pg_field_is_null
pg_field_num
PostgreSQL Functions
PHP Manual

# pg_field_name

(PHP 4 >= 4.2.0, PHP 5)

pg_field_name — Returns the name of a field

### Descripción

string pg_field_name ( resource `$result` , int `$field_number` )

pg_field_name() returns the name of the field occupying the given `field_number` in the given PostgreSQL `result` resource. Field numbering starts from 0.

> Note: This function used to be called pg_fieldname().

### Lista de parámetros

`result`

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

`field_number`

  Field number, starting from 0.

### Valores retornados

The field name, or `FALSE` on error.

### Ejemplos

Example #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";
}
?>`

El resultado del ejemplo seria:

    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

### Ver también

- pg_field_num() - Returns the field number of the named field

pg_field_is_null
pg_field_num
PostgreSQL Functions
PHP Manual