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Panggil db_connect dua kali, satu db_connect terus, kali kedua total, tak tahu kenapa cikgu tak buat error,

Salah satu cara tulis semula kaedah mendapatkan jumlah nombor dalam kaedah paging dan tetapkan kepada pembolehubah

????/**
?????*?@param?$table
?????*?@param?$where
?????*?@param?$page
?????*?@param?$num
?????*?@param?string?$order
?????*?@return?array
?????*/
????public?static?function?pagination($table,?$where,?$page,?$num,?$order=''){
????????$conn?=self::db_connect();
????????$count=0;
????????$count_sql?=?"SELECT?count(*)?as?count?FROM?{$table}";
????????if($where){
????????????$count_sql?.="?WHERE?".self::getwhere($where);
????????}
//????????exit($count_sql);
????????if($count_result?=?$conn->query($count_sql)){
????????????$row?=?$count_result->fetch_assoc();
????????????$count?=?$row['count'];
????????}
????????$total_page?=?ceil($count/$num);//總頁(yè)數(shù)
????????$page=max(1,$page);?//?處理$page,max(min,max)?返回最大數(shù)
????????$offset?=?($page-1)*$num;//?每頁(yè)的起始數(shù)
????????//?拼接查詢(xún)的SQL
????????$sql?=?"SELECT?*?FROM?{$table}";
????????if($where){
????????????$sql?.='?WHERE?'.self::getwhere($where);
????????}
????????if($order){
????????????$sql?.=?"?ORDER?BY?{$order}";
????????}
????????$sql?.="?LIMIT?{$offset}?,?{$num}";
????????$rows=[];
????????if($result?=?$conn->query($sql)){
????????????while($row?=?$result->fetch_assoc()){
????????????????$rows[]=$row;
????????????}
????????????mysqli_free_result($result);
????????}
????????$conn->close();
????????return?array('total'=>$count,'page'=>$page,'num'=>$num,'total_page'=>$total_page,'lists'=>$rows);
????}

跟我的一樣的問(wèn)題
Notis: Pembolehubah tidak ditentukan: db dalam?D:xuexicoredb.php?pada baris?18

Notis: Pembolehubah tidak ditentukan: db dalam?D:xuexicoredb.php?no?baris?18:db?php?dalam baris?18: :xuexicoredb.php?pada talian?18

Notis: Pembolehubah tidak ditentukan: db dalam?D:xuexcoredb.php?pada talian?18

Amaran: mysqli_connect(): (HY000/1045): Akses ditolak untuk pengguna ''@'singlehost' kata laluan: TIDAK) dalam?D:xuexicoredb.php?pada talian?18
Sambungan gagal:Akses ditolak untuk pengguna ''@'localhost' (menggunakan kata laluan: NO)

Teragak-agak

Kata laluan pangkalan data salah.