PHP: pg_num_fields - Manual

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Last updated: Sat, 27 Jan 2007

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# pg_num_fields

(PHP 4 >= 4.2.0, PHP 5)

pg_num_fields -- Returns the number of fields in a result

## Описание

int pg_num_fields ( resource result )

pg_num_fields() returns the number of fields (columns) in a PostgreSQL result resource.

> Замечание: This function used to be called pg_numfields().

## Список параметров

`result`

  PostgreSQL query result resource, returned by pg_query(), pg_query_params() or pg_execute() (among others).

## Возвращаемые значения

The number of fields (columns) in the result. On error, -1 is returned.

## Примеры

Пример 1. pg_num_fields() example

`<?php $result = pg_query($conn, "SELECT 1, 2"); $num = pg_num_fields($result); echo $num . " field(s) returned.\n"; ?>`

Результат выполнения данного примера:

    2 field(s) returned.

## Смотрите также

pg_num_rows()
pg_affected_rows()

add a note User Contributed Notes
pg_num_fields
mark at redbrick dot dcu dot ie
24-Mar-2003 01:02
`Here is a simple example for using pg_num_feilds, pg_num_rows and pg_result together. I'm simply SELECTing * from a table named markie on the current pg_connect().
<?php
$pgsql_conn = pg_connect("dbname=mark host=localhost");
if (!$pgsql_conn) {
print pg_last_error($pgsql_conn);
exit;
}
$results = pg_query($pgsql_conn, "SELECT * FROM markie");
echo "<table border=1>\n";
for($lt = 0; $lt < pg_num_rows($results); $lt++) {
echo "<tr>\n";
for($gt = 0; $gt < pg_num_fields($results); $gt++) {
echo "<td>" . pg_result($results, $lt, $gt) . "</td>\n";
}
echo "</tr>\n";
}
echo "</table>\n";
pg_close($pgsql_conn);
?>
This code snippet will print out the rows and columns into a HTML table.
Regards, --mark`
add a note
pg_num_rows pg_meta_data

Last updated: Sat, 27 Jan 2007
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