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The following code can be placed at the bottom of your functions.php document. It will loop through all your posts within that post type and set fl_flag to 1/true. You can delete it after viewing any page once. If the field fl_flag does not exist in the post it will create the field.
$args=array( 'posts_per_page' => -1, 'post_type' => 'events' ); $the_query = new WP_Query( $args ); if ( $the_query->have_posts() ) : while ( $the_query->have_posts() ) : $the_query->the_post(); update_field('fl_flag', '1', get_the_ID()); endwhile; endif;
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