acf/location/validate_rule │ filter-hook │ ACF 1.0

Usage

add_filter( 'acf/location/validate_rule', 'wp_kama_acf_location_validate_rule_filter' );

/**
 * Function for `acf/location/validate_rule` filter-hook.
 * 
 * @param  $rule 
 *
 * @return 
 */
function wp_kama_acf_location_validate_rule_filter( $rule ){
	// filter...
	return $rule;
}

$rule

-

Where the hook is called

$rule = apply_filters( 'acf/location/validate_rule', $rule );

Where the hook is used in Advanced Custom Fields PRO