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Register a setting and its sanitization callback.
<?php register_setting( $option_group, $option_name, $sanitize_callback ); ?>
<?php register_setting( 'my_options_group', 'my_option_name', 'intval' ); ?>
Since: 2.7.0
register_setting() is located in wp-admin/includes/plugin.php.
Settings API: register_setting, unregister_setting, add_settings_field, add_settings_section