连接到 mysql 数据库的函数

Question

我创建了第一个连接 mysql 数据库的函数。我有 index.php 和 functions.php 并且我将 functions.php 添加到 index.php！这是我连接到数据库的功能...

function connect_to_database()
{

/*** mysql hostname ***/
$hostname = 'localhost';

/*** mysql username ***/
$username = 'root';

/*** mysql password ***/
$password = '';

try {
$dbh = new PDO("mysql:host=$hostname;dbname=zadatak1", $username, $password);
/*** echo a message saying we have connected ***/
/**echo 'Connected to database';**/
}
catch(PDOException $e)
{
echo $e->getMessage();
}
return $dhb;

}

我不知道它是否正确，是否正确。

我输入index.php

<?php

require_once 'functions.php';

connect_to_database();

active_links();

include 'includes/head.php';

include 'includes/nav.php';

.......

Answer 1

查看评论：

function connect_to_database()
{

   /*** mysql hostname ***/
   $hostname = 'localhost';

   /*** mysql username ***/
   $username = 'root';

   /*** mysql password ***/
   $password = '';

   $dbh = false; // initialized for error

   try {
      $dbh = new PDO("mysql:host=$hostname;dbname=zadatak1", 
                    $username, $password);
      /*** echo a message saying we have connected ***/
      /**echo 'Connected to database';**/
   }
   catch(PDOException $e)
   {
       echo $e->getMessage();
       // consider to exit / throw own exception / stop continuing script anyhow ....
   }

   // returns false on error
   return $dbh; // typo here, was $dhb !!  
}

用法：

$DB = connect_to_database(); 

if ( $DB !== false )
    $DB->function();

Answer 2

所以它现在工作正常，这就是答案！谢谢你的帮助

我创建了名为 config.php

的文件

// PDO connect *********
function connect() 
{
    $host = 'localhost';
    $db_name = 'database_name';
    $db_user = 'root';
    $db_password = '';
    return new PDO('mysql:host='.$host.';dbname='.$db_name, $db_user, $db_password, array(PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION, PDO::MYSQL_ATTR_INIT_COMMAND => "SET NAMES utf8"));
}

然后像这样调用连接函数，$pdo = connect();或 var 的任何名称，但就是这样！

<?php

include 'config.php';

$pdo = connect();

........

连接到 mysql 数据库的函数

Function for connecting to mysql database

php

mysql

pdo

function