ai写作辅助检测
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230
application/common/AiWritingRiskAnalysisService.php
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230
application/common/AiWritingRiskAnalysisService.php
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<?php
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namespace app\common;
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/**
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* 编辑辅助：AI 辅助写作风险综合分析
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*/
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class AiWritingRiskAnalysisService
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{
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/**
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* @param array $parsedData parseManuscriptStructure 的 data 字段
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*/
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public function buildReport(array $parsedData): array
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{
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$templateStats = (array) ($parsedData['template_sentence_stats'] ?? []);
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$repeatedStats = (array) ($parsedData['repeated_phrases'] ?? []);
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$sentenceStats = (array) ($parsedData['sentence_stats'] ?? []);
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$dimensions = [
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$this->analyzeTemplateSentenceRisk($templateStats),
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$this->analyzeRepeatedPhraseRisk($repeatedStats),
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$this->analyzeSentenceLengthRisk($sentenceStats),
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];
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$overallScore = 0;
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$levelRank = ['low' => 1, 'medium' => 2, 'high' => 3];
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$maxRank = 1;
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$flags = [];
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foreach ($dimensions as $dimension) {
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$overallScore += intval($dimension['score'] ?? 0);
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$rank = $levelRank[$dimension['level'] ?? 'low'] ?? 1;
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if ($rank > $maxRank) {
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$maxRank = $rank;
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}
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foreach ((array) ($dimension['flags'] ?? []) as $flag) {
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if ($flag !== '') {
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$flags[] = $flag;
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}
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}
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}
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$overallLevel = array_search($maxRank, $levelRank, true) ?: 'low';
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return [
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'overall_level' => $overallLevel,
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'overall_score' => min(100, $overallScore),
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'summary' => $this->buildSummary($overallLevel, $dimensions, $flags),
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'dimensions' => $dimensions,
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'flags' => array_values(array_unique($flags)),
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];
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}
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private function analyzeTemplateSentenceRisk(array $stats): array
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{
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$items = (array) ($stats['items'] ?? []);
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$totalMatches = intval($stats['total_matches'] ?? 0);
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$matchedRuleCount = intval($stats['matched_rule_count'] ?? 0);
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$score = 0;
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$flags = [];
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foreach ($items as $item) {
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$count = intval($item['count'] ?? 0);
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$riskLevel = max(1, intval($item['risk_level'] ?? 1));
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$weight = max(1, intval($item['weight'] ?? 1));
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$score += $count * $riskLevel * $weight;
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if ($count > 0) {
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$section = (string) ($item['section'] ?? '');
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$remark = trim((string) ($item['remark'] ?? ''));
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$label = $remark !== '' ? $remark : (string) ($item['sentence_pattern'] ?? '');
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$flags[] = sprintf('%s段命中模版句：%s（%d次）', $section, $label, $count);
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}
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}
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$level = $this->scoreToLevel($score, 15, 40);
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return [
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'key' => 'template_sentence',
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'name' => '模版句特征',
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'level' => $level,
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'score' => min(100, $score),
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'summary' => $totalMatches > 0
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? sprintf('命中 %d 条模版句规则，共 %d 处', $matchedRuleCount, $totalMatches)
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: '未检测到典型 AI 模版句',
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'metrics' => [
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'total_matches' => $totalMatches,
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'matched_rule_count' => $matchedRuleCount,
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],
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'details' => $stats,
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'flags' => array_slice($flags, 0, 8),
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];
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}
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private function analyzeRepeatedPhraseRisk(array $stats): array
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{
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$items = (array) ($stats['suspicious_items'] ?? []);
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if (empty($items)) {
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$items = array_values(array_filter((array) ($stats['items'] ?? []), function ($item) {
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return ($item['category'] ?? '') === 'suspicious';
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}));
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}
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$uniqueCount = count($items);
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$expectedCount = count((array) ($stats['expected_topic_items'] ?? []));
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$topCount = 0;
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$flags = [];
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foreach (array_slice($items, 0, 5) as $item) {
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$count = intval($item['count'] ?? 0);
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if ($count > $topCount) {
