How to see the array results of the generated table in php - php

Question

So this is the some part of the code I study:
if ($handle) {
while (($line = fgets($handle)) !== false) {
$exploded_line = explode("::", $line);
$day = date("j", $exploded_line[0]);
$action = trim($exploded_line[4]);
if ($action == LOGIN_ACTION) {
$details[$exploded_line[3]][$day] = isset($details[$exploded_line[3]][$day]) ? $details[$exploded_line[3]][$day] + 1 : 1;
} else if ($action == COMPANY_TICKETS_ACTION || $action == MYTICKETS_ACTION) {
$company_mytickets_action[$day] = isset($company_mytickets_action[$day]) ? $company_mytickets_action[$day] + 1 : 1;
} else if ($action == NEW_TICKET_ACTION) {
$new_ticket_action[$day] = isset($new_ticket_action[$day]) ? $new_ticket_action[$day] + 1 : 1;
} else if ($action == SEARCH_ACTION) {
$search_action[$day] = isset($search_action[$day]) ? $search_action[$day] + 1 : 1;
} else if ($action == PREFERENCES_ACTION) {
$preferences_action[$day] = isset($preferences_action[$day]) ? $preferences_action[$day] + 1 : 1;
}
}
} else {
$data['html'] = ERR_MSG;
}
fclose($handle);
print_r();
foreach ($details as $users => $value) {
$data['html'] .= "<tr><td>$users</td>";
for ($x = 1; $x <= $calendar_days; $x++){
//$details[$users][$x] = empty($details[$users][$x]) ? SPACE : $details[$users][$x];
if(empty($details[$users][$x]))
$details[$users][$x]='';
else
$details[$users][$x];
$data['html'] .= "<td>" . $details[$users][$x] . "</td>";
$unique[$x] = $details[$users][$x] == SPACE ? $unique[$x] : $unique[$x] + 1;
$total[$x] = $details[$users][$x] == SPACE ? $total[$x] : $total[$x] + $details[$users][$x];
}
$data['html'] . "</tr>";
}
Now I want to var_dump the results to array. I try this print_r($details[$exploded_line[3]][$day]); but there is no display in the browser. How can I get the results in array? Thanks