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

    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

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    用户贡献的备注 3 notes

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    3
    strata_ranger at hotmail dot com
    15 years ago
    Unfortunate that pg_fetch_all_columns() doesn't support fetching a column by its name -- if you want to do that, you'll need to use pg_field_num() as an intermediary:

    For example:

    <?php

    if ($foo)
    $cols = "email_address";

    else
    $cols = "last_name, middle_init";

    $result = pg_query("Select first_name, $info, birthday from users_table");

    // Problem -- does column #2 refer to the 'birthday' or 'middle_init' field?
    $array = pg_fetch_all_columns($result, 2);

    // Won't work, must use a column number instead of its name
    $array = pg_fetch_all_columns($result, 'birthday');

    // Works
    $array = pg_fetch_all_columns($result, pg_field_num($result, 'birthday'));

    ?>
    up
    2
    spambin at ya dot ru
    10 years ago
    pg_fetch_all_columns() returns array (empty array) even if the result set in empty (while pg_fetch_all() returns FALSE when the result set is empty)

    <?
    $result     = pg_query("
    SELECT 'something'
    WHERE 1 = 2
    "    );
    var_dump( pg_fetch_all($result) ); // boolean false
    var_dump( pg_fetch_all_columns($result) ); // array(0){}
    ?>
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    0
    massiv at nerdshack dot com
    16 years ago
    php 4 equivalent:

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

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

    // Get an array of all author names
    $arr = array();
    while (    $line = pg_fetch_array($result)) {
    array_push($arr, $line['name']);
    }

    var_dump($arr);

    ?>
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