Are there any best practices for updating PHP code from older versions to newer versions?

When updating PHP code from older versions to newer versions, it is important to review the changes in the PHP documentation for each version to identify any deprecated functions or features that need to be updated. It is also recommended to test the code thoroughly after making the updates to ensure that it works correctly with the new version of PHP. 

// Example of updating code from PHP 5 to PHP 7
// PHP 5 code
mysql_connect('localhost', 'username', 'password');

// PHP 7 code
mysqli_connect('localhost', 'username', 'password');

Keywords

backward compatibility deprecated functions PHP migration code refactoring version control

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