PHP 中的 mysqli select db函数

mysqli select db - 语法

mysqli_select_db(connection,dbname);

此函数更改默认数据库。

mysqli select db - 返回值

成功时返回TRUE，失败时返回FALSE

mysqli select db - 示例

<?php
   $connection_mysql=mysqli_connect("localhost","user","password","db");
   
   if (mysqli_connect_errno($connection_mysql)){
      echo "Failed to connect to MySQL: " . mysqli_connect_error();
   }
   
   mysqli_select_db($connection_mysql,"test");
   mysqli_close($connection_mysql);
?>