CodeIgniter Home
- What is CodeIgniter?
- Features of CodeIgniter
- Advantages over other PHP frameworks
- CodeIgniter version history
CodeIgniter Overview
- Key Components of CodeIgniter
- MVC design pattern explained
- Workflow of a CodeIgniter application
- System and Application folders overview
CodeIgniter Installing CodeIgniter
- System Requirements (PHP, MySQL, Extensions)
- Downloading & Extracting CodeIgniter
- Folder structure explained
- Setting base URL
- Configuring index.php file
- Running first application
CodeIgniter Application Architecture
- Folder structure in detail
- Application vs System folders
- Config, Controllers, Models, Views
- Helpers and Libraries placement
- User Guide access
CodeIgniter MVC Framework
- Understanding MVC flow
- Codeigniter Creating Controllers
- Creating Views
- Creating Models
- Loading Models and Views
- Data flow between MVC components
CodeIgniter Basic Concepts
- URLs in CodeIgniter
- Default controller setup
- Routing basics
- Auto-loading resources
- Naming conventions
CodeIgniter Configuration
- Configuration files overview
- Base URL and Index page settings
- Encryption key setup
- Codeigniter Database configuration
- Error logging configuration
- Custom configuration files
CodeIgniter Working with Database
- Database configuration
- Loading database library
- Query Builder class
- Running queries (select, insert, update, delete)
- Active Record class
- Transactions
- Joins, Grouping, Ordering, Limit
- Query bindings
- Result handling (row(), result())
CodeIgniter Libraries
- Built-in libraries overview
- Loading libraries
- Common libraries: Pagination, Upload, Email, Form Validation, Session, Encryption, Calendar
- Creating custom libraries
CodeIgniter Error Handling
- Error reporting levels
- Custom error pages (404, 500)
- Using log_message()
- Displaying errors in development vs production
CodeIgniter File Uploading
- Upload library setup
- File upload configuration (path, allowed types, max size)
- Handling errors in upload
- Multiple file uploads
- Securing uploads
CodeIgniter Sending Email
- Email library configuration
- Sending emails via SMTP
- Sending attachments
- Sending HTML emails
- Debugging email errors
CodeIgniter Form Validation
- Form validation library overview
- Setting validation rules
- Prepping data before validation
- Error messages customization
- Validation callbacks
- Server-side vs Client-side validation
CodeIgniter Session Management
- Session library configuration
- Storing session data
- Retrieving session data
- Flashdata in sessions
- Database-driven sessions
CodeIgniter Flashdata
- What is Flashdata?
- Creating flashdata messages
- Retrieving flashdata
- Flashdata expiration
CodeIgniter Tempdata
- Difference between flashdata & tempdata
- Creating tempdata
- Retrieving tempdata
- Removing tempdata
CodeIgniter Cookie Management
- Setting cookies
- Retrieving cookies
- Deleting cookies
- Cookie security
CodeIgniter Common Functions
- base_url()
- site_url()
- redirect()
- form_open() & form helper functions
- String helper functions
CodeIgniter Page Caching
- Enabling page caching
- Cache expiration
- Deleting cache files
- Best practices in caching
CodeIgniter Page Redirection
- Redirect helper function
- Permanent vs Temporary redirection
- Redirect with flashdata
CodeIgniter Application Profiling
- Enabling profiler
- Profiler sections (benchmarks, queries, post data, etc.)
