How to look at _POST values coming to the controller (Yii) - php

Question

I read the book "Yii", I can't understand how to look at the global _POST array receiving by controller?
VIEW
_form.php
<div class="row">
<?php
echo $form->labelEx($model,'category_id');
echo CHtml::DropDownList('Page[category_id]','', Category::allCategory(),
array(
'ajax' => array(
'type'=>'POST', //request type
'url'=>CController::createUrl('subcategory/dynamicSubCategories'), //url to call.
//Style: CController::createUrl('currentController/methodToCall')
'update'=>'#Page_subcategory_id', //selector to update
// 'data'=>array('category_id'=>'js:this.value'),
//leave out the data key to pass all form values through
)));
echo $form->error($model,'category_id');
?>
</div>
<div class="row">
<?php
echo $form->labelEx($model,'subcategory_id');
echo CHtml::dropDownList('Page[subcategory_id]','', array());
echo $form->error($model,'subcategory_id');
?>
</div>
<div class="row buttons">
<?php echo CHtml::submitButton($model->isNewRecord ? 'Create' : 'Save'); ?>
</div>
SubcategoryController.php
public function actionDynamicSubCategories() {
$data = Subcategory::model()->findAllByAttributes(array('category_id' => $_POST['category_id']));
$data = CHtml::listData($data, 'id', 'title');
foreach ($data as $value => $name) {
echo CHtml::tag('option', array('value' => $value), CHtml::encode($name), true);
}
}
I'm interested in value from view echo CHtml::DropDownList('Page[category_id]','', Category::allCategory(), ... which comes to the controller SubcategoryController.php?

Answer 1

At the top of your controller you can just output the $_POST array.
e.g.
print_r($_POST);
or
var_dump($_POST);
This should show you any post values.

Answer 2

To get your _POST variable in Yii, you can use var_dump(Yii::app()->request->post);

Answer 3

In my situation into the controller passed this _POST (Page['category_id']).
I use in controller:
$x = Yii::app()->request->getPost('Page');
$y = $x['category_id'];
$data = Subcategory::model()->findAllByAttributes(array('category_id' => (int)$y));
Solved!