CI框架源码阅览-URI.php

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CI框架源码阅读———URI.php

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config =& load_class(Config, core);log_message(debug, "URI Class Initialized");}// --------------------------------/** * Get the URI String * * @accessprivate * @returnstring */function _fetch_uri_string(){// 下面的uri_protocol是在config.php里面的一个配置项，// 其实是问你用哪种方式去检测uri的信息的意思， // 默认是AUTO，自动检测，也就是通过各种方式检测，直至检测到，或者全部方式都检测完。。if (strtoupper($this->config->item(uri_protocol)) == AUTO){// Is the request coming from the command line?// 开始尝试各种方式,主要有：命令行，REQUEST_URI, PATH_INFO, QUERY_STRING. // 下面会多次出现$this->_set_uri_string($str)这个方法，这个方法没别的，就是把$str经过 // 过滤和修剪后值给$this->uri_string属性，在这里暂时可以理解为就是赋值。 // 如果脚本是在命令行模式下运行的话，那么参数就是通过$_SERVER[argv]来传递。下面的 // $this->_parse_cli_args();就是拿到符合我们需要的路由相关的一些参数// 如果你没用命令行执行脚本的话，下面这个if暂时可以不用管。// 这时候我们发现URI类用函数php_sapi_name()来测试不同的环境// 在apache环境下面输出的结果是“apache2handler”； // 在cgi模式下输出的结果是“cgi-fcgi” // 要是在命令行模式下面运行的话，那么输出的结果是：”cli” if (php_sapi_name() == cli or defined(STDIN)){$this->_set_uri_string($this->_parse_cli_args());return;}// Lets try the REQUEST_URI first, this will work in most situations// 查找uriif ($uri = $this->_detect_uri()){// 如果找到uri 设置$this->uri_string$this->_set_uri_string($uri);return;}// Is there a PATH_INFO variable? // Note: some servers seem 似乎 to have trouble 麻烦 with getenv() so well test it two ways// 获取path $_SERVER[PATH_INFO] 并不是每次请求都会有的所以当没有的时候使用getenv(PATH_INFO)$path = (isset($_SERVER[PATH_INFO])) ? $_SERVER[PATH_INFO] : @getenv(PATH_INFO);if (trim($path, /) != \ && $path != "/".SELF){$this->_set_uri_string($path);return;}// No PATH_INFO?... What about QUERY_STRING?// 如果没有找到$_SERVER[PATH_INFO] 我们使用QUERY_STRING$path = (isset($_SERVER[QUERY_STRING])) ? $_SERVER[QUERY_STRING] : @getenv(QUERY_STRING);if (trim($path, /) != \){$this->_set_uri_string($path);return;}// As a last ditch effort lets try using the $_GET array// 如果PATH_INFO和QUERY_STRING都没找到我们只能使用$_GETif (is_array($_GET) && count($_GET) == 1 && trim(key($_GET), /) != \){$this->_set_uri_string(key($_GET));return;}// Weve exhausted all our options...// 经过以上的努力我们还没有找到uri那么我们就真的找不到了$this->uri_string = \;return;}// 这里重新写了一遍获取uri_protocol 其实我觉得完全可以只获取一次嘛。。。$uri = strtoupper($this->config->item(uri_protocol));// 下面就是根据不同的方式来选择不同的办法获取uri了if ($uri == REQUEST_URI){$this->_set_uri_string($this->_detect_uri());return;}elseif ($uri == CLI){$this->_set_uri_string($this->_parse_cli_args());return;}// 如果你定义的uri_protocol是在AUTO REQUEST_URI CLI这三种方式之外的就执行下面这段了。 $path = (isset($_SERVER[$uri])) ? $_SERVER[$uri] : @getenv($uri);$this->_set_uri_string($path);}// --------------------------------/** * Set the URI String * * @accesspublic * @param string * @returnstring */function _set_uri_string($str){// Filter out control characters// 过滤字符串 remove_invisible_characters 函数式在common.php中$str = remove_invisible_characters($str, FALSE);// If the URI contains only a slash well kill it// 如果字符串只包含一个/则清空$this->uri_string = ($str == /) ? \ : $str;}// --------------------------------/** * Detects the URI * 查找uri * This function will detect the URI automatically and fix the query string * if necessary. 必需品 * 如果有必要的话，这个函数将自动查找uri并且固定查询字符串。 * * @accessprivate * @returnstring */private function _detect_uri(){// 如果两个值有一个没有则返回（两个变量是从web server那边来的,碰到一些特别的server程序, 这个是有可能为空的.）if ( ! isset($_SERVER[REQUEST_URI]) OR ! isset($_SERVER[SCRIPT_NAME])){return \;}// 获取uri$uri = $_SERVER[REQUEST_URI];// 如果SCRIPT_NAME 在$uri 中第一次出现的位置是0 if (strpos($uri, $_SERVER[SCRIPT_NAME]) === 0){// 去掉uri 和 SCRIPT_NAME 相同的部分$uri = substr($uri, strlen($_SERVER[SCRIPT_NAME]));}// 这里作用同上 只是将$_SERVER[SCRIPT_NAME]换成了// dirname($_SERVER[SCRIPT_NAME])elseif (strpos($uri, dirname($_SERVER[SCRIPT_NAME])) === 0){$uri = substr($uri, strlen(dirname($_SERVER[SCRIPT_NAME])));}// This section ensures 保证 that even on servers that require the URI// to be in the query string (Nginx) a correct 正确的// URI is found, and also fixes 修理 the QUERY_STRING server var and $_GET array.// 这部分保证，uri可以被正确的找到即使是在Nginx服务器上，并且还修复了的QUERY_STRING服务器和$ _GET数组。// 判断$uri的前两个字符是不是?/if (strncmp($uri, ?/, 2) === 0){// 去掉前两个字符$uri = substr($uri, 2);}// 用正册对字符串进行分割$parts = preg_split(#\?#i, $uri, 2);$uri = $parts[0];// 如果是能通过上述的正则分割出两段，那么，是通过query_string即？的形式进行路由访问if (isset($parts[1])){$_SERVER[QUERY_STRING] = $parts[1];// 函数把查询字符串解析到$_GET变量中。parse_str($_SERVER[QUERY_STRING], $_GET);}else{$_SERVER[QUERY_STRING] = \;$_GET = array();}// 如果为/，或者为空，有两种情况，要么就是通过query_string即？的形式进行路由访问，// 所以此时$parts[0]就是等于下面两种可能，同时我们// 已经通过$parts[1]拿到要拿的信息，则可以返回。// 要么就是以段的形式，但是段的信息为空，即直接访问入口文件而没有// 任何路由信息的传递，也可以直接返回。if ($uri == / || empty($uri)){return /;}//返回这个url的path部分。$uri = parse_url($uri, PHP_URL_PATH);// Do some final cleaning of the URI and return it// 将uri中的// ../替换成 / 返回return str_replace(array(//, ../), /, trim($uri, /));}// --------------------------------/** * Parse cli arguments * 解析cli参数 * Take each command line argument and assume it is a URI segment. * 如果你在命令行中这么操作 * php d:/wamp/www/CodeIgniter/index.php welcome index * _parse_cli_args() 返回一个 /welcome/index的字符串 * * @accessprivate * @returnstring */private function _parse_cli_args(){// 返回在命令行模式下运行时传递的参数。// 因为第一个参数是当前文件名，所以从第二个开始才是我们要获取的。$args = array_slice($_SERVER[argv], 1);//返回一个由/字符串拼接的字符串，因为$this->uri_string是一个字符串。return $args ? / . implode(/, $args) : \;}// --------------------------------/** * Filter segments 段 for malicious 恶意 characters * 过滤不合法字符 * @accessprivate * @paramstring * @returnstring */function _filter_uri($str){if ($str != \ && $this->config->item(permitted_uri_chars) != \ && $this->config->item(enable_query_strings) == FALSE){// preg_quote() in PHP 5.3 escapes -, so the str_replace() and addition of - to preg_quote() is to maintain 维持 backwards 向后// compatibility 兼容性 as many are unaware 不知道的 of how characters in the permitted_uri_chars will be parsed as a regex pattern// 大概意思是 由于php5.3.0 字符 - 被增加为需要转义的。 所以这里在使用str_replace()要添加preg_quote()来对-进行转义if ( ! preg_match("|^[".str_replace(array(\\-, \-), -, preg_quote($this->config->item(permitted_uri_chars), -))."]+$|i", $str)){show_error(The URI you submitted has disallowed characters., 400);}}// Convert programatic characters to entities// 转换字符实体$bad= array($,(,),\%28,\%29);$good= array($,(,),(,));return str_replace($bad, $good, $str);}// --------------------------------/** * Remove the suffix from the URL if needed * // 去掉url的我们自定义的后缀。 * @accessprivate * @returnvoid */function _remove_url_suffix(){if ($this->config->item(url_suffix) != ""){$this->uri_string = preg_replace("|".preg_quote($this->config->item(url_suffix))."