- Customizing profiler output
CodeIgniter Benchmarking
- Benchmark class usage
- Measuring script execution time
- Measuring memory usage
- Custom benchmarks
CodeIgniter Adding JS and CSS
- Loading assets in views
- Using base_url() for assets
- Best practices for assets organization
- Versioning assets
CodeIgniter Internationalization
- Language files in CodeIgniter
- Loading language files
- Switching languages dynamically
- Multi-language website structure
CodeIgniter Security
- Input filtering and XSS cleaning
- CSRF protection
- SQL Injection prevention
- Password hashing & encryption
- Secure file uploads
- Using HTTPS with CodeIgniter

User Guide access

Last modified on: September 7, 2025

<h1 data-start="511" data-end="547">📝 CodeIgniter User Guide Access</h1>
<h2 data-start="549" data-end="569">🔎 Introduction</h2>
<p data-start="570" data-end="674">The <strong data-start="574" data-end="600">CodeIgniter User Guide</strong> is the official documentation that provides detailed information about:</p>
<ul data-start="675" data-end="803">
<li data-start="675" data-end="691">
<p data-start="677" data-end="691">Installation</p>
</li>
<li data-start="692" data-end="709">
<p data-start="694" data-end="709">Configuration</p>
</li>
<li data-start="710" data-end="750">
<p data-start="712" data-end="750">Core classes, helpers, and libraries</p>
</li>
<li data-start="751" data-end="771">
<p data-start="753" data-end="771">MVC architecture</p>
</li>
<li data-start="772" data-end="803">
<p data-start="774" data-end="803">Best practices and examples</p>
</li>
</ul>
<p data-start="805" data-end="879">It&rsquo;s the <strong data-start="814" data-end="870">best reference for beginners and advanced developers</strong> alike.</p>
<hr data-start="881" data-end="884" />
<h2 data-start="886" data-end="928">🌐 1. Accessing the Online User Guide</h2>
<h3 data-start="930" data-end="970">Step 1: Visit the Official Website</h3>
<ul data-start="971" data-end="1014">
<li data-start="971" data-end="1014">
<p data-start="973" data-end="1014">Go to the official CodeIgniter website:</p>
</li>
</ul>
<div class="contain-inline-size rounded-2xl relative bg-token-sidebar-surface-primary">
<div class="sticky top-9">
<div class="absolute end-0 bottom-0 flex h-9 items-center pe-2">
<div class="bg-token-bg-elevated-secondary text-token-text-secondary flex items-center gap-4 rounded-sm px-2 font-sans text-xs">&nbsp;</div>
</div>
</div>
<div class="overflow-y-auto p-4" dir="ltr"><code class="whitespace-pre!">https:<span class="hljs-comment">//codeigniter.com/user_guide</span>
</code></div>
</div>
<h3 data-start="1059" data-end="1092">Step 2: Select Your Version</h3>
<ul data-start="1093" data-end="1280">
<li data-start="1093" data-end="1186">
<p data-start="1095" data-end="1186">CodeIgniter 3: <a class="decorated-link cursor-pointer" target="_new" rel="noopener" data-start="1110" data-end="1184">https://codeigniter.com/userguide3/</a></p>
</li>
<li data-start="1187" data-end="1280">
<p data-start="1189" data-end="1280">CodeIgniter 4: <a class="decorated-link cursor-pointer" target="_new" rel="noopener" data-start="1204" data-end="1278">https://codeigniter.com/user_guide/</a></p>
</li>
</ul>
<h3 data-start="1282" data-end="1311">Step 3: Browse Sections</h3>
<p data-start="1312" data-end="1367">The online guide is structured into sections such as:</p>
<ul data-start="1368" data-end="1616">
<li data-start="1368" data-end="1399">
<p data-start="1370" data-end="1399">Introduction &amp; Installation</p>
</li>
<li data-start="1400" data-end="1430">
<p data-start="1402" data-end="1430">Tutorials &amp; Basic Concepts</p>
</li>
<li data-start="1431" data-end="1461">
<p data-start="1433" data-end="1461">Controllers, Models, Views</p>
</li>
<li data-start="1462" data-end="1485">
<p data-start="1464" data-end="1485">Helpers &amp; Libraries</p>
</li>
<li data-start="1486" data-end="1509">
<p data-start="1488" data-end="1509">Security &amp; Sessions</p>
</li>
<li data-start="1510" data-end="1538">
<p data-start="1512" data-end="1538">Database &amp; Query Builder</p>
</li>
<li data-start="1539" data-end="1557">
<p data-start="1541" data-end="1557">Error Handling</p>
</li>
<li data-start="1558" data-end="1584">
<p data-start="1560" data-end="1584">File Uploading &amp; Email</p>
</li>
<li data-start="1585" data-end="1616">
<p data-start="1587" data-end="1616">Deployment &amp; Best Practices</p>
</li>
</ul>
<h3 data-start="1618" data-end="1658">Step 4: Search for Specific Topics</h3>
<ul data-start="1659" data-end="1765">
<li data-start="1659" data-end="1765">
