Heim > Artikel > Backend-Entwicklung > php +mysql mysql_fetch_lengths 教程_PHP教程
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.
<pre class="brush:php;toolbar:false">Array ( [0] => Refsnes [1] => Kai Jim [2] => Taugata 2 [3] => 22 )
Array ( [0] => 7 [1] => 7 [2] => 9 [3] => 2 )