php +mysql mysql_fetch_lengths 教程

作者:袖梨 2022-07-02

mysql_fetch_lengths 的作用是判断mysql_fetch_array ( ) , mysql_fetch_assoc ( ) , mysql_fetch_object ( )或mysql_fetch_row ( )的长度,如果成功就返回一个陈列,否则就返回false;

mysql_fetch_lengths的语法.

mysql_fetch_lengths(data)
参数.
data:必选就是mysql_query返回的值
来我们来看看实例.

$sql = "SELECT * from Person WHERE Lastname='Refsnes'";
$result = mysql_query($sql,$con);
print_r(mysql_fetch_row($result));
print_r(mysql_fetch_lengths($result));
?>
输出结果.
Array
(
[0] => Refsnes
[1] => Kai Jim
[2] => Taugata 2
[3] => 22
)
Array
(
[0] => 7
[1] => 7
[2] => 9
[3] => 2
)

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