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, khoảng trắng, hay thứ tự nào)
preg_match_all('#src=["\'](https?://[^"\']+)["\']#i', $content, $src_matches);
$all_src = $src_matches[1] ?? [];
if (empty($all_src)) {
continue;
}
$changed = false;
// iframe đầu tiên → embed
if (!empty($all_src[0])) {
$first_iframe = '';
update_post_meta($id, 'embed', $first_iframe);
$changed = true;
}
// iframe thứ 2 → embed_1 (nếu có)
if (!empty($all_src[1])) {
$second_iframe = '';
update_post_meta($id, 'embed_1', $second_iframe);
$changed = true;
}
// XÓA HẾT IFRAME TRONG NỘI DUNG
$clean_content = preg_replace('#
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