protected function getCustomNumericFunctions()
    {
        $functions = (array) $this->getOption('custom_numeric_functions');

        return array_filter(
            $functions,
            function ($name) {
                return is_string($name);
            },
            ARRAY_FILTER_USE_KEY
        );
    }
protected function getCustomNumericFunctions()
    {
        $functions = (array) $this->getOption('custom_numeric_functions');

        return array_filter(
            $functions,
            function ($name) {
                return is_string($name);
            },
            ARRAY_FILTER_USE_KEY
        );
    }
protected function getCustomNumericFunctions ( ) { $ functions = ( array ) $ this -> getOption ( 'custom_numeric_functions' ) ; return array_filter ( $ functions , function ( $ name ) { return is_string ( $ name ) ; } , ARRAY_FILTER_USE_KEY ) ; }
Retrieve custom DQL numeric functions.

@return array
Retrieve custom DQL numeric functions .