[PHP] _ZLIB_OC//If the output compression function is turned on in the configuration item, the value of $this->_zlib_oc is on $this->_zlib_oc = @ini_get (' zlib.output_compression '); Get MIME types for later//get mimetype if (defined (' Environment ') and file_exists (APPPATH. ' config/'). Environment. ' /mimes.php ') {include APPPATH. ' config/'. Environment. ' /mimes.php '; } else {include APPPATH. ' config/mimes.php ';}//$mimes is an array defined in mimes.php $this->mime_types = $mimes; Log_message (' Debug ', ' Output Class Initialized '); }//--------------------------------------------------------------------/** * Get output * Using this method, you can get the data that will be output, and save it. * Returns the current output String * Returns the string that is currently exported * @access public * @return String */function Get_output () {Retu RN $this->final_output; }//--------------------------------------------------------------------/** * Set Output * * Sets the output string * settings The output String * @access public * @param string * @return void */function Set_output ($output) {$this->final_output = $output; return $this; } // --------------------------------------------------------------------/** * Append Output * Append the data after the final input string * Appends the onto the output string * * @access Public * @param string * @return void */function Append_output ($output) {if ($this->final_output = =) {$this->final_output = $output;} else {$this->final_output. = $output;} return $this; }//--------------------------------------------------------------------/** * Set Header * Using this method, Allows you to set the header of the HTTP protocol that will be sent to the browser, which is equivalent to PHP's standard function: header (). * Lets You set a server header which is outputted with the final display. * Allows you to set a server header for the final display output. * Note:if A file is cached, headers won't is sent. We need to figure calculation out * How to permit header data to being saved with the cache data ... * * @access public * @param string * @param bool * @return void */function Set_header ($header, $replace = TRUE) {//If zlib.output_compression is enabled It'll compress the output,//But it won't modify the Content-length header to compensate compensation for//theReduction reduced restore, causing the browser to hang waiting for more data. We ' ll just skip content-length in those cases. if ($this->_zlib_oc && strncasecmp ($header, ' content-length ', + = = 0) {return;} $this->headers[] = array ($header, $replace); return $this; }//--------------------------------------------------------------------/** * Set Content Type Header * Set Content-type * @access Public * @param string extension of the file we ' re outputting * @return void */function Set_content_type ($mime _ Type) {if (Strpos ($mime _type, '/') = = = = FALSE) {$extension = LTrim ($mime _type, '. ');//Is this extension supported? if ( Isset ($this->mime_types[$extension]) {$mime _type =& $this->mime_types[$extension]; if (Is_array ($mime _ Type) {$mime _type = current ($mime _type);}} } $header = ' Content-type: '. $mime _type; $this->headers[] = Array ($header, TRUE); return $this; }//--------------------------------------------------------------------/** * Set HTTP Status HeadeR * moved to Common procedural functions in 1.7.2 * allows you to manually set the server Status header (header) * @access public * @param int the status code * @param string * @return void */function Set_status_header ($code = $, $text = ") {Set_status_header ($code, $text); ret Urn $this; }//--------------------------------------------------------------------/** * Enable/disable Profiler * allows you to turn on or disable the parser * @access public * @param bool * @return void */function Enable_profiler ($val = TRUE) {$this->enable_profiler = (is_boo L ($val))? $val: TRUE; return $this; }//--------------------------------------------------------------------/** * Set Profiler Sections * Set $this->_ Profiler_sections * Allows override of Default/config settings for Profiler section display * allows you to control (on/off) its specific part when the profiler is enabled * * @access Public * @param array * @return void */function set_profiler_sections ($sections) {foreach ($sections as $secti On = $enable) {$this->_profiler_sections[$section] = ($enable!