What are the potential issues with using multiple databases in a PHP project?

One potential issue with using multiple databases in a PHP project is the complexity of managing connections and queries for each database. To solve this, you can create separate database connection files for each database and use them as needed in your project. 

// db1_connection.php
$host1 = 'localhost';
$user1 = 'username1';
$password1 = 'password1';
$database1 = 'database1';

$connection1 = new mysqli($host1, $user1, $password1, $database1);

if ($connection1->connect_error) {
    die("Connection failed: " . $connection1->connect_error);
}

// db2_connection.php
$host2 = 'localhost';
$user2 = 'username2';
$password2 = 'password2';
$database2 = 'database2';

$connection2 = new mysqli($host2, $user2, $password2, $database2);

if ($connection2->connect_error) {
    die("Connection failed: " . $connection2->connect_error);
}

Keywords

MySQL PostgreSQL database connection data consistency performance bottleneck

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