In case of UTF8 fields mysql_field_len() will return 3 times the maximum length (e.g. 30 for a VARCHAR(10) field)) for mysql_field_len() returns the byte length of the field not the defined size.
mysql_fetch_lengths
(PHP 4, PHP 5)
mysql_fetch_lengths — Get the length of each output in a result
Warning
This extension is deprecated as of PHP 5.5.0, and will be removed in the future. Instead, the MySQLi or PDO_MySQL extension should be used. See also MySQL: choosing an API guide and related FAQ for more information. Alternatives to this function include:
說明
array mysql_fetch_lengths
( resource
$result
)Returns an array that corresponds to the lengths of each field in the last row fetched by MySQL.
mysql_fetch_lengths() stores the lengths of each result column in the last row returned by mysql_fetch_row(), mysql_fetch_assoc(), mysql_fetch_array(), and mysql_fetch_object() in an array, starting at offset 0.
回傳值
An array of lengths on success 或者在失敗時回傳 FALSE.
範例
Example #1 A mysql_fetch_lengths() example
<?php
$result = mysql_query("SELECT id,email FROM people WHERE id = '42'");
if (!$result) {
echo 'Could not run query: ' . mysql_error();
exit;
}
$row = mysql_fetch_assoc($result);
$lengths = mysql_fetch_lengths($result);
print_r($row);
print_r($lengths);
?>
上例的輸出類似於：
Array
(
[id] => 42
[email] => user@example.com
)
Array
(
[0] => 2
[1] => 16
)
參見
- mysql_field_len() - Returns the length of the specified field
- mysql_fetch_row() - Get a result row as an enumerated array
- strlen() - Get string length
add a note
User Contributed Notes 1 note
Bavo Janss ¶
14 years ago
