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# mysql_fetch_field

(PHP 3, PHP 4 , PHP 5)

mysql_fetch_field -- Get column information from a result and return as an object

## Description

object mysql_fetch_field ( resource result [, int field_offset])

Returns an object containing field information.

mysql_fetch_field() can be used in order to obtain information about fields in a certain query result. If the field offset isn't specified, the next field that wasn't yet retrieved by mysql_fetch_field() is retrieved.

The properties of the object are:

- name - column name

- table - name of the table the column belongs to

- max_length - maximum length of the column

- not_null - 1 if the column cannot be `NULL`

- primary_key - 1 if the column is a primary key

- unique_key - 1 if the column is a unique key

- multiple_key - 1 if the column is a non-unique key

- numeric - 1 if the column is numeric

- blob - 1 if the column is a BLOB

- type - the type of the column

- unsigned - 1 if the column is unsigned

- zerofill - 1 if the column is zero-filled

> 備注:此函數傳回的欄位是有大小寫之分。

示範 1.mysql_fetch_field() example
`<?php $conn = mysql_connect('localhost:3306', 'user', 'password'); if (!$conn) { die('Could not connect: ' . mysql_error()); } mysql_select_db('database'); $result = mysql_query('select * from table'); if (!$result) { die('Query failed: ' . mysql_error()); } /* get column metadata */ $i = 0; while ($i < mysql_num_fields($result)) { echo "Information for column $i:<br />\n"; $meta = mysql_fetch_field($result, $i); if (!$meta) { echo "No information available<br />\n"; } echo "<pre> blob: $meta->blob max_length: $meta->max_length multiple_key: $meta->multiple_key name: $meta->name not_null: $meta->not_null numeric: $meta->numeric primary_key: $meta->primary_key table: $meta->table type: $meta->type unique_key: $meta->unique_key unsigned: $meta->unsigned zerofill: $meta->zerofill </pre>"; $i++; } mysql_free_result($result); ?>`

See also mysql_field_seek().

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