PHP mysqli_close() 函式

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定義和用法

mysqli_close() 函式接受一個 MySQL 函式物件（先前已開啟）作為引數，並將其關閉。

您不能使用此函式關閉持久連線。

語法

mysqli_close($con);

引數

返回值

PHP mysqli_close() 函式返回一個布林值，成功時為true，失敗時為false。

PHP 版本

此函式首次引入於 PHP 5 版本，並在所有後續版本中均有效。

示例

以下示例演示了mysqli_close() 函式的使用（以過程式風格）−

<?php
   $host = "localhost";
   $username  = "root";
   $passwd = "password";
   $dbname = "mydb";

   //Creating a connection
   $con = mysqli_connect($host, $username, $passwd, $dbname);

   //Closing the connection
   $res = mysqli_close($con);

   if($res){
      print("Connection Closed");
   }else{
      print("There is an issue while closing the connection");
   }
?>

這將產生以下結果−

Connection Closed

示例

在面向物件風格中，此函式的語法為$con->close(); 以下是此函式在面向物件風格中的示例 $minus;

<?php
   $host = "localhost";
   $username  = "root";
   $passwd = "password";
   $dbname = "mydb";

   //Creating a connection
   $con = new mysqli($host, $username, $passwd, $dbname);

   //Closing the connection
   $res = $con -> close();

   if($res){
      print("Connection Closed");
   }else{
      print("There is an issue while closing the connection");
   }
?>

這將產生以下結果−

Connection Closed

示例

這是另一個mysqli_close() 函式的示例−

<?php
   //Creating a connection
   $con = @mysqli_connect("localhost");
   $res = @mysqli_close($con);

   if($res){
      print("Connection closed Successfully");
   }else{
      print("Sorry there is an issue could close the connection ");
   }
?>

這將產生以下結果−

Sorry there is an issue could close the connection

示例

<?php
   $connection = @mysqli_connect("tutorailspoint.com", "use", "pass", "my_db");
   
   if (mysqli_connect_errno($connection)){
      echo "Failed to connect to MySQL: ".mysqli_connect_error();
   }else{
	   mysqli_close($connection);
   }   
?>

這將產生以下結果−

Failed to connect to MySQL: No connection could be made because the target machine actively refused it.