellislab.com/) * @license http://opensource.org/licenses/OSL-3.0 Open Software License (OSL 3.0) * @link http://codeigniter.com * @since Version 1.0 * @filesource */ /** * Common Functions * * Loads the base classes and executes the request. * * @package CodeIgniter * @subpackage CodeIgniter * @category Common Functions * @author EllisLab Dev Team * @link http://codeigniter.com/user_guide/ */ // ------------------------------------------------------------------------ if ( ! function_exists('is_php')) { /** * Determines if the current version of PHP is greater then the supplied value * * Since there are a few places where we conditionally test for PHP > 5 * we'll set a static variable. * * @param string * @return bool TRUE if the current version is $version or higher */ function is_php($version = '5.0.0') { static $_is_php; $version = (string) $version; if ( ! isset($_is_php[$version])) { $_is_php[$version] = (version_compare(PHP_VERSION, $version) >= 0); } return $_is_php[$version]; } } // ------------------------------------------------------------------------ if ( ! function_exists('is_really_writable')) { /** * Tests for file writability * * is_writable() returns TRUE on Windows servers when you really can't write to * the file, based on the read-only attribute. is_writable() is also unreliable * on Unix servers if safe_mode is on. * * @param string * @return void */ function is_really_writable($file) { // If we're on a Unix server with safe_mode off we call is_writable if (DIRECTORY_SEPARATOR === '/' && (bool) @ini_get('safe_mode') === FALSE) { return is_writable($file); } /* For Windows servers and safe_mode "on" installations we'll actually * write a file then read it. Bah... */ if (is_dir($file)) { $file = rtrim($file, '/').'/'.md5(mt_rand(1,100).mt_rand(1,100)); if (($fp = @fopen($file, FOPEN_WRITE_CREATE)) === FALSE) { return FALSE; } fclose($fp); @chmod($file, DIR_WRITE_MODE); @unlink($file); return TRUE; } elseif ( ! is_file($file) OR ($fp = @fopen($file, FOPEN_WRITE_CREATE)) === FALSE) { return FALSE; } fclose($fp); return TRUE; } } // ------------------------------------------------------------------------ if ( ! function_exists('load_class')) { /** * Class registry * * This function acts as a singleton. If the requested class does not * exist it is instantiated and set to a static variable. If it has * previously been instantiated the variable is returned. * * @param string the class name being requested * @param string the directory where the class should be found * @param string the class name prefix * @return object */ function &load_class($class, $directory = 'libraries', $prefix = 'CI_') { static $_classes = array(); // Does the class exist? If so, we're done... if (isset($_classes[$class])) { return $_classes[$class]; } $name = FALSE; // Look for the class first in the local application/libraries folder // then in the native system/libraries folder foreach (array(APPPATH, BASEPATH) as $path) { if (file_exists($path.$directory.'/'.$class.'.php')) { $name = $prefix.$class; if (class_exists($name) === FALSE) { require($path.$directory.'/'.$class.'.php'); } break; } } // Is the request a class extension? If so we load it too if (file_exists(APPPATH.$directory.'/'.config_item('subclass_prefix').$class.'.php')) { $name = config_item('subclass_prefix').$class; if (class_exists($name) === FALSE) { require(APPPATH.$directory.'/'.config_item('subclass_prefix').$class.'.php'); } } // Did we find the class? if ($name === FALSE) { // Note: We use exit() rather then show_error() in order to avoid a // self-referencing loop with the Excptions class set_status_header(503); exit('Unable to locate the specified class: '.$class.'.php'); } // Keep track of what we just loaded is_loaded($class); $_classes[$class] = new $name(); return $_classes[$class]; } } // -------------------------------------------------------------------- if ( ! function_exists('is_loaded')) { /** * Keeps track of which libraries have been loaded. This function is * called by the load_class() function above * * @param string * @return array */ function &is_loaded($class = '') { static $_is_loaded = array(); if ($class !== '') { $_is_loaded[strtolower($class)] = $class; } return $_is_loaded; } } // ------------------------------------------------------------------------ if ( ! function_exists('get_config')) { /** * Loads the main config.php file * * This function lets us grab the config file even if the Config class * hasn't been instantiated yet * * @param array * @return array */ function &get_config($replace = array()) { static $_config; if (isset($_config)) { return $_config[0]; } $file_path = APPPATH.'config/config.php'; $found = FALSE; if (file_exists($file_path)) { $found = TRUE; require($file_path); } // Is the config file in the environment folder? if (defined(ENVIRONMENT) && file_exists($file_path = APPPATH.'config/'.ENVIRONMENT.'/config.php')) { require($file_path); } elseif ( ! $found) { set_status_header(503); exit('The configuration file does not exist.'); } // Does the $config array exist in the file? if ( ! isset($config) OR ! is_array($config)) { set_status_header(503); exit('Your config file does not appear to be formatted correctly.'); } // Are any values being dynamically replaced? if (count($replace) > 0) { foreach ($replace as $key => $val) { if (isset($config[$key])) { $config[$key] = $val; } } } return $_config[0] =& $config; } } // ------------------------------------------------------------------------ if ( ! function_exists('config_item')) { /** * Returns the specified config item * * @param string * @return mixed */ function config_item($item) { static $_config_item = array(); if ( ! isset($_config_item[$item])) { $config =& get_config(); if ( ! isset($config[$item])) { return FALSE; } $_config_item[$item] = $config[$item]; } return $_config_item[$item]; } } // ------------------------------------------------------------------------ if ( ! function_exists('show_error')) { /** * Error Handler * * This function lets us invoke the exception class and * display errors using the standard error template located * in application/errors/errors.php * This function will send the error page directly to the * browser and exit. * * @param string * @param int * @param string * @return void */ function show_error($message, $status_code = 500, $heading = 'An Error Was Encountered') { $_error =& load_class('Exceptions', 'core'); echo $_error->show_error($heading, $message, 'error_general', $status_code); exit; } } // ------------------------------------------------------------------------ if ( ! function_exists('show_404')) { /** * 404 Page Handler * * This function is similar to the show_error() function above * However, instead of the standard error template it displays * 404 errors. * * @param string * @param bool * @return void */ function show_404($page = '', $log_error = TRUE) { $_error =& load_class('Exceptions', 'core'); $_error->show_404($page, $log_error); exit; } } // ------------------------------------------------------------------------ if ( ! function_exists('log_message')) { /** * Error Logging Interface * * We use this as a simple mechanism to access the logging * class and send messages to be logged. * * @param string * @param string * @param bool * @return void */ function log_message($level = 'error', $message, $php_error = FALSE) { static $_log; if (config_item('log_threshold') === 0) { return; } $_log =& load_class('Log'); $_log->write_log($level, $message, $php_error); } } // ------------------------------------------------------------------------ if ( ! function_exists('set_status_header')) { /** * Set HTTP Status Header * * @param int the status code * @param string * @return void */ function set_status_header($code = 200, $text = '') { $stati = array( 200 => 'OK', 201 => 'Created', 202 => 'Accepted', 203 => 'Non-Authoritative Information', 204 => 'No Content', 205 => 'Reset Content', 206 => 'Partial Content', 300 => 'Multiple Choices', 301 => 'Moved Permanently', 302 => 'Found', 304 => 'Not Modified', 305 => 'Use Proxy', 307 => 'Temporary Redirect', 400 => 'Bad Request', 401 => 'Unauthorized', 403 => 'Forbidden', 404 => 'Not Found', 405 => 'Method Not Allowed', 406 => 'Not Acceptable', 407 => 'Proxy Authentication Required', 408 => 'Request Timeout', 409 => 'Conflict', 410 => 'Gone', 411 => 'Length Required', 412 => 'Precondition Failed', 413 => 'Request Entity Too Large', 414 => 'Request-URI Too Long', 415 => 'Unsupported Media Type', 416 => 'Requested Range Not Satisfiable', 417 => 'Expectation Failed', 422 => 'Unprocessable Entity', 500 => 'Internal Server Error', 501 => 'Not Implemented', 502 => 'Bad Gateway', 503 => 'Service Unavailable', 504 => 'Gateway Timeout', 505 => 'HTTP Version Not Supported' ); if ($code == '' OR ! is_numeric($code)) { show_error('Status codes must be numeric', 500); } elseif (isset($stati[$code]) && $text === '') { $text = $stati[$code]; } if ($text === '') { show_error('No status text available. Please check your status code number or supply your own message text.', 500); } $server_protocol = isset($_SERVER['SERVER_PROTOCOL']) ? $_SERVER['SERVER_PROTOCOL'] : FALSE; if (strpos(php_sapi_name(), 'cgi') === 0) { header('Status: '.$code.' '.$text, TRUE); } elseif ($server_protocol === 'HTTP/1.0') { header('HTTP/1.0 '.$code.' '.$text, TRUE, $code); } else { header('HTTP/1.1 '.$code.' '.$text, TRUE, $code); } } } // -------------------------------------------------------------------- if ( ! function_exists('_exception_handler')) { /** * Exception Handler * * This is the custom exception handler that is declaired at the top * of Codeigniter.php. The main reason we use this is to permit * PHP errors to be logged in our own log files since the user may * not have access to server logs. Since this function * effectively intercepts PHP errors, however, we also need * to display errors based on the current error_reporting level. * We do that with the use of a PHP error template. * * @param int * @param string * @param string * @param int * @return void */ function _exception_handler($severity, $message, $filepath, $line) { $_error =& load_class('Exceptions', 'core'); // Should we display the error? We'll get the current error_reporting // level and add its bits with the severity bits to find out. if (($severity & error_reporting()) === $severity) { $_error->show_php_error($severity, $message, $filepath, $line); } // Should we log the error? No? We're done... if (config_item('log_threshold') === 0) { return; } $_error->log_exception($severity, $message, $filepath, $line); } } // -------------------------------------------------------------------- if ( ! function_exists('remove_invisible_characters')) { /** * Remove Invisible Characters * * This prevents sandwiching null characters * between ascii characters, like Java\0script. * * @param string * @param bool * @return string */ function remove_invisible_characters($str, $url_encoded = TRUE) { $non_displayables = array(); // every control character except newline (dec 10), // carriage return (dec 13) and horizontal tab (dec 09) if ($url_encoded) { $non_displayables[] = '/%0[0-8bcef]/'; // url encoded 00-08, 11, 12, 14, 15 $non_displayables[] = '/%1[0-9a-f]/'; // url encoded 16-31 } $non_displayables[] = '/[\x00-\x08\x0B\x0C\x0E-\x1F\x7F]+/S'; // 00-08, 11, 12, 14-31, 127 do { $str = preg_replace($non_displayables, '', $str, -1, $count); } while ($count); return $str; } } // ------------------------------------------------------------------------ if ( ! function_exists('html_escape')) { /** * Returns HTML escaped variable * * @param mixed * @return mixed */ function html_escape($var) { return is_array($var) ? array_map('html_escape', $var) : htmlspecialchars($var, ENT_QUOTES, config_item('charset')); } } /* End of file Common.php */ /* Location: ./system/core/Common.php */