How to check whether functions is deprecated or not?

If you want to develop a plugin or theme, you need a set of development toolkit. Use the Developer plugin to install debug bar and debug monitor. Those will tell you which function is deprecated if yes.

Moreover, when you develop plugin. You should read the document of WordPress and whatever plugin you are going to integrate with. It will tell you what version does functions support. Compare it with the version you want to develop with.

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