39 Zeilen
1.022 B
PHP
39 Zeilen
1.022 B
PHP
<?php
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/**
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* SM-2 Spaced Repetition Algorithm
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* Ratings: easy=5, medium=3, hard=2, wrong=0
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*/
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function sm2_calculate($rating_name, $current_ease, $current_interval, $current_reps) {
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$rating_map = ['wrong' => 0, 'hard' => 2, 'medium' => 3, 'easy' => 5];
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$q = $rating_map[$rating_name] ?? 3;
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$ease = $current_ease;
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$interval = $current_interval;
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$reps = $current_reps;
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if ($q < 3) {
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$reps = 0;
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$interval = 1;
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} else {
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if ($reps === 0) {
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$interval = 1;
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} elseif ($reps === 1) {
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$interval = 3;
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} else {
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$interval = (int) round($interval * $ease);
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}
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$reps++;
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}
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$ease = $ease + 0.1 - (5 - $q) * (0.08 + (5 - $q) * 0.02);
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if ($ease < 1.3) $ease = 1.3;
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$next_review = date('Y-m-d', strtotime("+{$interval} days"));
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return [
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'ease_factor' => round($ease, 2),
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'interval_days' => $interval,
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'repetitions' => $reps,
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'next_review' => $next_review
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];
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}
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