PHP discuz2.5 Open Source Community questions, novice solutions

PHP discuz2.5 Open Source Community questions for beginners
PHP discuz2.5 Open Source community questions, just learned PHP not long, now the construction site, need to use a plug-in, but the plugin is not compatible with the latest version, I would like to know how to modify a plugin to make it with the new version of Compatibility???? What needs to be changed????? Modify a plugin compatibility change how to do????? Asking for advice.

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The simplest way to see if there is no up-to-date.
Not just try to use the old plugin, look at the specific error message, modify the test. It's not a big change.
If still not, look for plugin-related writing examples, re-write one.

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