Show array of elements from a input/checkboxes selection

Hello, I have a input/checkboxes selection: 

$colaz_label = elgg_echo ('Select ....:'); 
$colaz_input = elgg_view ('input/checkboxes', array (
'align' => 'horizontal',
'value' => array(),
'disabled' => false,
'options' => array(
'ex1'=> elgg_echo ('ex1'),
'ex2'=> elgg_echo ('ex2'),
'ex3'=> elgg_echo ('ex3'),

'ex4'=> elgg_echo ('ex4')

),

'name' => 'colaz',
));

If i select more than one element, in output it shows me "Array" and not the selected elements.

How could I do if I want to show every selected element by an array in this instraction?? 

 $body.= "<label>" . elgg_echo("Food") . "</label>: " . $blog->colaz . "<br />";

Thank you!!! 

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