== FALSE)? True:false; } return $this; }//--------------------------------------------------------------------/** * Set Cache * Sets Caching and cache time * @access public * @param integer where $time is the number of minutes you want the update to be cached * @return void */function cache ($time) {$this->cache_expiration = (! is_numer IC ($time))? 0: $time; return $this; }//--------------------------------------------------------------------/** * Display OUTPUT * Show outputs * All "view" data is Automatically put into this variable by the Controller class: * * $this->final_output * * This function sends the FINA lized output data to the browser along * with any server headers and profile data. It also stops the * benchmark timer so the page rendering speed and memory usage can be shown. * * @access Public * @param String * @return Mixed */function _display ($output = ") {//Note:we use globals because We Can ' t use $CI =& get_instance ()//Since this function was sometimes called by the caching mechanism,//which happens Before the CI Super object is available. //NOTE: We use global because we cannot use $ci =& get_instance () global $BM, $CFG; Grab the Super object if we can. Of course, if we can get the super controller, we'll get it first. if (class_exists (' Ci_controller ')) {$CI =& get_instance ();}//------------------------------------------------- -------------------//Set the output data//Set the outputs if ($output = = ") {$output =& $this->final_output;}//---- ----------------------------------------------------------------//Do we need to write a cache file? Only if the controller does not has its//own _output () method and we is not dealing with a cache file, which we//can Determine by the existence of the $CI object above//if the cache time >0, $CI the Super object exists and the Super object exists _output method//Call _write_cache method, write a A cache file if ($this->cache_expiration > 0 && isset ($CI) && method_exists ($CI, ' _output ')) {$this _write_cache ($output); }//--------------------------------------------------------------------//Parse out the elapsed time and memory usage, Then swap the pseudo-variables with the data//Calculate Code Execution time and memory usage time $elapsed = $BM->elapsed_time (' Total_execution_time_start ', ' total _execution_time_end '); If $this->parse_exec_vars is true, replace {elapsed_time},{memory_usage}///In the output with the calculated time. if ($this->parse_exec_vars = = = TRUE) {$memory = (! function_exists (' memory_get_usage '))? ' 0 ': Round (Memory_get_usage ()/1024/1024, 2). ' MB '; $output = Str_replace (' {elapsed_time} ', $elapsed, $output); $output = Str_replace (' {memory_usage} ', $memory, $output); }//--------------------------------------------------------------------//is compression requested? processing of compressed transmissions. if ($CFG->item (' compress_output ') = = = TRUE && $this->_zlib_oc = = FALSE) {if (extension_loaded (' zlib ')) {if (Isset ($_server[' http_accept_encoding ') and Strpos ($_server[' http_accept_encoding '], ' gzip ')!== FALSE) {Ob_start (' Ob_gzhandler ');} }}//--------------------------------------------------------------------//Is there any server headers to send? Do you have server hair delivery? if (couNT ($this->headers) > 0) {foreach ($this->headers as $header) {@header ($header [0], $header [1]);}}//--------- -----------------------------------------------------------//Does The $CI object exist? If not we know we is dealing with a cache file so we'll//simply echo out the data and exit. If there is no $ci to prove that the current is a cached output, we simply send the data and exit if (! Isset ($CI)) {echo $output; Log_message (' Debug ', "Final output sent to browse R "); Log_message (' Debug ', "Total execution Time:". $elapsed); return TRUE; }//--------------------------------------------------------------------//Do we need to generate profile data? If So, load the profile class and run it. If performance analysis is turned on we call,//will generate some reports to the end of the page to assist us in debugging. if ($this->enable_profiler = = TRUE) {$CI->load->library (' Profiler '); if (! Emptyempty ($this->_profiler_ Sections) {$CI->profiler->set_sections ($this->_profiler_sections);}/If The output data contains closingandtags//We'll remove them and add them back after we insert the profile data//if presentTag, we will delete, insert our profiling code and then add back if (Preg_match ("|.*?|is ", $output)) {$output = Preg_replace (" |.