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: An PgSql\Result instance, returned by pg_query(), pg_query_params() or pg_execute()(among others).
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，之前接受资源(resource)。

范例

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() - 从结果中提取所有行作为一个数组

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User Contributed Notes 3 notes

down

strata_ranger at hotmail dot com ¶

13 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'));

?>

down

spambin at ya dot ru ¶

8 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){}
?>

down

-1

massiv at nerdshack dot com ¶

13 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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官方地址：https://www.php.net/manual/en/function.pg-fetch-all-columns.php

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PHP官方手册 - 互联网笔记

pg_fetch_all_columns

说明

参数

返回值

更新日志

范例

参见

User Contributed Notes 3 notes