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

    Опис

    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.

    Зауваження: Ця функція встановлює NULL-полям значення PHP null.

    Параметри

    result

    Примірник PgSql\Result, якого повертає одна з функцій pg_query(), pg_query_params() або pg_execute() (серед інших).

    field

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

    Значення, що повертаються

    An array with all values in the result column.

    Журнал змін

    Версія Опис
    8.1.0 Тепер параметр result має бути примірником PgSql\Result. Раніше очікувався resource.

    Приклади

    Приклад #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);

    ?>

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    User Contributed Notes 3 notes

    up
    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){}
    ?>
    up
    -1
    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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