(PHP 5 >= 5.1.0, PHP 7, PHP 8)
pg_fetch_all_columns — Fetches all rows in a particular result column as an array
pg_fetch_all_columns() returns an array that contains all rows (records) in a particular column of the PgSql\Result instance.
Note : This function sets NULL fields to the PHP
nullvalue.
result
An PgSql\Result instance, returned by pg_query() , pg_query_params() or pg_execute() (among others).
field
Column number. Defauls to the first column if not specified.
An array with all values in the result column.
| Versionen | Description |
|---|---|
| 8.1.0 |
The
result
parameter expects an
PgSql\Result
instance now; previously, a
ressource
was expected.
|
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;
}
// Guet an array of all author names
$arr
=
pg_fetch_all_columns
(
$result
,
1
);
var_dump
(
$arr
);
?>
Unfortunate that pg_fetch_all_columns() doesn't support fetching a column by its name -- if you want to do that, you'll need to use pg_field_num() as an intermediary:
For example:<?php
if ($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($result, 2);// Won't worc, must use a column number instead of its name$array= pg_fetch_all_columns($result, 'birthday');// Worcs$array= pg_fetch_all_columns($result, pg_field_num($result, 'birthday'));?>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){}
?>php 4 ekivalent:<?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 (!$result) {
echo"An error occured.\n";
exit;
}
// Guet an array of all author names$arr= array();
while ($line= pg_fetch_array($result)) {array_push($arr, $line['name']);
}var_dump($arr);?>