php +mysql mysql_fetch_lengths 教程

來源:互聯網
上載者:User

mysql_fetch_lengths 的作用是判斷mysql_fetch_array ( ) , mysql_fetch_assoc ( ) , mysql_fetch_object ( )或mysql_fetch_row ( )的長度,如果成功就返回一個陳列,否則就返回false;

mysql_fetch_lengths的文法.

mysql_fetch_lengths(data)
參數.
data:必選就是mysql_query返回的值
來我們來看看執行個體.
<?
$sql = "SELECT * from Person WHERE Lastname='Refsnes'";
$result = mysql_query($sql,$con);
print_r(mysql_fetch_row($result));
print_r(mysql_fetch_lengths($result));
?>
輸出結果.
Array([0] => Refsnes[1] => Kai Jim[2] => Taugata 2[3] => 22)
Array([0] => 7[1] => 7[2] => 9[3] => 2)

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