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href="../general/autoloader.html">Auto-loading Resources</a></li> <li class="toctree-l2"><a class="reference internal" href="../general/common_functions.html">Common Functions</a></li> <li class="toctree-l2"><a class="reference internal" href="../general/compatibility_functions.html">Compatibility Functions</a></li> <li class="toctree-l2"><a class="reference internal" href="../general/routing.html">URI Routing</a></li> <li class="toctree-l2"><a class="reference internal" href="../general/errors.html">Error Handling</a></li> <li class="toctree-l2"><a class="reference internal" href="../general/caching.html">Caching</a></li> <li class="toctree-l2"><a class="reference internal" href="../general/profiling.html">Profiling Your Application</a></li> <li class="toctree-l2"><a class="reference internal" href="../general/cli.html">Running via the CLI</a></li> <li class="toctree-l2"><a class="reference internal" href="../general/managing_apps.html">Managing your Applications</a></li> <li class="toctree-l2"><a class="reference internal" href="../general/environments.html">Handling Multiple Environments</a></li> <li class="toctree-l2"><a class="reference internal" href="../general/alternative_php.html">Alternate PHP Syntax for View Files</a></li> <li class="toctree-l2"><a class="reference internal" href="../general/security.html">Security</a></li> <li class="toctree-l2"><a class="reference internal" href="../general/styleguide.html">PHP Style Guide</a></li> </ul> </li> </ul> <ul> <li class="toctree-l1"><a class="reference internal" href="../libraries/index.html">Libraries</a><ul> <li class="toctree-l2"><a class="reference internal" href="../libraries/benchmark.html">Benchmarking Class</a></li> <li class="toctree-l2"><a class="reference internal" href="../libraries/caching.html">Caching Driver</a></li> <li class="toctree-l2"><a class="reference internal" href="../libraries/calendar.html">Calendaring Class</a></li> <li class="toctree-l2"><a class="reference internal" href="../libraries/cart.html">Shopping Cart Class</a></li> <li class="toctree-l2"><a class="reference internal" href="../libraries/config.html">Config Class</a></li> <li class="toctree-l2"><a class="reference internal" href="../libraries/email.html">Email Class</a></li> <li class="toctree-l2"><a class="reference internal" href="../libraries/encrypt.html">Encrypt Class</a></li> <li class="toctree-l2"><a class="reference internal" href="../libraries/encryption.html">Encryption Library</a></li> <li class="toctree-l2"><a class="reference internal" href="../libraries/file_uploading.html">File Uploading Class</a></li> <li class="toctree-l2"><a class="reference internal" href="../libraries/form_validation.html">Form Validation</a></li> <li class="toctree-l2"><a class="reference internal" href="../libraries/ftp.html">FTP Class</a></li> <li class="toctree-l2"><a class="reference internal" href="../libraries/image_lib.html">Image Manipulation Class</a></li> <li class="toctree-l2"><a class="reference internal" href="../libraries/input.html">Input Class</a></li> <li class="toctree-l2"><a class="reference internal" href="../libraries/javascript.html">Javascript Class</a></li> <li class="toctree-l2"><a class="reference internal" href="../libraries/language.html">Language Class</a></li> <li class="toctree-l2"><a class="reference internal" href="../libraries/loader.html">Loader Class</a></li> <li class="toctree-l2"><a class="reference internal" href="../libraries/migration.html">Migrations Class</a></li> <li class="toctree-l2"><a class="reference internal" href="../libraries/output.html">Output Class</a></li> <li class="toctree-l2"><a class="reference internal" href="../libraries/pagination.html">Pagination Class</a></li> <li class="toctree-l2"><a class="reference internal" href="../libraries/parser.html">Template Parser Class</a></li> <li class="toctree-l2"><a class="reference internal" href="../libraries/security.html">Security Class</a></li> <li class="toctree-l2"><a class="reference internal" href="../libraries/sessions.html">Session Library</a></li> <li class="toctree-l2"><a class="reference internal" href="../libraries/table.html">HTML Table Class</a></li> <li class="toctree-l2"><a class="reference internal" href="../libraries/trackback.html">Trackback Class</a></li> <li class="toctree-l2"><a class="reference internal" href="../libraries/typography.html">Typography