One possible way to do this is to check whether a specific class or function that is included in the plugin is defined, with class_exists() or function_exists(), respectively.
For Gutenberg, you could check for register_block_type():
1 2 3 | if ( function_exists( 'register_block_type' ) ) { // Gutenberg is available. } |
I would however side with Mark Kaplun to say this is not a good idea in most cases, and it is not even necessary if you follow best practices.
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