pg_num_fields

(PHP 4 >= 4.2.0, PHP 5, PHP 7, PHP 8)

pg_num_fields — Returns the number of fields in a result

Description

pg_num_fields(PgSql\Result $result): int

pg_num_fields() returns the number of fields (columns) in the PgSql\Result instance.

Note:
This function used to be called pg_numfields().

Parameters

result: An PgSql\Result instance, returned by pg_query() , pg_query_params() or pg_execute() (among others).

Return Values

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

Changelog

Version	Description
8.1.0	The `result` parameter expects an PgSql\Result instance now; previously, a resource was expected.

Examples

Example #1 pg_num_fields() example

<?php
$result = pg_query($conn, "SELECT 1, 2");

$num = pg_num_fields($result);

echo $num . " field(s) returned.\n";
?>

The above example will output:

2 field(s) returned.

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User Contributed Notes 1 note

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-1

mark at redbrick dot dcu dot ie ¶

22 years ago

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