# pg_version

(PHP 5, PHP 7)

pg_version — Returns an array with client, protocol and server version (when available)

### 说明

pg_version ([ resource `$connection` ] ) : array

pg_version() returns an array with the client, protocol and server version. Protocol and server versions are only available if PHP was compiled with PostgreSQL 7.4 or later.

For more detailed server information, use pg_parameter_status().

### 参数

`connection`

  PostgreSQL database connection resource. When `connection` is not present, the default connection is used. The default connection is the last connection made by pg_connect() or pg_pconnect().

### 返回值

Returns an array with client, protocol and server keys and values (if available). Returns `FALSE` on error or invalid connection.

### 范例

Example #1 pg_version() example

    <?php
      $dbconn = pg_connect("host=localhost port=5432 dbname=mary")
         or die("Could not connect");

      $v = pg_version($dbconn);

      echo $v['client'];
    ?>

以上例程会输出：

    7.4

### 参见

- pg_parameter_status() - Looks up a current parameter setting of the server