Overriding a Filter in WordPress and Forcing it to Return True or False

WordPress's add_filter() function takes the name of a filter and the name of a callback function as args.

The args __return_true and __return_false can be applied to a WordPress filter to make it return true or false instead of, for example, creating a unique function that returns true or false to pass as an arg.

For example, to debug YoastSEO's Schema output, the following filter can be added to return pretty JSON:

add_filter( 'yoast_seo_development_mode', '__return_true' );

Or, to disable Schema output entirely:

add_filter( 'wpseo_json_ld_output', '__return_false' );

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