# pg_fetch_all_columns

(PHP 5 >= 5.1.0, PHP 7)

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

### 说明

pg_fetch_all_columns ( resource `$result` [, int `$column` = 0 ] ) : array

pg_fetch_all_columns() returns an array that contains all rows (records) in a particular column of the result resource.

> Note: 此函数将 NULL 字段设置为 PHP `NULL` 值。

### 参数

`result`

  PostgreSQL query result resource, returned by pg_query(), pg_query_params() or pg_execute() (among others).

`column`

  Column number, zero-based, to be retrieved from the result resource. Defaults to the first column if not specified.

### 返回值

An array with all values in the result column.

`FALSE` is returned if `column` is larger than the number of columns in the result, or on any other error.

### 范例

Example #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() - 从结果中提取所有行作为一个数组