CODE EXAMPLE FOR PHP

register column types octobercms

public function registerListColumnTypes()
{
    return [
        // A local method, i.e $this->evalUppercaseListColumn()
        'uppercase' => [$this, 'evalUppercaseListColumn'],

        // Using an inline closure
        'loveit' => function($value) { return 'I love '. $value; }
    ];
}

public function evalUppercaseListColumn($value, $column, $record)
{
    return strtoupper($value);
}