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[PHP] CI框架源码完全分析之核心文件Common.php

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  • 发表于 2014-3-27 00:19:00 | 显示全部楼层 |阅读模式
    CI框架core/Common.php中都是一些公共的函数,如:
  • is_really_writable() 兼容windows/linux的判断文件是否有写入权限
  • is_php()  判断php的版本
  • load_class()  加载并实例化类
  • get_config() 获取配置文件,返回配置数组
  • config_item() 返回配置文件中的一个信息
  • show_error() 错误处理
  • show_404()  404处理
  • log_message() 消息日志记录
  • _exception_handler()  异常或错误处理
  • set_status_header 响应头
  • 等等
    0) { foreach ($replace as $key => $val) { if (isset($config[$key])) { $config[$key] = $val; } } } return $_config[0] =& $config; } } // ------------------------------------------------------------------------ /** * 这个就简单啦,返回配置数组中某个键名的配置值 * * @access public * @return mixed */ if ( ! function_exists('config_item')) { function config_item($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]; } } // ------------------------------------------------------------------------ /** * 错误处理 * * 直接显示错误信息到浏览器,都是使用core/Exception.php的方法 * 默认的view文件 application/errors/errors.php * * @access public * @return void */ if ( ! function_exists('show_error')) { 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', $status_code); exit; } } // ------------------------------------------------------------------------ /** * 404页面处理 * 如上相同 * * @access public * @return void */ if ( ! function_exists('show_404')) { function show_404($page = '', $log_error = TRUE) { $_error =& load_class('Exceptions', 'core'); $_error->show_404($page, $log_error); exit; } } // ------------------------------------------------------------------------ /** * 记录错误日志,默认是libraries/log.php类库处理 * * @access public * @return void */ if ( ! function_exists('log_message')) { function log_message($level = 'error', $message, $php_error = FALSE) { static $_log; if (config_item('log_threshold') == 0) { return; } $_log =& load_class('Log'); $_log->write_log($level, $message, $php_error); } } // ------------------------------------------------------------------------ /** * 响应一个http头,数组是常见的http头的状态码 * * @access public * @param int the status code * @param string * @return void */ if ( ! function_exists('set_status_header')) { function set_status_header($code = 200, $text = '') { $stati = array( 200 => 'OK', 201 => 'Created', 202 => 'Accepted', 203 => 'Non-Authoritative Information', 204 => 'No Content', 205 => 'Reset Content', 206 => 'Partial Content', 300 => 'Multiple Choices', 301 => 'Moved Permanently', 302 => 'Found', 304 => 'Not Modified', 305 => 'Use Proxy', 307 => 'Temporary Redirect', 400 => 'Bad Request', 401 => 'Unauthorized', 403 => 'Forbidden', 404 => 'Not Found', 405 => 'Method Not Allowed', 406 => 'Not Acceptable', 407 => 'Proxy Authentication Required', 408 => 'Request Timeout', 409 => 'Conflict', 410 => 'Gone', 411 => 'Length Required', 412 => 'Precondition Failed', 413 => 'Request Entity Too Large', 414 => 'Request-URI Too Long', 415 => 'Unsupported Media Type', 416 => 'Requested Range Not Satisfiable', 417 => 'Expectation Failed', 500 => 'Internal Server Error', 501 => 'Not Implemented', 502 => 'Bad Gateway', 503 => 'Service Unavailable', 504 => 'Gateway Timeout', 505 => 'HTTP Version Not Supported' ); if ($code == '' OR ! is_numeric($code)) { show_error('Status codes must be numeric', 500); } if (isset($stati[$code]) AND $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'])) ? $_SERVER['SERVER_PROTOCOL'] : FALSE; if (substr(php_sapi_name(), 0, 3) == 'cgi') { header("Status: {$code} {$text}", TRUE); } elseif ($server_protocol == 'HTTP/1.1' OR $server_protocol == 'HTTP/1.0') { header($server_protocol." {$code} {$text}", TRUE, $code); } else { header("HTTP/1.1 {$code} {$text}", TRUE, $code); } } } // -------------------------------------------------------------------- /** * 异常或错误出力 * * @access private * @return void */ if ( ! function_exists('_exception_handler')) { function _exception_handler($severity, $message, $filepath, $line) { //E_STRICT的错误信息没用就不要了 if ($severity == E_STRICT) { return; } $_error =& load_class('Exceptions', 'core'); //这里是位运算哦,你可以看看PHP的错误级别(http://www.phpddt.com/php/error_reporting.html) //很显然1,2,4,8...(1,10,100,1000)中任意一个与1111进行&都是它本身,根据结果显示错误 if (($severity & error_reporting()) == $severity) { $_error->show_php_error($severity, $message, $filepath, $line); } //根据配置信息是否记录错误信息日志 if (config_item('log_threshold') == 0) { return; } $_error->log_exception($severity, $message, $filepath, $line); } } // -------------------------------------------------------------------- /** * 防止在ASCII字符之间插入空字符,如Java\0script. * * @access public * @param string * @return string */ if ( ! function_exists('remove_invisible_characters')) { function remove_invisible_characters($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 $str; } } // ------------------------------------------------------------------------ /** * 将特殊字符转化成html实体,如单引号,双引号等 * * @access public * @param mixed * @return mixed */ if ( ! function_exists('html_escape')) { function html_escape($var) { if (is_array($var)) { return array_map('html_escape', $var); } else { return htmlspecialchars($var, ENT_QUOTES, config_item('charset')); } } }
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