*?|is ",", $output); $output. = $CI->profiler->run (); $output. = ''; } else {$output. = $CI->profiler->run ();}} --------------------------------------------------------------------//Does the controller contain a function named _output ()? If so send the output there. Otherwise, echo it. If the controller has _output this method we call directly//If no data is sent directly to the browser if (method_exists ($CI, ' _output ')) {$CI->_output ($output);} else {Ech o $output; Send it to the browser! } log_message (' Debug ', "Final output sent to browser"); Log_message (' Debug ', "Total execution Time:". $elapsed);} --------------------------------------------------------------------/** * Write A cache file * Generates a cached files * @access Publ IC * @param string * @return void */function _write_cache ($output) {//Call Super Object $CI =& get_instance ();//Find cache path $path = $CI->config->item (' Cache_path '); $cache _path = ($path = = ")? APPPATH. ' cache/': $path; If the cache path is not a folder or is not writable, an error is returned. if (! Is_dir ($cache _path) OR! is_really_writable ($cache _path)) {log_message (' error ', "Unable to write cache file: ". $cache _path); Return }//Get $uri $uri = $CI->config->item (' Base_url '). $CI->config->item (' Index_page '). $CI->uri->uri_string (); Generate the cache file. $cache _path. = MD5 ($uri); if (! $fp = @fopen ($cache _path, fopen_write_create_destructive)) {log_message (' error ', "Unable to WRITE cache file:". $c Ache_path); Return }//calculates the cache file expiration time. $expire = time () + ($this->cache_expiration * 60); if (Flock ($FP, lock_ex)) {fwrite ($fp, $expire. ' TS---> '. $output); Flock ($fp, lock_un);} else {log_message (' error ', "U Nable to secure a file lock for file at: ". $cache _path); Return } fclose ($FP); @chmod ($cache _path, File_write_mode); Log_message (' Debug ', ' Cache file written: '. $cache _path);} --------------------------------------------------------------------/** * Update/serve a cached file * There is a call to this method in codeigniter.php, this method is responsible for the output of the cache, * If this method is called in codeigniter.php output, then * The operation of this request will end directly, with the cached output as the response. * * @access public * @param object Config class * @param object URI class * @return void */FunCtion _display_cache (& $CFG, & $URI) {//Get the path to save cache $cache _path = ($CFG->item (' cache_path ') = = ")? APPPATH. ' cache/': $CFG->item (' Cache_path '); Build the file path. The file name is a MD5 hash of the full URI//One exact route will correspond to a cache file, and the cache file is the MD5 cipher for the corresponding routing string. $uri = $CFG->item (' Base_url '). $CFG->item (' Index_page '). $URI->uri_string; $filepath = $cache _path.md5 ($uri); If you do not have this cache file, you can return FALSE if you fail to get cached content. if (! @file_exists ($filepath)) {return false;}//If you have this cache file but cannot read, get cached content fails, and also return false. if (! $fp = @fopen ($filepath, Fopen_read)) {return FALSE;}//opens to the cache file and takes $fp as a handle. The next step is to obtain a shared lock (read). Flock ($FP, lock_sh); $cache = "; if (filesize ($filepath) > 0) {$cache = Fread ($fp, FileSize ($filepath));}//Unlock flock ($fp, lock_un); Close the file connection. Fclose ($FP); The following TS--->, just because the content of the CI cache file//is stipulated in the digital +ts---> start. This number represents the creation time. If this structure is not met, it can be treated as a non-CI cache file, or the file is corrupted,//Get cached content failed and return false. Strip out the embedded timestamp if (! Preg_match ("/(\d+ts--->)/", $cache, $match)) {return FALSE; }//has the file expired? If so we ' ll delete it. Determine if the cache expires and if it expires we will remove it if (time () >= trim (str_replace (' TS---> ', ', $match [' 1 '])) {if (Is_really_writable ($cache _path) {@unlink ($filepath); Log_message (' Debug ', "Cache file has expired. File deleted "); return FALSE; }}//Display the cache $this->_display (str_replace ($match [' 0 '], ' ', $cache)); Log_message (' Debug ', "Cache file is current. Sending it to browser. "); return TRUE; }}//End Output Class/* End of File output.php */* location:./system/core/output.php */
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