Application 效能分析
這個效能分析類別(Profiler Class)會顯示出 benchmark 的查詢結果、然後將 $_POST 的資料置於頁面的尾端。這些資訊在進行開發時，用來協助除錯或是最佳化相當有用。
類別初始化
非常重要: 這各類別 不需要 額外步驟將它初始化。他可由 Output 類別 自動載入，效能分析功能就會啟動並顯示結果在頁面尾端。
啟動效能分析器
可在 控制器(Controller) 函數中，啟動效能分析器:
$this->output->enable_profiler(TRUE);
當啟動之後，效能結果就會被產生出來，然後塞進也面尾端。
關閉效能分系器的方式:
$this->output->enable_profiler(FALSE);
設定 Benchmark 點
In order for the Profiler to compile and display your benchmark data you must name your mark points using specific syntax.
Please read the information on setting Benchmark points in Benchmark Class page.
Enabling and Disabling Profiler Sections
Each section of Profiler data can be enabled or disabled by setting a corresponding config variable to TRUE or FALSE. This can be done one of two ways. First, you can set application wide defaults with the application/config/profiler.php config file.
$config['config'] = FALSE;
$config['queries'] = FALSE;
In your controllers, you can override the defaults and config file values by calling the set_profiler_sections() method of the Output class:
$sections = array(
'config' => TRUE,
'queries' => TRUE
);
$this->output->set_profiler_sections($sections);
Available sections and the array key used to access them are described in the table below.
| Key | Description | Default |
|---|---|---|
| benchmarks | Elapsed time of Benchmark points and total execution time | TRUE |
| config | CodeIgniter Config variables | TRUE |
| controller_info | The Controller class and method requested | TRUE |
| get | Any GET data passed in the request | TRUE |
| http_headers | The HTTP headers for the current request | TRUE |
| memory_usage | Amount of memory consumed by the current request, in bytes | TRUE |
| post | Any POST data passed in the request | TRUE |
| queries | Listing of all database queries executed, including execution time | TRUE |
| uri_string | The URI of the current request | TRUE |
| query_toggle_count | The number of queries after which the query block will default to hidden. | 25 |