How can the use of the deprecated mysql_ interface in PHP lead to errors when querying a database?

Using the deprecated mysql_ interface in PHP can lead to errors when querying a database because it is no longer supported in newer versions of PHP. To solve this issue, you should switch to using the mysqli or PDO extension for interacting with databases in PHP. 

// Using mysqli extension to connect to a database
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "database";

// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);

// Check connection
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}

Keywords

deprecated mysql_ interface errors database

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