pg_num_fields

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

pg_num_fields — 返回字段的数目

说明

pg_num_fields ( resource $result ) : int

pg_num_fields() 返回 PostgreSQL result 中的字段（列）数目。参数是由 pg_query() 函数返回的查询结果资源号。如果出错则返回 -1。

Note:

本函数以前的名字为 pg_numfields()。

参见 pg_num_rows() 和 pg_affected_rows()。

User Contributed Notes

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