18 lines
773 B
PHP
18 lines
773 B
PHP
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<?php
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declare(strict_types=1);
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function calculate_duration_hours(?string $start, ?string $end, ?float $manualHours = null): ?float
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{
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if ($manualHours !== null) {
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return $manualHours >= 0 ? round($manualHours, 2) : null;
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}
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if ($start === null || $end === null || !preg_match('/^\d{2}:\d{2}$/', $start) || !preg_match('/^\d{2}:\d{2}$/', $end)) {
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return null;
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}
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[$startHour, $startMinute] = array_map('intval', explode(':', $start));
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[$endHour, $endMinute] = array_map('intval', explode(':', $end));
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if ($startHour > 23 || $endHour > 23 || $startMinute > 59 || $endMinute > 59) return null;
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$minutes = ($endHour * 60 + $endMinute) - ($startHour * 60 + $startMinute);
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return $minutes > 0 ? round($minutes / 60, 2) : null;
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}
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