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<?php function func_get_args_in_current_user_can( $capability ) { $args = array_slice( func_get_args(), 1 ); $args = array_merge( array( $capability ), $args ); var_dump($args); } function func_get_args_simplified( $capability ) { $args = func_get_args(); var_dump($args); } // Passing 1 arg. func_get_args_in_current_user_can( 'edit_posts' ); func_get_args_simplified( 'edit_posts' ); // Passing 2 args. func_get_args_in_current_user_can( 'edit_post', 10 ); func_get_args_simplified( 'edit_post', 10 ); // Passing 3 args. func_get_args_in_current_user_can( 'edit_post_meta', 10, 'meta_key' ); func_get_args_simplified( 'edit_post_meta', 10, 'meta_key' );