获得和 connection 相关的选项

# pg_options

(PHP 4, PHP 5, PHP 7, PHP 8)

pg_options — 获得和 connection 相关的选项

### 说明

function pg_options(?PgSql\Connection `$connection` = `null`): string

pg_options() 将返回字符串，包含指定 PostgreSQL `connection` 实例的特定选项。

### 参数

`connection`

  An PgSql\Connection instance. When `connection` is `null`, the default connection is used. The default connection is the last connection made by pg_connect() or pg_pconnect().

  警告

  As of PHP 8.1.0, using the default connection is deprecated.

### 返回值

包含 `connection` 选项的 string。

### 更新日志

版本 | 说明
--- | ---
8.1.0 | 现在 `connection` 参数接受 PgSql\Connection 实例，之前接受 resource。
8.0.0 | `connection` 现在可为 null。

### 示例

示例 #1 pg_options() 示例

    <?php
       $pgsql_conn = pg_connect("dbname=mark host=localhost");
       echo pg_options($pgsql_conn);
    ?>

### 参见

- pg_connect() - 打开 PostgreSQL 连接

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