Руководство по PHP
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# pg_field_prtlen

(PHP 4 >= 4.2.0, PHP 5)

pg_field_prtlen -- Returns the printed length

## Описание

int pg_field_prtlen ( resource result, int row_number, mixed field_name_or_number )
int pg_field_prtlen ( resource result, mixed field_name_or_number )

pg_field_prtlen() returns the actual printed length (number of characters) of a specific value in a PostgreSQL `result`. Row numbering starts at 0. This function will return -1 on an error.

`field_name_or_number` can be passed either as an integer or as a string. If it is passed as an integer, PHP recognises it as the field number, otherwise as field name.

See the example given at the pg_field_name() page.

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

## Список параметров

`result`

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

`row`

  Row number in result. Rows are numbered from 0 upwards. If omitted, current row is fetched.

## Возвращаемые значения

The field printed length, or `FALSE` on error.

## Примеры

Пример 1. Getting information about fields

`<?php
$dbconn = pg_connect("dbname=publisher") or die("Could not connect");
$res = pg_query($dbconn, "select * from authors where author = 'Orwell'");
$i = pg_num_fields($res);
for ($j = 0; $j < $i; $j++) {
echo "column $j\n";
$fieldname = pg_field_name($res, $j);
echo "fieldname: $fieldname\n";
echo "printed length: " . pg_field_prtlen($res, $fieldname) . " characters\n";
echo "storage length: " . pg_field_size($res, $j) . " bytes\n";
echo "field type: " . pg_field_type($res, $j) . " \n\n";
}
?>`

Результат выполнения данного примера:

    column 0
    fieldname: author
    printed length: 6 characters
    storage length: -1 bytes
    field type: varchar

    column 1
    fieldname: year
    printed length: 4 characters
    storage length: 2 bytes
    field type: int2

    column 2
    fieldname: title
    printed length: 24 characters
    storage length: -1 bytes
    field type: varchar

## Смотрите также

pg_field_size()

Пред. | Начало | След.
pg_field_num | Уровень выше | pg_field_size