What potential issues can arise when a PHP script stops functioning after a provider updates the PHP version?

When a PHP script stops functioning after a provider updates the PHP version, it could be due to deprecated functions or changes in syntax that are no longer supported. To solve this issue, the script needs to be updated to use the latest PHP syntax and functions that are compatible with the new PHP version.

// Example of updating deprecated function mysql_connect to mysqli_connect
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "database";

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

// Check connection
if (!$conn) {
    die("Connection failed: " . mysqli_connect_error());
}
echo "Connected successfully";