mysqli_fetch_lengths()
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);
?>
$con=mysqli_connect("localhost","my_user","my_password","my_db");
// Check connection
if (mysqli_connect_errno($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);
?>
定义和用法
mysqli_fetch_lengths() 函数返回结果集中的字段长度。
语法
mysqli_fetch_lengths(result);
参数 | 描述 |
---|---|
result | 必需。规定由 mysqli_query()、mysqli_store_result() 或 mysqli_use_result() 返回的结果集标识符。 |
技术细节
返回值: | 如果整数表示每个字段(列)的长度则返回数组,如果发生错误则返回 FALSE。 |
---|---|
PHP 版本: | 5+ |