What potential pitfalls should be avoided when writing a PHP program to generate schedules for events with multiple groups?

When writing a PHP program to generate schedules for events with multiple groups, one potential pitfall to avoid is not properly handling conflicts or overlaps in scheduling for different groups. To solve this issue, you can implement a function that checks for conflicts between events and groups before finalizing the schedule. 

<?php
function generateSchedule($events) {
    $schedule = [];
    
    foreach ($events as $event) {
        $conflict = false;
        
        foreach ($schedule as $existingEvent) {
            if ($event['group'] == $existingEvent['group'] && 
                ($event['start'] < $existingEvent['end'] && $event['end'] > $existingEvent['start'])) {
                $conflict = true;
                break;
            }
        }
        
        if (!$conflict) {
            $schedule[] = $event;
        }
    }
    
    return $schedule;
}

// Example usage
$events = [
    ['group' => 'A', 'start' => '10:00', 'end' => '12:00'],
    ['group' => 'B', 'start' => '11:00', 'end' => '13:00'],
    ['group' => 'A', 'start' => '14:00', 'end' => '16:00'],
];

$schedule = generateSchedule($events);

print_r($schedule);
?>

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