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# pg_field_name

(PHP 4 >= 4.2.0, PHP 5)

pg_field_name -- 返回字段的名字

## 说明

string pg_field_name ( resource result, int field_number )

pg_field_name() 返回给定 PostgreSQL result 资源中的 field_number 所代表的字段名。字段编号从 0 开始。

例子 1. 获取字段信息
`<?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"; } ?>`
上例的输出如下：
    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

> 注: 本函数以前的名字为 pg_fieldname()。

参见 pg_field_num()。

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