<p data-start="1661" data-end="1765">Use the search bar at the top to quickly find topics like <code data-start="1719" data-end="1728">session</code>, <code data-start="1730" data-end="1747">form validation</code>, or <code data-start="1752" data-end="1762">REST API</code>.</p>
</li>
</ul>
<hr data-start="1767" data-end="1770" />
<h2 data-start="1772" data-end="1815">📂 2. Accessing the Offline User Guide</h2>
<h3 data-start="1817" data-end="1857">Step 1: Download the Documentation</h3>
<ul data-start="1858" data-end="2094">
<li data-start="1858" data-end="1940">
<p data-start="1860" data-end="1940">CodeIgniter provides an <strong data-start="1884" data-end="1900">HTML version</strong> of the documentation for offline use.</p>
</li>
<li data-start="1941" data-end="2020">
<p data-start="1943" data-end="2020">Visit: <a class="decorated-link cursor-pointer" target="_new" rel="noopener" data-start="1950" data-end="2018">https://codeigniter.com/download</a></p>
</li>
<li data-start="2021" data-end="2094">
<p data-start="2023" data-end="2094">Download the <code data-start="2036" data-end="2042">.zip</code> package containing the <strong data-start="2066" data-end="2091">User Guide HTML files</strong>.</p>
</li>
</ul>
<h3 data-start="2096" data-end="2126">Step 2: Extract and Open</h3>
<ul data-start="2127" data-end="2248">
<li data-start="2127" data-end="2176">
<p data-start="2129" data-end="2176">Extract the folder anywhere on your computer.</p>
</li>
<li data-start="2177" data-end="2248">
<p data-start="2179" data-end="2248">Open <code data-start="2184" data-end="2196">index.html</code> in your browser to access the full guide offline.</p>
</li>
</ul>
<h3 data-start="2250" data-end="2283">Benefits of Offline Access:</h3>
<ul data-start="2284" data-end="2413">
<li data-start="2284" data-end="2308">
<p data-start="2286" data-end="2308">No internet required</p>
</li>
<li data-start="2309" data-end="2355">
<p data-start="2311" data-end="2355">Quick access to all examples and functions</p>
</li>
<li data-start="2356" data-end="2413">
<p data-start="2358" data-end="2413">Useful for workshops, local development, or tutorials</p>
</li>
</ul>
<hr data-start="2415" data-end="2418" />
<h2 data-start="2420" data-end="2460">🔄 3. Tips for Using the User Guide</h2>
<ol data-start="2462" data-end="3011">
<li data-start="2462" data-end="2578">
<p data-start="2465" data-end="2578"><strong data-start="2465" data-end="2497">Use Version-Specific Guides:</strong><br data-start="2497" data-end="2500" />Always refer to the guide that matches your CodeIgniter version (3 or 4).</p>
</li>
<li data-start="2580" data-end="2667">
<p data-start="2583" data-end="2667"><strong data-start="2583" data-end="2604">Explore Examples:</strong><br data-start="2604" data-end="2607" />Every helper, library, and class has <strong data-start="2647" data-end="2664">code examples</strong>.</p>
</li>
<li data-start="2669" data-end="2779">
<p data-start="2672" data-end="2779"><strong data-start="2672" data-end="2697">Check Configurations:</strong><br data-start="2697" data-end="2700" />Learn how to set up <code data-start="2723" data-end="2732">baseURL</code>, database, routes, and environment settings.</p>
</li>
<li data-start="2781" data-end="2886">
<p data-start="2784" data-end="2886"><strong data-start="2784" data-end="2814">Refer to Security Section:</strong><br data-start="2814" data-end="2817" />Understand input filtering, XSS prevention, and CSRF protection.</p>
</li>
<li data-start="2888" data-end="3011">
<p data-start="2891" data-end="3011"><strong data-start="2891" data-end="2926">Bookmark Frequently Used Pages:</strong><br data-start="2926" data-end="2929" />Common references: <code data-start="2951" data-end="2963">URL Helper</code>, <code data-start="2965" data-end="2982">Form Validation</code>, <code data-start="2984" data-end="3008">Database Query Builder</code>.</p>
</li>
</ol>
<hr data-start="3013" data-end="3016" />
<h2 data-start="3018" data-end="3038">✅ 4. Conclusion</h2>
<ul data-start="3040" data-end="3335">
<li data-start="3040" data-end="3140">
<p data-start="3042" data-end="3140">The <strong data-start="3046" data-end="3072">CodeIgniter User Guide</strong> is your go-to reference for learning and developing applications.</p>
</li>
<li data-start="3141" data-end="3219">
<p data-start="3143" data-end="3219">You can access it <strong data-start="3161" data-end="3171">online</strong> or <strong data-start="3175" data-end="3186">offline</strong> depending on your convenience.</p>
</li>
<li data-start="3220" data-end="3335">
<p data-start="3222" data-end="3335">Regularly using the User Guide helps you <strong data-start="3263" data-end="3320">master MVC, helpers, libraries, and advanced features</strong> efficiently.</p>
</li>
</ul>

Web Technology View More