What is the error message "Fatal error: Uncaught Error: Call to undefined function mysql_connect()" indicating in the PHP code?

The error message "Fatal error: Uncaught Error: Call to undefined function mysql_connect()" indicates that the code is trying to use the deprecated MySQL extension in PHP, which is no longer supported in newer versions of PHP. To solve this issue, you need to switch to either the MySQLi or PDO extension for database connectivity. 

// Corrected PHP code using MySQLi extension
$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);
}

echo "Connected successfully";

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Fatal error Uncaught Error Call to undefined function mysql_connect PHP code

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