Definition and Usage
定义和用法

The mysql_fetch_lengths() function returns the length of the contents of each field in a row.
mysql_fetch_lengths()函数的作用是：返回结果集中每个字段内容的长度。

The row is retrieved by mysql_fetch_array(), mysql_fetch_assoc(), mysql_fetch_object(), or mysql_fetch_row().
这个结果集可以通过mysql_fetch_array(), mysql_fetch_assoc(), mysql_fetch_object(), 或mysql_fetch_row()获得。

This function returns a numeric array on success, or FALSE on failure or when there are no more rows.
如果函数成功执行，将返回一个数值型数组；如果执行失败或没有任何结果返回将返回False。

Syntax
语法

mysql_fetch_lengths(data)

Example
案例

<?php
$con = mysql_connect("localhost", "peter", "abc123");
if (!$con) { die('Could not connect: ' . mysql_error()); }

$db_selected = mysql_select_db("test_db",$con);
$sql = "SELECT * from Person WHERE Lastname='Refsnes'";
$result = mysql_query($sql,$con);
print_r(mysql_fetch_row($result));
print_r(mysql_fetch_lengths($result));

mysql_close($con);
?>

The output of the code above could be:
上述代码将返回下面的结果：

Array
(
[0] => Refsnes
[1] => Kai Jim
[2] => Taugata 2
[3] => 22
)

Array
(
[0] => 7
[1] => 7
[2] => 9
[3] => 2
) 

评论 (0) All