您可能应该看看那是beeing的确切查询级联，因为其中存在语法错误。尝试查看最后的 $ where （或者更好的是整个查询，因为那是错误的内容）

You should probably look at the exact query thats beeing concatenated, since theres a syntax error in it. Try to look at what $where becomes in the end (or better, the entire query, since thats whats has the error)

猜测，最后一行的开头可能需要空格

Guessing, theres possibly a need for a space at the start of your last line

   $where = ' WHERE '.$where;