# yaz_errno

(PHP 4 >= 4.0.1, PECL yaz >= 0.9.0)

yaz_errno — Returns error number

### 说明

yaz_errno ( resource `$id` ) : int

Returns an error number for the server (last request) identified by `id`.

yaz_errno() should be called after network activity for each server - (after yaz_wait() returns) to determine the success or failure of the last operation (e.g. search).

### 参数

`id`

  The connection resource returned by yaz_connect().

### 返回值

Returns an error code. The error code is either a Z39.50 diagnostic code (usually a Bib-1 diagnostic) or a client side error code which is generated by PHP/YAZ itself, such as "Connect failed", "Init Rejected", etc.

### 参见

- yaz_error() - Returns error description
- yaz_addinfo() - Returns additional error information