pg_num_fields

(PHP 4 >= 4.2.0, PHP 5)

pg_num_fields — Returns the number of fields in a result

설명

int pg_num_fields ( resource $result )

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

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

매개변수

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

반환값

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

예제

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";
?>

위 예제의 출력:

2 field(s) returned.

참고

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

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pg_num_rows

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Last updated: Sun, 25 Nov 2007