$|", "", $this->uri_string);}}// --------------------------------/** * Explode the URI Segments. The individual segments will * be stored in the $this->segments array. * 将uri拆分正段同时对每个段进行过滤，并存入$this->segments[]中 * @accessprivate * @returnvoid */function _explode_segments(){foreach (explode("/", preg_replace("|/*(.+?)/*$|", "\\1", $this->uri_string)) as $val){// Filter segments for security$val = trim($this->_filter_uri($val));if ($val != \){$this->segments[] = $val;}}}// --------------------------------/** * Re-index Segments 重新索引段 * 使得出来的段以下标1开始保存。这样做可以更简单的使用使用因为段数组和真实的段有个1:1的关系 * This function re-indexes the $this->segment array so that it * starts at 1 rather than 0. Doing so makes it simpler to * use functions like $this->uri->segment(n) since there is * a 1:1 relationship 关系 between the segment array and the actual 真实的 segments. * * @accessprivate * @returnvoid */function _reindex_segments(){array_unshift($this->segments, NULL);array_unshift($this->rsegments, NULL);unset($this->segments[0]);unset($this->rsegments[0]);}// --------------------------------/** * Fetch a URI Segment * 获取一个uri段 * This function returns the URI segment based on the number provided.提供 * 这个函数返回一个基于提供的数字uri段 * @accesspublic * @paraminteger * @parambool * @returnstring */function segment($n, $no_result = FALSE){return ( ! isset($this->segments[$n])) ? $no_result : $this->segments[$n];}// --------------------------------/** * Fetch a URI "routed" Segment * 返回确定路由后的某一段 * This function returns the re-routed URI segment (assuming 假设 routing rules 规则 are used) * based on the number provided. If there is no routing this function returns the * same result as $this->segment() * 这个函数返回一个已经路由的基于提供的数字的uri段（假设路由规则已经使用的） * 如果还没与路由这个函数将和$this->segment()是一样的 * * @accesspublic * @paraminteger * @parambool * @returnstring */function rsegment($n, $no_result = FALSE){return ( ! isset($this->rsegments[$n])) ? $no_result : $this->rsegments[$n];}// --------------------------------/** * Generate 产生 a key value pair 一对 from the URI string * 根据uri字符串产生一个键值对的数组 * * This function generates and associative 关联的 array of URI data starting * at the supplied 由。。。提供 segment. For example, if this is your URI: * */user/search/name/joe/location/UK/gender/male * * You can use this function to generate an array with this prototype: * * array ( *name => joe *location => UK *gender => male * ) * 这个函数由uri段产生一个关联数组 * 例子：如果你的uri是这样的 * /user/search/name/joe/location/UK/gender/male * 那么将产生一个这样的原型 * array ( *name => joe *location => UK *gender => male * ) * @accesspublic * @paramintegerthe starting segment number * @paramarrayan array of default values * @returnarray */function uri_to_assoc($n = 3, $default = array()){return $this->_uri_to_assoc($n, $default, segment);}/** * Identical 完全相同的事物 to above only it uses the re-routed segment array * 跟上一个函数是完全相同的只是它冲洗路由了段数组 （注意看第三个参数） * @access public * @param integerthe starting segment number * @param arrayan array of default values * @return array * */function ruri_to_assoc($n = 3, $default = array()){return $this->_uri_to_assoc($n, $default, segment);}// --------------------------------/** * Generate a key value pair from the URI string or Re-routed URI string * 根据uri字符串或者重新路由的uri字符串产生一个键值对数组 * @accessprivate * @paramintegerthe starting segment number 起始段号 * @paramarrayan array of default values * @paramstringwhich array we should use * @returnarray */function _uri_to_assoc($n = 3, $default = array(), $which = segment){// 区分段数组是不是重新路由的。