Fetches all rows in a particular result column as an array

# pg_fetch_all_columns

(PHP 5 >= 5.1.0, PHP 7, PHP 8)

pg_fetch_all_columns — Fetches all rows in a particular result column as an array

### 说明

function pg_fetch_all_columns(PgSql\Result `$result`, int `$field` = 0): array

pg_fetch_all_columns() returns an array that contains all rows (records) in a particular column of the PgSql\Result instance.

> 注意: 此函数将 NULL 字段设置为 PHP `null` 值。

### 参数

`result`
  PgSql\Result 实例，由 pg_query()、pg_query_params() 或者 pg_execute()（等）返回。
`field`

  Column number. Defaults to the first column if not specified.

### 返回值

An array with all values in the result column.

### 更新日志

版本 | 说明
--- | ---
8.1.0 | 现在 `result` 参数接受 PgSql\Result 实例，之前接受 resource。

### 示例

示例 #1 pg_fetch_all_columns() example

    <?php
    $conn = pg_pconnect("dbname=publisher");
    if (!$conn) {
      echo "An error occurred.\n";
      exit;
    }

    $result = pg_query($conn, "SELECT title, name, address FROM authors");
    if (!$result) {
      echo "An error occurred.\n";
      exit;
    }

    // Get an array of all author names
    $arr = pg_fetch_all_columns($result, 1);

    var_dump($arr);

    ?>

### 参见

- pg_fetch_all() - 从结果中获取所有行作为数组

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