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>[danger] 增删改 ``` pdo_query($sql); ``` >[danger] 查询 ``` pdo_fetch("SELECT * FROM " . tablename('users') . " WHERE id = :id", [':id' => 1]); ``` ``` pdo_fetchall("SELECT * FROM " . tablename('users') . " WHERE id = :id", [':id' => 1]); ```