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$topCount = $count;
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}
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if ($count >= 4) {
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$flags[] = sprintf('可疑重复短语「%s」出现 %d 次', (string) ($item['phrase'] ?? ''), $count);
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}
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}
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$score = min(100, $uniqueCount * 3 + max(0, $topCount - 3) * 6);
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$level = 'low';
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if ($uniqueCount >= 10 || $topCount >= 8) {
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$level = 'high';
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} elseif ($uniqueCount >= 4 || $topCount >= 5) {
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$level = 'medium';
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}
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$summary = '未发现可疑机械重复短语';
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if ($uniqueCount > 0) {
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$summary = sprintf('发现 %d 组可疑重复短语，最高重复 %d 次', $uniqueCount, $topCount);
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} elseif ($expectedCount > 0) {
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$summary = sprintf('主题词正常重复 %d 组，未触发可疑短语', $expectedCount);
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}
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return [
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'key' => 'repeated_phrase',
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'name' => '重复短语',
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'level' => $level,
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'score' => $score,
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'summary' => $summary,
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'metrics' => [
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'suspicious_count' => $uniqueCount,
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'expected_topic_count' => $expectedCount,
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'top_count' => $topCount,
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],
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'details' => $stats,
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'flags' => $flags,
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];
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}
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private function analyzeSentenceLengthRisk(array $stats): array
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{
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$avg = floatval($stats['avg'] ?? 0);
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$std = floatval($stats['std'] ?? 0);
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$max = intval($stats['max'] ?? 0);
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$sentenceCount = intval($stats['sentence_count'] ?? 0);
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$score = 0;
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$flags = [];
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$level = 'low';
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if ($sentenceCount >= 8) {
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if ($avg >= 32) {
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$score += 20;
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$flags[] = sprintf('平均句长偏高（%.1f 词/句）', $avg);
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}
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if ($std > 0 && $std <= 5 && $avg >= 12 && $avg <= 28) {
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$score += 25;
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$flags[] = sprintf('句长分布过于均匀（均值 %.1f，标准差 %.1f）', $avg, $std);
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}
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if ($max >= 50) {
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$score += 10;
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$flags[] = sprintf('存在超长句（最长 %d 词）', $max);
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}
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}
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$level = $this->scoreToLevel($score, 10, 25);
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return [
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'key' => 'sentence_length',
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'name' => '句长特征',
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'level' => $level,
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'score' => min(100, $score),
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'summary' => $sentenceCount > 0
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? sprintf('平均句长 %.1f，标准差 %.1f，共 %d 句', $avg, $std, $sentenceCount)
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: '正文句长数据不足',
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'metrics' => [
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'avg' => $avg,
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'std' => $std,
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'max' => $max,
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'min' => intval($stats['min'] ?? 0),
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'sentence_count' => $sentenceCount,
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],
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'details' => $stats,
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'flags' => $flags,
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];
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}
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private function scoreToLevel(int $score, int $mediumThreshold, int $highThreshold): string
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{
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if ($score >= $highThreshold) {
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return 'high';
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}
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if ($score >= $mediumThreshold) {
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return 'medium';
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}
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return 'low';
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}
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private function buildSummary(string $overallLevel, array $dimensions, array $flags): string
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{
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$levelText = [
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'low' => '低风险',
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'medium' => '中等风险',
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'high' => '较高风险',
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];
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$parts = [$levelText[$overallLevel] ?? '低风险'];
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foreach ($dimensions as $dimension) {
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if (($dimension['level'] ?? 'low') === 'low') {
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continue;
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}
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$parts[] = $dimension['name'] . '需关注';
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}
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if (!empty($flags)) {
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$parts[] = '重点：' . $flags[0];
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}
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return implode('；', $parts);
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}
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}
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