Error in access function variable as static variable

Question

In my demo project I want to access static variable of some class, but those variable name are passing dynamically. am trying to use function variable like given below:

public function filterBy($params) { foreach ($params as $key=>$value) { $filter_field_name = strtoupper($key); $this->criteria->add(ProductPeer::$filter_field_name, $value, Criteria::EQUAL); } return $this; }

It gives me error

Fatal error: Access to undeclared static property: ProductPeer::$filter_field_name in /home/sfprojects/shopme/lib/product/ProductDb.php on line 47

Though if I use ProductPeer::STATUS instead of ProductPeer::$filter_field_name then it works.

What's wrong here?

JSchirrmacher · Accepted Answer · 2016-06-03 07:26:57Z

1

There is a function constant() that can do this:

constant('ProductPeer::' . $filter_field_name);

answered Jun 3, 2016 at 7:26

JSchirrmacher

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2 Comments

Rupal Javiya Over a year ago

Yup, works perfect! thanks. though I don't know reason behind it, if you can tell reason behind access via constant function then it would be helpful

JSchirrmacher Over a year ago

I suppose that the $ accesses only properties of the class, whereas constants are a separate language construct which works different.

Review Rights · Accepted Answer · 2016-06-08 05:32:11Z

$this->criteria->add(ProductPeer::$$filter_field_name, $value, Criteria::EQUAL);

Use double dollar sign for reference of other variable. Like $$filter_field_name

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