Class</a></li> <li class="toctree-l2"><a class="reference internal" href="../libraries/unit_testing.html">Unit Testing Class</a></li> <li class="toctree-l2"><a class="reference internal" href="../libraries/uri.html">URI Class</a></li> <li class="toctree-l2"><a class="reference internal" href="../libraries/user_agent.html">User Agent Class</a></li> <li class="toctree-l2"><a class="reference internal" href="../libraries/xmlrpc.html">XML-RPC and XML-RPC Server Classes</a></li> <li class="toctree-l2"><a class="reference internal" href="../libraries/zip.html">Zip Encoding Class</a></li> </ul> </li> </ul> <ul> <li class="toctree-l1"><a class="reference internal" href="../database/index.html">Database Reference</a><ul> <li class="toctree-l2"><a class="reference internal" href="../database/examples.html">Quick Start: Usage Examples</a></li> <li class="toctree-l2"><a class="reference internal" href="../database/configuration.html">Database Configuration</a></li> <li class="toctree-l2"><a class="reference internal" href="../database/connecting.html">Connecting to a Database</a></li> <li class="toctree-l2"><a class="reference internal" href="../database/queries.html">Running Queries</a></li> <li class="toctree-l2"><a class="reference internal" href="../database/results.html">Generating Query Results</a></li> <li class="toctree-l2"><a class="reference internal" href="../database/helpers.html">Query Helper Functions</a></li> <li class="toctree-l2"><a class="reference internal" href="../database/query_builder.html">Query Builder Class</a></li> <li class="toctree-l2"><a class="reference internal" href="../database/transactions.html">Transactions</a></li> <li class="toctree-l2"><a class="reference internal" href="../database/metadata.html">Getting MetaData</a></li> <li class="toctree-l2"><a class="reference internal" href="../database/call_function.html">Custom Function Calls</a></li> <li class="toctree-l2"><a class="reference internal" href="../database/caching.html">Query Caching</a></li> <li class="toctree-l2"><a class="reference internal" href="../database/forge.html">Database Manipulation with Database Forge</a></li> <li class="toctree-l2"><a class="reference internal" href="../database/utilities.html">Database Utilities Class</a></li> <li class="toctree-l2"><a class="reference internal" href="../database/db_driver_reference.html">Database Driver Reference</a></li> </ul> </li> </ul> <ul> <li class="toctree-l1"><a class="reference internal" href="../helpers/index.html">Helpers</a><ul> <li class="toctree-l2"><a class="reference internal" href="../helpers/array_helper.html">Array Helper</a></li> <li class="toctree-l2"><a class="reference internal" href="../helpers/captcha_helper.html">CAPTCHA Helper</a></li> <li class="toctree-l2"><a class="reference internal" href="../helpers/cookie_helper.html">Cookie Helper</a></li> <li class="toctree-l2"><a class="reference internal" href="../helpers/date_helper.html">Date Helper</a></li> <li class="toctree-l2"><a class="reference internal" href="../helpers/directory_helper.html">Directory Helper</a></li> <li class="toctree-l2"><a class="reference internal" href="../helpers/download_helper.html">Download Helper</a></li> <li class="toctree-l2"><a class="reference internal" href="../helpers/email_helper.html">Email Helper</a></li> <li class="toctree-l2"><a class="reference internal" href="../helpers/file_helper.html">File Helper</a></li> <li class="toctree-l2"><a class="reference internal" href="../helpers/form_helper.html">Form Helper</a></li> <li class="toctree-l2"><a class="reference internal" href="../helpers/html_helper.html">HTML Helper</a></li> <li class="toctree-l2"><a class="reference internal" href="../helpers/inflector_helper.html">Inflector Helper</a></li> <li class="toctree-l2"><a class="reference internal" href="../helpers/language_helper.html">Language Helper</a></li> <li class="toctree-l2"><a class="reference internal" href="../helpers/number_helper.html">Number Helper</a></li> <li class="toctree-l2"><a class="reference internal" href="../helpers/path_helper.html">Path Helper</a></li> <li class="toctree-l2"><a class="reference internal" href="../helpers/security_helper.html">Security Helper</a></li> <li class="toctree-l2"><a class="reference internal" href="../helpers/smiley_helper.html">Smiley Helper</a></li> <li class="toctree-l2"><a class="reference internal" href="../helpers/string_helper.html">String Helper</a></li> <li