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'));
?>
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
Descrierea
pg_fetch_all_columns
( resource
$result
, int $column = 0
) : arraypg_fetch_all_columns() returns an array that contains all rows (records) in a particular column of the result resource.
Notă: Această funcție stabilește câmpurile NULL la valoarea PHP
null.
Parametri
-
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.
Valorile întoarse
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.
Exemple
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);
?>
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User Contributed Notes 3 notes
strata_ranger at hotmail dot com ¶
15 years ago
spambin at ya dot ru ¶
11 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){}
?>
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);
?>
