组保留的标签 余下为需要删除的标签
unset($oldtag[$key]);
}
}
}
if (!empty($oldtag)) {
$tagids = array();
foreach ($oldtag as $tagid => $tagname) {
$tagids[] = $tagid;
}
well_oldtag_delete($tagids, $tid);
}
$r = well_tag_process($tid, $fid, $create_tag, $tagarr);
return $r;
}
// 删除标签和绑定的主题
function well_oldtag_delete($tagids, $tid)
{
$pagesize = count($tagids);
$arrlist = well_tag_find_by_tagids($tagids, 1, $pagesize);
$delete_tagids = array(); // 删除
$tagids = array();
$n = 0;
foreach ($arrlist as $val) {
++$n;
if (1 == $val['count']) {
// 只有一个主题
$delete_tagids[] = $val['tagid'];
} else {
$tagids[] = $val['tagid'];
}
}
!empty($delete_tagids) and well_tag_delete($delete_tagids);
$arlist = well_tag_thread_find_by_tid($tid, 1, $n);
if ($arlist) {
$ids = array();
foreach ($arlist as $val) $ids[] = $val['id'];
well_tag_thread_delete($ids);
}
!empty($tagids) and well_tag_update($tagids, array('count-' => 1));
}
// 标签数据处理 $arr=新提交的数组 $tagarr=保留的旧标签
function well_tag_process($tid, $fid, $new_tags = array(), $tagarr = array())
{
if (empty($tid)) return '';
// 新标签处理入库
if ($new_tags) {
$threadarr = array();
$tagids = array();
$i = 0;
$size = 5;
$n = count($tagarr);
$n = $n > $size ? $size : $size - $n;
foreach ($new_tags as $name) {
++$i;
$name = trim($name);
$name = stripslashes($name);
$name = strip_tags($name);
$name = str_replace(array(' ', '#', "@", "$", "%", "^", '&', '·', '<', '>', ';', '`', '~', '!', '¥', '……', ';', '?', '?', '-', '—', '_', '=', '+', '.', '{', '}', '|', ':', ':', '、', '/', '。', '[', ']', '【', '】', '‘', ' ', ' ', ' ', ' ', ' '), '', $name);
$name = htmlspecialchars($name, ENT_QUOTES);
if ($name && $i <= $n) {
// 查询标签
$read = well_tag_read_name($name);
if ($read) {
// 存在 count+1
$tagids[] = $read['tagid'];
} else {
// 入库
$arr = array('name' => $name, 'count' => 1);
$tagid = well_tag_create($arr);
FALSE === $tagid and message(-1, lang('create_failed'));
$read = array('tagid' => $tagid, 'name' => $name);
}
$tag_thread = array('tagid' => $read['tagid'], 'tid' => $tid);
$threadarr[] = $tag_thread;
$tagarr[$read['tagid']] = $read['name'];
}
}
!empty($threadarr) and tag_thread_big_insert($threadarr);
!empty($tagids) and well_tag_update($tagids, array('count+' => 1));
}
$json = empty($tagarr) ? '' : xn_json_encode($tagarr);
return $json;
}
?> $v = implode(",", $v);
$temp[] = $v;
}
// 去掉重复的字符串,也就是重复的一维数组
$temp = array_unique($temp);
// 再将拆开的数组重新组装
$output = array();
foreach ($temp as $k => $v) {
if ($stkeep) $k = $starr[$k];
if ($ndformat) {
$temparr = explode(",", $v);
foreach ($temparr as $ndkey => $ndval) $output[$k][$ndarr[$ndkey]] = $ndval;
} else $output[$k] = explode(",", $v);
}
return $output;
}
// 合并二维数组 如重复 值以第一个数组值为准
function array2_merge($array1, $array2, $key = '')
{
if (empty($array1) || empty($array2)) return NULL;
$arr = array();
foreach ($array1 as $k => $v) {
isset($v[$key]) ? $arr[$v[$key]] = array_merge($v, $array2[$k]) : $arr[] = array_merge($v, $array2[$k]);
}
return $arr;
}
/*
* 对二维数组排序 两个数组必须有一个相同的键值
* $array1 需要排序数组
* $array2 按照该数组key排序
* */
function array2_sort_key($array1, $array2, $key = '')
{
if (empty($array1) || empty($array2)) return NULL;
$arr = array();
foreach ($array2 as $k => $v) {
if (isset($v[$key]) && $v[$key] == $array1[$v[$key]][$key]) {
$arr[$v[$key]] = $array1[$v[$key]];
} else {
$arr[] = $v;
}
}
return $arr;
}
?>
gcc:Wstrict-overflow; chatgpt 示例;assuming pointer wraparound does not occur when comparing P +- C1编程频道|福州电脑网
gcc:Wstrict-overflow; chatgpt 示例;assuming pointer wraparound does not occur when comparing P +- C1 编程之家 69 0
更新时间:2026-04-03 20:31:52
文章目录
描述
-Wstrict-overflow -Wstrict-overflow=n 第一句其实挺难理解,说这个undefine的意思是“未定义”,我们经常使用的地方就是“UB(undefined behavior)”,未定义行为。这一句的翻译就是:只有在符号数溢出未定义时才会激活这个选项。怎么才叫符号数溢出未定义? Human: 怎么理解“未定义符号溢出”? ChatGPT: 未定义符号溢出是指程序未明确定义如何处理溢出情况,即当某个特定的值超出一定的范围时,程序该如何处理这种情况。当使用-Wstrict-overflow参数时,编译器会检查程序中可能存在的溢出行为,并提供相应的提示。
This option is only active when signed overflow is undefined. It warns about cases where the compiler optimizes based on the assumption that signed overflow does not occur. Note that it does not warn about all cases where the code might overflow: it only warns about cases where the compiler implements some optimization. Thus this warning depends on the optimization level. An optimization that assumes that signed overflow does no
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本文标签: 示例 ChatGPT overflow Wstrict GCC
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