Example output of get_all_custom_field_meta()

output.php

<?php
array(
	'prefix_subtitle'    => 'This is the subtitle',
	'prefix_content_row' => array(
		array(
			'css_classes'      => 'extra-class row-1',
			'background_color' => '1',
			'columns'          => array(
				array(
					'column' => 'Row 1 column 1',
				),
				array(
					'column' => 'Row 1 column 2',
				),
			),
		),
		array(
			'css_classes'      => 'extra-class row-2',
			'background_color' => '3',
			'columns'          => array(
				array(
					'column' => 'Row 2 column 1',
				),
				array(
					'column' => 'Row 2 column 2',
				),
				array(
					'column' => 'Row 2 column 3',
				),
			),
		),
	),
);