class="toctree-l2"><a class="reference internal" href="../helpers/text_helper.html">Text Helper</a></li> <li class="toctree-l2"><a class="reference internal" href="../helpers/typography_helper.html">Typography Helper</a></li> <li class="toctree-l2"><a class="reference internal" href="../helpers/url_helper.html">URL Helper</a></li> <li class="toctree-l2"><a class="reference internal" href="../helpers/xml_helper.html">XML Helper</a></li> </ul> </li> </ul> </div> </nav> <section data-toggle="wy-nav-shift" class="wy-nav-content-wrap"> <nav class="wy-nav-top" role="navigation" aria-label="top navigation"> <i data-toggle="wy-nav-top" class="fa fa-bars"></i> <a href="../index.html">CodeIgniter</a> </nav> <div class="wy-nav-content"> <div class="rst-content"> <div role="navigation" aria-label="breadcrumbs navigation"> <ul class="wy-breadcrumbs"> <li><a href="../index.html">Docs</a> »</li> <li><a href="index.html">CodeIgniter Overview</a> »</li> <li>Design and Architectural Goals</li> <li class="wy-breadcrumbs-aside"> </li> <div style="float:right;margin-left:5px;" id="closeMe"> <img title="Classic Layout" alt="classic layout" src="data:image/gif;base64,R0lGODlhFAAUAJEAAAAAADMzM////wAAACH5BAUUAAIALAAAAAAUABQAAAImlI+py+0PU5gRBRDM3DxbWoXis42X13USOLauUIqnlsaH/eY6UwAAOw==" /> </div> </ul> <hr/> </div> <div role="main" class="document"> <div class="section" id="design-and-architectural-goals"> <h1>Design and Architectural Goals<a class="headerlink" href="#design-and-architectural-goals" title="Permalink to this headline">¶</a></h1> <p>Our goal for CodeIgniter is maximum performance, capability, and flexibility in the smallest, lightest possible package.</p> <p>To meet this goal we are committed to benchmarking, re-factoring, and simplifying at every step of the development process, rejecting anything that doesn’t further the stated objective.</p> <p>From a technical and architectural standpoint, CodeIgniter was created with the following objectives:</p> <ul class="simple"> <li><strong>Dynamic Instantiation.</strong> In CodeIgniter, components are loaded and routines executed only when requested, rather than globally. No assumptions are made by the system regarding what may be needed beyond the minimal core resources, so the system is very light-weight by default. The events, as triggered by the HTTP request, and the controllers and views you design will determine what is invoked.</li> <li><strong>Loose Coupling.</strong> Coupling is the degree to which components of a system rely on each other. The less components depend on each other the more reusable and flexible the system becomes. Our goal was a very loosely coupled system.</li> <li><strong>Component Singularity.</strong> Singularity is the degree to which components have a narrowly focused purpose. In CodeIgniter, each class and its functions are highly autonomous in order to allow maximum usefulness.</li> </ul> <p>CodeIgniter is a dynamically instantiated, loosely coupled system with high component singularity. It strives for simplicity, flexibility, and high performance in a small footprint package.</p> </div> </div> <footer> <div class="rst-footer-buttons" role="navigation" aria-label="footer navigation"> <a href="../tutorial/index.html" class="btn btn-neutral float-right" title="Tutorial">Next <span class="fa fa-arrow-circle-right"></span></a> <a href="mvc.html" class="btn btn-neutral" title="Model-View-Controller"><span class="fa fa-arrow-circle-left"></span> Previous</a> </div> <hr/> <div role="contentinfo"> <p> © Copyright 2014 - 2019, British Columbia Institute of Technology. Last updated on Sep 19, 2019. </p> </div> Built with <a href="http://sphinx-doc.org/">Sphinx</a> using a <a href="https://github.com/snide/sphinx_rtd_theme">theme</a> provided by <a href="https://readthedocs.org">Read the Docs</a>. </footer> </div> </div> </section> </div> <script type="text/javascript"> var DOCUMENTATION_OPTIONS = { URL_ROOT:'../', VERSION:'3.1.11', COLLAPSE_INDEX:false, FILE_SUFFIX:'.html', HAS_SOURCE: false }; </script> <script type="text/javascript" src="../_static/jquery.js"></script> <script type="text/javascript" src="../_static/underscore.js"></script> <script type="text/javascript" src="../_static/doctools.js"></script> <script type="text/javascript" src="../_static/js/theme.js"></script> <script type="text/javascript"> jQuery(function () { SphinxRtdTheme.StickyNav.enable(); }); </script> </body> </html> Save