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| <td><h1>Code Igniter User Guide Version 1.5.0b3</h1></td> | |
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| Output Class | |
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| <h1>Output Class</h1> | |
| <p>The Output class is a small class with one main function: To send the finalized web page to the requesting browser. It is | |
| also responsible for <a href="../general/caching.html">caching</a> your web pages, if you use that feature.</p> | |
| <p class="important"><strong>Note:</strong> This class is initialized automatically by the system so there is no need to do it manually.</p> | |
| <p>Under normal circumstances you won't even notice the Output class since it works transparently without your intervention. | |
| For example, when you use the <a href="../libraries/loader.html">Loader</a> class to load a view file, it's automatically | |
| passed to the Output class, which will be called automatically by Code Igniter at the end of system execution. | |
| It is possible, however, for you to manually intervene with the output if you need to, using either of the two following functions:</p> | |
| <h2>$this->output->set_output();</h2> | |
| <p>Permits you to manually set the final output string. Usage example:<p> | |
| <code>$this->output->set_output($data);</code> | |
| <p><strong>Important:</strong> If you do set your output manually, it must be the last thing done in the function you call it from. | |
| For example, if you build a page in one of your controller functions, don't set the output until the end.</p> | |
| <h2>$this->output->get_output();</h2> | |
| <p>Permits you to manually retrieve any output that has been sent for storage in the output class. Usage example:<p> | |
| <code>$string = $this->output->get_output();</code> | |
| <p>Note that data will only be retrievable from this function if it has been previously sent to the output class by one of the | |
| Code Igniter functions like <var>$this->load->view()</var>.</p> | |
| <h2>$this->output->set_header();</h2> | |
| <p>Permits you to manually set server headers, which the output class will send for you when outputting the final rendered display. Example:<p> | |
| <code> | |
| $this->output->set_header("HTTP/1.0 200 OK");<br /> | |
| $this->output->set_header("HTTP/1.1 200 OK");<br /> | |
| $this->output->set_header('Last-Modified: '.gmdate('D, d M Y H:i:s', $last_update).' GMT');<br /> | |
| $this->output->set_header("Cache-Control: no-store, no-cache, must-revalidate");<br /> | |
| $this->output->set_header("Cache-Control: post-check=0, pre-check=0", false);<br /> | |
| $this->output->set_header("Pragma: no-cache"); </code> | |
| <h2>$this->output->enable_profiler();</h2> | |
| <p>Permits you to enable/disable the <a href="../general/profiling.html">Profiler</a>, which will display benchmark and other data | |
| at the bottom of your pages for debugging and optimization purposes.</p> | |
| <p>To enable the profiler place the following function anywhere within your <a href="controllers.html">Controller</a> functions:</p> | |
| <code>$this->output->enable_profiler(TRUE);</code> | |
| <p>When enabled a report will be generated and inserted at the bottom of your pages.</p> | |
| <p>To disable the profiler you will use:</p> | |
| <code>$this->output->enable_profiler(FALSE);</code> | |
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