# pg_field_name

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

pg_field_name — 返回字段的名字

### 说明

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

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。

Example #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

> Note:

> 本函数以前的名字为 pg_fieldname()。

参见 pg_field_num()。