Are there any best practices for handling deprecated functions in PHP upgrades?

When upgrading PHP versions, it's important to handle deprecated functions properly to ensure compatibility with the new version. One best practice is to replace deprecated functions with their updated equivalents or alternative methods. This can be done by checking the PHP documentation for deprecated functions and finding suitable replacements.

// Deprecated function
$deprecatedResult = mysql_query($query);

// Updated equivalent
$updatedResult = mysqli_query($connection, $query);