/**
* Proper ob_end_flush() for all levels
*
* This replaces the WordPress `wp_ob_end_flush_all()` function
* with a replacement that doesn't cause PHP notices.
*/
remove_action( 'shutdown', 'wp_ob_end_flush_all', 1 );
add_action( 'shutdown', function() {
while ( @ob_end_flush() );
} );
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