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  <div class="section" id="version-4-0-0-rc-4">
<h1>Version 4.0.0-rc.4<a class="headerlink" href="#version-4-0-0-rc-4" title="Permalink to this headline">¶</a></h1>
<p>Release Date: February 6, 2020</p>
<p><strong>RC.4 release of CodeIgniter4</strong></p>
<p>Enhancements:</p>
<ul class="simple">
<li>Fixed url systems so that it would work when system is served out of subfolders.</li>
<li>Added required insert ignore support for sqlite3 and mysql.</li>
<li>Add validation function <cite>is_not_unique</cite></li>
<li>Various improvements and cleanup to the Email class</li>
</ul>
<div class="section" id="prs-merged">
<h2>PRs merged:<a class="headerlink" href="#prs-merged" title="Permalink to this headline">¶</a></h2>
<ul class="simple">
<li>#2527 Update manual.rst</li>
<li>#2454 Page in the official documentation on ajax requests with iSAJAX() fixes</li>
<li>#2525 Remove incorrect inline doc type</li>
<li>#2524 Restore namespace after regress.</li>
<li>#2523 Replace legacy CI3 constant.</li>
<li>#2522 Adding Events information in the ‘Upgrading from 3.x to 4.x’ section</li>
<li>#2518 Fix pager URI to work in subfolders.</li>
<li>#2516 HTML Helper - Fix attribute type for lists</li>
<li>#2515 Layout Renderer Fix</li>
<li>#2513 Typo in userguide “Entity Classes - Business Logic”</li>
<li>#2511 Database add highlight</li>
<li>#2509 Revert Renderer section reset</li>
<li>#2507 Update ordering of search locations for better prioritization.</li>
<li>#2506 HTTP Response - Fix crash on CSP methods CSP is disabled</li>
<li>#2504 BaseConnection - Nullable return type in getConnectStart()</li>
<li>#2502 View Renderer - Reset sections after generating the ouput</li>
<li>#2501 view_cell call controller on initController method.</li>
<li>#2499 View Parser - Fix ParsePair() with filter</li>
<li>#2497 Fix splitQueryPart()</li>
<li>#2496 Use site_url for RedirectResponse.</li>
<li>#2495 update toolbar userguide</li>
<li>#2494 Debug Toolbar - Fix Debugbar-Time header, Render in &lt;head&gt;</li>
<li>#2493 fix sphinx version.</li>
<li>#2490 fix. Toolbar init view Error</li>
<li>#2489 Fix pager</li>
<li>#2486 Update current_url and previous_url in the docs for View Parser.</li>
<li>#2485 Typo in user guide “Running via the Command Line”</li>
<li>#2482 Services request add URI Core System extend support</li>
<li>#2481 Priority Redirection.</li>
<li>#2472 ControllerTest should work without URI specified. Fixes #2470</li>
<li>#2471 Transition from Zend Escaper to Laminas Escaper</li>
<li>#2462 Fix impossible length for migration table id.</li>
<li>#2458 Replace <cite>composer install</cite> by <cite>composer require</cite></li>
<li>#2450 CRITICAL when $_SESSION is null / Argument 2 passed to dot_array_search() must be []</li>
<li>#2449 User Guide: Query Builder selectCount - error correction in example</li>
<li>#2447 Existing File checks (Nowackipawel/patch-69)</li>
<li>#2446 DB Insert Ignore (Tada5hi/database-feature)</li>
<li>#2438 Nice array view in debug toolbar</li>
<li>#2436 Fix Message method reference</li>
<li>#2433 Inserting through a model should respect all validation rules. Fixes #2384</li>
<li>#2432 Fix curly brace deprecation in php 7.4</li>
<li>#2429 fix. safe_mailto multi-byte safe</li>
<li>#2427 Add $recipients property to ConfigEmail</li>
<li>#2426 Add hex validation rule, test, Guide</li>
<li>#2425 fix: Router setDefaultNameSpace can’t worker</li>
<li>#2422 Don’t show duplicate Date headers when running under PHPs server.</li>
<li>#2420 Change current_url() to use cloned URI</li>
<li>#2417 Revise Encryption Service Documentation</li>
<li>#2416 Add missing closing braces of condition ‘hasError()’</li>
<li>#2415 Add ‘nullable’ to MySQL field data</li>
<li>#2413 fix. toolbar file 301</li>
<li>#2411 fix parse params of plugin</li>
<li>#2408 Ensure previous_url() gets accurate URI.</li>
<li>#2407 Fix url helper functions to work when site hosted in subfolders.</li>
<li>#2406 Fix issue #2391 CodeIgniter::display404errors()</li>
<li>#2402 Removed pointless isset() check</li>
<li>#2401 Remove pointless check from conditional</li>
<li>#2400 Remove redundant check in conditionals</li>
<li>#2399 Revise Controllers Documentation</li>
<li>#2398 Edit .htaccess</li>
<li>#2392 Add validation function <cite>is_not_unique</cite></li>
<li>#2389 Confer silent status to nested seeders</li>
<li>#2388 Fix copypaste command comment</li>
<li>#2387 Use only digits for migrations order</li>
<li>#2382 quick fix postgresql insert id</li>
<li>#2381 Fix: Use of CodeIgniterConfigServices prevents Service overriding</li>
<li>#2379 Replace null log file extension check</li>
<li>#2377 Docs Rev: Replacing Core Classes</li>
<li>#2369 Remove LoggerAwareTrait from Email class</li>
<li>#2368 Remove log_message from Email::__construct</li>
<li>#2364 Email config doesn’t incorporate .env items</li>
<li>#2362 Fix SMTP protocol problem</li>
<li>#2359 Bugfix Model after event data</li>
<li>#2358 Fix Logger config</li>
<li>#2356 Fix typo in comments of Services.php</li>
<li>#2352 Fix method name to ‘toDateString()’ in Date and Times user guide</li>
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