如何編寫通過ssh連接mysql的php代碼

shell _ exec(" ssh-f-L 127 . 0 . 0 . 1:3307:127 . 0 . 0 . 1:3306 user@remote.rjmetrics.com睡眠60 & gt& gt日誌文件”)；$ db = mysqli _ connect(" 127 . 0 . 0 . 1 "，" sqluser "，" sqlpassword "，" rjmadmin "，3307)；