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

Açıklama

pg_num_fields(PgSql\Result $result): int

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

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

Bağımsız Değişkenler

result: pg_query(), pg_query_params() veya pg_execute() işlevinden dönen PgSql\Result nesnesi.

Dönen Değerler

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

Sürüm Bilgisi

Sürüm:	Açıklama
8.1.0	`sonuç` bağımsız değişkeni artık PgSql\Result nesnesi kabul ediyor, evvelce bir özkaynak kabul ederdi.

Örnekler

Örnek 1 pg_num_fields() example

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

$num = pg_num_fields($result);

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

Yukarıdaki örneğin çıktısı:

2 field(s) returned.

Ayrıca Bakınız

pg_num_rows() - Returns the number of rows in a result
pg_affected_rows() - Returns number of affected records (tuples)

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User Contributed Notes 1 note

down

-1

mark at redbrick dot dcu dot ie ¶

21 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

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