php如何匹配markdown中能解析的图片格式?

Question

问题如图

求解

Answer 1

尝试一下

function extractMarkdownImages($markdown) {
    $images = [];
    
    // 匹配标准格式 ![alt](url)
    preg_match_all('/!\[(.*?)\]\((.*?)(\s+"(.*)")?\)/', $markdown, $matches);
    
    if (!empty($matches[2])) {
        foreach ($matches[2] as $index => $url) {
            $alt = $matches[1][$index] ?? '';
            $title = !empty($matches[4][$index]) ? $matches[4][$index] : '';
            
            $images[] = [
                'url' => $url,
                'alt' => $alt,
                'title' => $title
            ];
        }
    }
    
    // 匹配参考式格式
    $references = [];
    preg_match_all('/\[(.*?)\]:\s*(.*?)(\s+"(.*)")?\s*$/m', $markdown, $refMatches);
    
    if (!empty($refMatches[1])) {
        foreach ($refMatches[1] as $index => $id) {
            $references[$id] = [
                'url' => $refMatches[2][$index],
                'title' => !empty($refMatches[4][$index]) ? $refMatches[4][$index] : ''
            ];
        }
    }
    
    // 查找参考式图片引用
    preg_match_all('/!\[(.*?)\]\[(.*?)\]/', $markdown, $refImageMatches);
    
    if (!empty($refImageMatches[2])) {
        foreach ($refImageMatches[2] as $index => $id) {
            $id = empty($id) ? $refImageMatches[1][$index] : $id;
            
            if (isset($references[$id])) {
                $images[] = [
                    'url' => $references[$id]['url'],
                    'alt' => $refImageMatches[1][$index],
                    'title' => $references[$id]['title']
                ];
            }
        }
    }
    
    return $images;
}