Moving empty values of an array to the last position - php

Question

I'm pulling an array from an external API, And I've got some help with usort on here, And It pushes it to the bottom, and empty values are on top. I tried using unset but that just emptied out my entire realArrival values.
e.g.
$fromThis = array(
"realArrival": "",
"realArrival": "Confirm. 06:18",
"realArrival": "Confirm. 06:19"
);
Into:
$intoThis = array(
"realArrival": "Confirm. 06:18",
"realArrival": "Confirm. 06:19",
"realArrival": ""
);
Here is my code on how I tried to do it. I'm sure you are shaking your head at this but here it goes.
$url = 'http://apis.is/flight?language=en&type=arrivals';
$json = file_get_contents($url);
$results = json_decode($json, TRUE);
$results = $results['results'];
function cmp($a, $b) {
return strcmp($a['realArrival'], $b['realArrival']);
}
//Sort Time
usort($results, "compare_time");
function compare_time($a,$b) {
$splitA= count(explode(' ',$a['realArrival']));
$splitB= count(explode(' ',$a['realArrival']));
if($splitA==2 && $splitB==2)
{
$first_time = strtotime(explode(' ',$a['realArrival'])[1]);
$second_time = strtotime(explode(' ',$b['realArrival'])[1]);
if($first_time==$second_time)
{
return strcmp($b['realArrival'], $a['realArrival']);
}
return ($second_time < $first_time) ? 1: 0;
}
return strcmp($a['realArrival'], $b['realArrival']);
}
echo '<table class="highlight bordered responsive-table grey darken-2 col s6">';
echo "<tr>";
echo '<th>Date</th>';
echo '<th>Flight Number</th>';
echo '<th>Airline</th>';
echo '<th>From</th>';
echo '<th>Schedule. Time</th>';
echo '<th>Status</th>';
echo "</tr>";
foreach ($results as $item => $val) {
echo "<tr>";
echo '<td>'.$val['date'].'</td>';
echo '<td>'.$val['flightNumber'].'</td>';
echo '<td>'.$val['airline'].'</td>';
echo '<td>'.$val['from'].'</td>';
echo '<td>'.$val['plannedArrival'].'</td>';
// HERE I TRIED TO TARGET THE EMPTY VALUES
if ($val === "") {
unset($results[$item]);
$results[] = $val;
echo '<td style="font-weight: bold;">'.$val['realArrival'].'</td>';
}
echo '</tr>';
}

Answer 1

I know this might seem clunky, but you could always just do something like...
$items_with_real_arrivals = array();
$items_without_real_arrivals = array();
foreach ($results as $item => $val) {
if ($item[‘realArrival’] === "") { $items_without_real_arrivals.push($item); }
else $items_with_real_arrivals.push($item);
}
$reordered_items = array();
for ($i=0; $i<count($items_with_real_arrivals); $i++) {
$reordered_items.push($item);
}
for ($i=0; $i<count($items_without_real_arrivals); $i++) {
$reordered_items.push($item);
}
foreach ($reordered_items as $item => $val) {
echo "<tr>";
echo ' <td>'.$val['date'].'</td>';
echo ' <td>'.$val['flightNumber'].'</td>';
echo ' <td>'.$val['airline'].'</td>';
echo ' <td>'.$val['from'].'</td>';
echo ' <td>'.$val['plannedArrival'].'</td>';
echo ' <td style="font-weight:bold;">' . $val['realArrival'].'</td>';
echo '</tr>';
}