mysql 擴展已棄用，將來會被刪除：改用 mysqli 或 PDO [重複]

問題：

This question already has answers here : 這個問題在這裏已經有了答案：

Why shouldn't I use mysql_* functions in PHP? 爲什麼我不應該在 PHP 中使用 mysql_* 函數？ (12 answers) (12 個回答)

Closed 7 years ago . 7年前關閉。

When I attempt to connect to a MySQL server from PHP, I see the following error:當我嘗試從 PHP 連接到 MySQL 服務器時，我看到以下錯誤：

Deprecated: The mysql extension is deprecated and will be removed in the future: use mysqli or PDO instead in /path/to/filename.php on line 123已棄用：mysql 擴展已棄用，將來會被刪除：在第 123 行的 /path/to/filename.php 中使用 mysqli 或 PDO 代替

The code on the referenced line is:引用行上的代碼是：

mysql_connect($server, $username, $password);

I am certain that the arguments are correct, and this exact code has been working for years without problem.我確信這些論點是正確的，這個確切的代碼多年來一直沒有問題。 Indeed, I obtained it from a well-sourced tutorial on PHP.事實上，我是從一個關於 PHP 的資源豐富的教程中獲得的。

1. Why is this happening?爲什麼會這樣？

2. How can I fix it?我該如何解決？

3. I understand that it's possible to suppress deprecation errors by setting error_reporting in php.ini to exclude E_DEPRECATED :我知道可以通過在php.ini設置error_reporting來排除E_DEPRECATED來抑制棄用錯誤：

   error_reporting = E_ALL ^ E_DEPRECATED

   What will happen if I do that?如果我這樣做會發生什麼？

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解決方案：

參考一： https://en.stackoom.com/question/wVie
參考二： https://stackoom.com/question/wVie