So have a simple Field a user can enter some IDs in:

<field name="ids" type="subform" min="1" multiple="true" layout="joomla.form.field.subform.repeatable-table" buttons="add,remove" groupByFieldset="false" label="IDs">
        <fieldset name="section1" label="Section1">
            <field name="id" label="ID" min="0" type="number" />

If i want fo get the IDs as a simple array. At the moment i do this:

$ids = array_column(json_decode(json_encode($this->params->get('ids')), TRUE), 'id');

That looks a bit weird, but i want to avoid using loops. Is there a framework friendly approach to this?

1 Answer 1


Since PHP 7 array_column() supports passing an array of objects. You would only need to cast the data to array:

$ids = array_column((array) $this->params->get('ids'), 'id');

On older PHP versions you could cast to array and use Joomla\Utilities\ArrayHelper::getColumn() which supports passing array of objects on all PHP versions:

use Joomla\Utilities\ArrayHelper;

$ids = ArrayHelper::getColumn((array) $this->params->get('ids'), 'id');

Or, alternatively, use Joomla\Utilities\ArrayHelper::fromObject() to recursively convert the object to an array and then use array_column():

use Joomla\Utilities\ArrayHelper;

$ids = array_column(ArrayHelper::fromObject($this->params->get('ids')), 'id');

I have not measured how performance compares to JSON encode/decode.

  • Sharky, does $this->params->get('ids') return an object of objects? Feb 18, 2021 at 21:52
  • 1
    Yes, repeatable subform normally stores data as an object of objects.
    – Sharky
    Feb 18, 2021 at 22:22

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