PHP5中文手册

实例

返回结果集中的字段长度：

 <?PHP
 $con=mysqli_connect("localhost","my_user","my_password","my_db");
 // Check connection
 if (mysqli_connect_errno($con))
 {
 echo "Failed to connect to MySQL: " . mysqli_connect_error();
 }

$sql="SELECT * FROM Persons ORDER BY Lastname";

if ($result=mysqli_query($con,$sql))
 {
 $row=mysqli_fetch_row($result);

 // Display field lengths
 foreach (mysqli_fetch_lengths($result) as $i=>$val)
 {
 printf("Field %2d has length: %2dn",$i+1,$val);
 }

 // Free result set
 mysqli_free_result($result);
}

mysqli_close($con);
 ?>