PHP 5.6.0 released

pg_fetch_all_columns

(PHP 5 >= 5.1.0)

pg_fetch_all_columnsFetches all rows in a particular result column as an array

Descripción

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

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

Nota: Esta función define campos NULOS al valor NULL de PHP.

Parámetros

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.

Valores devueltos

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.

Ejemplos

Ejemplo #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
$arr pg_fetch_all_columns($result1);

var_dump($arr);

?>

Ver también

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User Contributed Notes 3 notes

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1
strata_ranger at hotmail dot com
5 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
0
spambin at ya dot ru
9 months 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
0
massiv at nerdshack dot com
5 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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