How to use php mysqli_fetch_lengths function

php mysqli_fetch_lengths() function returns the field length in the result set. The syntax is mysqli_fetch_lengths(result); if successful, the function returns an array of numbers. If there is an error or there are no other rows, it returns false.

php How to use the mysqli_fetch_lengths() function?

The mysqli_fetch_lengths() function returns the field length in the result set.

Syntax:

mysqli_fetch_lengths(result);

Parameters

result: Required. Specifies the result set identifier returned by mysqli_query(), mysqli_store_result(), or mysqli_use_result().

Return value: If successful, the function returns an array of numbers. If there is an error or there are no other rows, it returns false.

php mysqli_fetch_lengths() function example

Returns the field length in the result set:

<?php 
// 假定数据库用户名：root，密码：123456，数据库：data 
$con=mysqli_connect("localhost","root","123456","data"); 
if (mysqli_connect_errno($con)) 
{ 
    echo "连接 MySQL 失败: " . mysqli_connect_error(); 
} 
$sql="SELECT name,url FROM websites ORDER BY alexa";
if ($result=mysqli_query($con,$sql))
{
    $row=mysqli_fetch_row($result);
    
    // 显示字段长度
    foreach (mysqli_fetch_lengths($result) as $i=>$val)
    {
        printf("字段 %2d 长度为: %2d",$i+1,$val);
        echo "<br>";
    }
    
    // 释放结果集
    mysqli_free_result($result);
}
mysqli_close($con);
?>

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