What’s a simple but secure method to get file contents into WordPress?

I had to dig pretty deep for this too, and eventually figured out some way to do this.

in my solution I used the following:

WP_Filesystem();
global $wp_filesystem;
$wp_filesystem->exists( '/path/to/file' ); //use any other functions available in the Filesystem API: @see https://developer.wordpress.org/reference/classes/wp_filesystem_direct/

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