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I am using a plugin that was using get_blog_option and it no longer works. I looked up the call and it doesn't work because it's a wpmu function only.
Is there an equivalent method that I can use for a regular non-wpmu site?
Use get_option() instead. The get_option() method returns an option for the current blog.
In single site installation, the current blog is the only blog. So get get_option() returns the option for it.
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