Added a Reserved Names page to the userguide, and migrated reserved controller names into it.
Added a Common Functions page to the userguide for globally available functions.
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+<title>Reserved Names : CodeIgniter User Guide</title>
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+<td><h1>CodeIgniter User Guide Version 1.6.2</h1></td>
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+Controllers
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+
+<h1>Reserved Names</h1>
+
+<p>In order to help out, CodeIgniter uses a series of functions and names in its operation. Because of this, some names cannot be used by a developer. Following is a list of reserved names that cannot be used.</p>
+<h3>Controller names</h3>
+<p>Since your controller classes will extend the main application controller you
+must be careful not to name your functions identically to the ones used by that class, otherwise your local functions
+will override them. The following
+is a list of reserved names. Do not name your controller functions any of these:</p>
+<ul>
+ <li>Controller</li>
+ <li>CI_Base</li>
+ <li>_ci_initialize</li>
+ <li>_ci_scaffolding</li>
+</ul>
+<p><br />
+ If you are running PHP 4 there are some additional reserved names. These ONLY apply if you are running PHP 4.</p>
+<ul>
+ <li>CI_Loader</li>
+ <li>config</li>
+ <li>database</li>
+ <li>dbutil</li>
+ <li>dbforge</li>
+ <li>file</li>
+ <li>helper</li>
+ <li>helpers</li>
+ <li>language</li>
+ <li>library</li>
+ <li>model</li>
+ <li>plugin</li>
+ <li>plugins</li>
+ <li>scaffolding</li>
+ <li>script</li>
+ <li>view</li>
+ <li>vars</li>
+ <li>_ci_assign_to_models</li>
+ <li>_ci_autoloader</li>
+ <li>_ci_init_class</li>
+ <li>_ci_init_scaffolding</li>
+ <li>_ci_is_instance</li>
+ <li>_ci_load</li>
+ <li>_ci_load_class</li>
+ <li>_ci_object_to_array</li>
+</ul>
+<h3>Functions</h3>
+<ul>
+ <li>is_really_writable</li>
+ <li>config_item</li>
+ <li>show_error</li>
+ <li>show_404</li>
+ <li>log_message</li>
+ <li>_exception_handler</li>
+ </ul>
+<h3>Variables</h3>
+<ul>
+ <li>config</li>
+ <li>mimes</li>
+ </ul>
+<h3>Constants</h3>
+<ul>
+ <li>CI_VERSION</li>
+ <li>EXT</li>
+ <li>FCPATH</li>
+ <li>SELF</li>
+ <li>BASEPATH</li>
+ <li>APPPATH</li>
+ <li>FILE_READ_MODE</li>
+ <li>FILE_WRITE_MODE</li>
+ <li>DIR_READ_MODE</li>
+ <li>DIR_WRITE_MODE</li>
+ <li>FOPEN_READ</li>
+ <li>FOPEN_READ_WRITE</li>
+ <li>FOPEN_WRITE_CREATE_DESTRUCTIVE</li>
+ <li>FOPEN_READ_WRITE_CREATE_DESTRUCTIVE</li>
+ <li>FOPEN_WRITE_CREATE</li>
+ <li>FOPEN_READ_WRITE_CREATE</li>
+ <li>FOPEN_WRITE_CREATE_STRICT</li>
+ <li>FOPEN_READ_WRITE_CREATE_STRICT</li>
+</ul>
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