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# mysqli_num_fields

(PHP 5)

mysqli_num_fields

(no version information, might be only in CVS)

result->field_count -- Get the number of fields in a result

## Description

Procedural style:

int mysqli_num_fields ( object result)

Object oriented style (property):

class result {
int field_count
}

mysqli_num_fields() returns the number of fields from specified result set.

## Return values

The number of fields from a result set

## 參考

mysqli_fetch_field()

## Example

示範 1.Object oriented style
`<?php $mysqli = new mysqli("localhost", "my_user", "my_password", "world"); /* check connection */ if (mysqli_connect_errno()) { printf("Connect failed: %s\n", mysqli_connect_error()); exit(); } if ($result = $mysqli->query("SELECT * FROM City ORDER BY ID LIMIT 1")) { /* determine number of fields in result set */ $field_cnt = $result->field_count; printf("Result set has %d fields.\n", $field_cnt); /* close result set */ $result->close(); } /* close connection */ $mysqli->close(); ?>`

示範 2.Procedural style
`<?php $link = mysqli_connect("localhost", "my_user", "my_password", "world"); /* check connection */ if (mysqli_connect_errno()) { printf("Connect failed: %s\n", mysqli_connect_error()); exit(); } if ($result = mysqli_query($link, "SELECT * FROM City ORDER BY ID LIMIT 1")) { /* determine number of fields in result set */ $field_cnt = mysqli_num_fields($result); printf("Result set has %d fields.\n", $field_cnt); /* close result set */ mysqli_free_result($result); } /* close connection */ mysqli_close($link); ?>`

The above examples would produce the following output:

    Result set has 5 fields.

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