How can i turn these into groups of 4 instep of 2? - php

Question

So this is my code it takes a list o people from the database and lists them with their partners in groups. Within these groups, the user id of the people cannot appear in the same row twice. Everything works, Im just wondering how to make it echo 4 people per group versus only 2.
if ($result = $mysqli->query("SELECT * FROM performers")) {
printf("Found %d rows.\n", $result->num_rows);
$rows = array();
while ($row = $result->fetch_array()) {
foreach ($row as $key => $col) {
unset($row[$key]);
$row[strtolower($key)] = $col;
}
$rows[] = $row;
}
$current = null;
$count = 1;
while ( ! empty($rows)) {
if ($current) {
$current_performers = array($current['performerid_1'], $current['performerid_2']);
$found = false;
foreach ($rows as $key => $row) {
if ( ! in_array($row['performerid_1'], $current_performers) && ! in_array($row['performerid_2'], $current_performers)) {
$found = $key;
break;
}
}
if ($found !== false) {
echo '<li>', $rows[$found]['performance_id'], ': ', $rows[$found]['perf_name_1'], ' - ', $rows[$found]['perf_name_2'], '</li>';
unset($rows[$key]);
}
else {
echo '';
}
echo '</ul><hr />';
$current = null;
} else {
$current = array_shift($rows);
echo '<h3>Group ', $count+, '</h3>';
echo '<ul>';
echo '<li>', $current['performance_id'], ': ', $current['perf_name_1'], ' - ', $current['perf_name_2'], '</li>';
}
}

Answer 1

I think this should do it, but I haven't tested it (except to verify syntax) because I don't have any sample data.
$group_size = 4;
$current_performers = array();
$current_size = 0;
$count = 1;
while (!empty($rows)) {
if ($current_size == $group_size) { // End previous group
echo '</ul><hr>';
$current_performers = array();
$current_size = 0;
}
if ($current_size == 0) {
echo '<h3>Group ', $count++, '</h3>';
echo '<ul>';
}
$found = false;
foreach ($rows as $key => $row) {
if ( ! in_array($row['performerid_1'], $current_performers) && ! in_array($row['performerid_2'], $current_performers)) {
$found = true;
array_push($current_performers, $row['performerid_1'], $row['performerid_2']);
$current_size++;
echo '<li>', $row['performance_id'], ': ', $row['perf_name_1'], ' - ', $row['perf_name_2'], '</li>';
unset($rows[$key]);
break;
}
}
if (!$found) {
// Force a new group to start
$current_size = $group_size;
}
// If we have an unfinished group, finish it
if ($current_size) {
echo '</ul><hr>';
}
}