php - How to delete settings in Wordpress on plugin uninstall? -


i'm developing first wordpress plugin , register plugin settings on admin_init hook:

register_setting( 'option_group', 'option_name', 'sanitize_callback' );

it works, great. on deactivating (register_deactivation_hook) set:

unregister_setting( 'option_group', 'option_name' );

it works. how delete settings on plugin uninstall? when put 

delete_option( 'option_name' );

in uninstall.php can't delete plugin plugins page (wp shows "deletion failed: sure want this? please try again." notification). why?

fixed. 1 of security checks used interfere delete_option:

check_admin_referer

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