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yii\base\View has special $params property.

For example it's used for building breadcrumbs in default generated CRUD code templates with Gii.

You can set it like this before rendering:

use Yii;

Yii::$app->view->params['customParam'] = 'customValue';
Inside a controller you can set it like this:

$this->view->params['customParam'] = 'customValue';
Then it will be available in views (including main layout):

/* @var $this yii\web\View */

echo $this->params['customParam'];

<table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><a href="#L-1"> 1</a> <a href="#L-2"> 2</a> <a href="#L-3"> 3</a> <a href="#L-4"> 4</a> <a href="#L-5"> 5</a> <a href="#L-6"> 6</a> <a href="#L-7"> 7</a> <a href="#L-8"> 8</a> <a href="#L-9"> 9</a> <a href="#L-10">10</a> <a href="#L-11">11</a> <a href="#L-12">12</a> <a href="#L-13">13</a> <a href="#L-14">14</a> <a href="#L-15">15</a> <a href="#L-16">16</a> <a href="#L-17">17</a></pre></div></td><td class="code"><div class="highlight"><pre><span></span><span id="L-1"><a name="L-1"></a>yii\base\View has special $params property. </span><span id="L-2"><a name="L-2"></a> </span><span id="L-3"><a name="L-3"></a>For example it&#39;s used for building breadcrumbs in default generated CRUD code templates with Gii. </span><span id="L-4"><a name="L-4"></a> </span><span id="L-5"><a name="L-5"></a>You can set it like this before rendering: </span><span id="L-6"><a name="L-6"></a> </span><span id="L-7"><a name="L-7"></a>use Yii; </span><span id="L-8"><a name="L-8"></a> </span><span id="L-9"><a name="L-9"></a>Yii::$app-&gt;view-&gt;params[&#39;customParam&#39;] = &#39;customValue&#39;; </span><span id="L-10"><a name="L-10"></a>Inside a controller you can set it like this: </span><span id="L-11"><a name="L-11"></a> </span><span id="L-12"><a name="L-12"></a>$this-&gt;view-&gt;params[&#39;customParam&#39;] = &#39;customValue&#39;; </span><span id="L-13"><a name="L-13"></a>Then it will be available in views (including main layout): </span><span id="L-14"><a name="L-14"></a> </span><span id="L-15"><a name="L-15"></a>/* @var $this yii\web\View */ </span><span id="L-16"><a name="L-16"></a> </span><span id="L-17"><a name="L-17"></a>echo $this-&gt;params[&#39;customParam&#39;]; </span></pre></div> </td></tr></table>