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# mysql_field_len

(PHP 3, PHP 4 , PHP 5)

mysql_field_len -- Returns the length of the specified field

## Description

int mysql_field_len ( resource result, int field_offset)

mysql_field_len() returns the length of the specified field.

示範 1.A mysql_fetch_len() example
`<?php $result = mysql_query("SELECT id,email FROM people WHERE id = '42'"); if (!$result) { echo 'Could not run query: ' . mysql_error(); exit; } // Will get the length of the value in email so for example // user@example.com would give us a length of 16 $length = mysql_fetch_len($result, 'email'); echo $length; ?>`

For downward compatibility mysql_fieldlen() can also be used. This is deprecated, however.

See also mysql_fetch_lengths() and strlen().

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