if ($which == segment){$total_segments = otal_segments;$segment_array = segment_array;}else{$total_segments = otal_rsegments;$segment_array = segment_array;}// $n 是不是一个数字if ( ! is_numeric($n)){return $default;}// 缓存uri段列表中是够存在$n这个keyif (isset($this->keyval[$n])){return $this->keyval[$n];}// 总段数小于$n if ($this->$total_segments() $segment_array(), ($n - 1));$i = 0;$lastval = \;$retval = array();foreach ($segments as $seg){if ($i % 2){$retval[$lastval] = $seg;}else{$retval[$seg] = FALSE;$lastval = $seg;}$i++;}if (count($default) > 0){foreach ($default as $val){if ( ! array_key_exists($val, $retval)){$retval[$val] = FALSE;}}}// Cache the array for reuse// 缓存数组一遍重用$this->keyval[$n] = $retval;return $retval;}// --------------------------------/** * Generate a URI string from an associative 关联数组 array * 根据一个关联数组产生一个uri字符串 * * @accesspublic * @paramarrayan associative array of key/values * @returnarray */function assoc_to_uri($array){$temp = array();foreach ((array)$array as $key => $val){$temp[] = $key;$temp[] = $val;}return implode(/, $temp);}// --------------------------------/** * Fetch a URI Segment and add a trailing 后面的，尾随 slash * 获取一个uri段并且添加一个/ * * @accesspublic * @paraminteger * @paramstring * @returnstring */function slash_segment($n, $where = railing){return $this->_slash_segment($n, $where, segment);}// --------------------------------/** * Fetch a URI Segment and add a trailing slash * 获取一个已经路由的uri段并且添加/ * @accesspublic * @paraminteger * @paramstring * @returnstring */function slash_rsegment($n, $where = railing){return $this->_slash_segment($n, $where, segment);}// --------------------------------/** * Fetch a URI Segment and add a trailing slash - helper function * * @accessprivate * @paraminteger * @paramstring * @paramstring * @returnstring */function _slash_segment($n, $where = railing, $which = segment){$leading= /;$trailing= /;if ($where == railing){$leading= \;}elseif ($where == leading){$trailing= \;}return $leading.$this->$which($n).$trailing;}// --------------------------------/** * Segment Array * 获取段数组 * @accesspublic * @returnarray */function segment_array(){return $this->segments;}// --------------------------------/** * Routed Segment Array * 获取已经路由的段数组 * @accesspublic * @returnarray */function rsegment_array(){return $this->rsegments;}// --------------------------------/** * Total number of segments * 获取段总数 * @accesspublic * @returninteger */function total_segments(){return count($this->segments);}// --------------------------------/** * Total number of routed segments * 获取已经路由的段的总数 * @accesspublic * @returninteger */function total_rsegments(){return count($this->rsegments);}// --------------------------------/** * Fetch the entire URI string * * @accesspublic * @returnstring */function uri_string(){return $this->uri_string;}// --------------------------------/** * Fetch the entire Re-routed URI string * * @accesspublic * @returnstring */function ruri_string(){return /.implode(/, $this->rsegment_array());}}// END URI Class/* End of file URI.php *//* Location: ./system/core/URI.php */

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