Latest web development tutorials
 

PHP mysqli_num_fields() Function

< PHP MySQLi Reference

Example

Return the number of fields (columns) in a result set:

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

$sql="SELECT Lastname,Age FROM Persons ORDER BY Lastname";

if ($result=mysqli_query($con,$sql))
  {
  // Return the number of fields in result set
  $fieldcount=mysqli_num_fields($result);
  printf("Result set has %d fields.\n",$fieldcount);
  // Free result set
  mysqli_free_result($result);
  }

mysqli_close($con);
?>

Definition and Usage

The mysqli_num_fields() function returns the number of fields (columns) in a result set.


Syntax

mysqli_num_fields(result);

Parameter Description
result Required. Specifies a result set identifier returned by mysqli_query() , mysqli_store_result() or mysqli_use_result()

Technical Details

Return Value: Returns the number of fields in the result set
PHP Version: 5+

< PHP MySQLi Reference