PHP | mysqli_num_fields() Function

Hello folks! welcome back to a new edition of our tutorial on PHP. In this tutorial guide, we are going to be studying about the PHP mysqli_num_fields() Function.

The mysqli_num_fields() function accepts a result object as a parameter, retrieves and returns the number of fields in the given object.

Syntax

Following below is the syntax to use this function -

mysqli_num_fields($result);

READ: PHP | mysqli_field_seek() Function

Parameter Details

Sr.No	Parameter & Description
1	result(Mandatory) This is an identifier representing a result object.

Return Value

This built-in function returns an integer value specifying the number of fields in the given result object.

PHP Version

This PHP function was first introduced in PHP version 5 and works in all the later versions.

Example1

The following below is an example which demonstrates the usage of the built-in PHP mysqli_num_fields() function (in a procedural style) -

<?php
   $con = mysqli_connect("localhost", "root", "password", "mydb");

   mysqli_query($con, "CREATE TABLE myplayers(ID INT, First_Name VARCHAR(255), Last_Name VARCHAR(255), Place_Of_Birth VARCHAR(255), Country VARCHAR(255))");
   print("Table Created.....\n");
   mysqli_query($con, "INSERT INTO myplayers values(1, 'Kennedy', 'Nkpara', 'PortHarcourt', 'Nigeria')");
   mysqli_query($con, "INSERT INTO myplayers values(2, 'Jonathan', 'Trott', 'CapeTown', 'SouthAfrica')");
   mysqli_query($con, "INSERT INTO myplayers values(3, 'Queen', 'Douglas', 'Texas', 'UnitedStates')");
   print("Record Inserted.....\n");

   //Retrieving the contents of the table
   $result = mysqli_query($con, "SELECT * FROM myplayers");

   //Number of fields
   $count = mysqli_num_fields($result);
   print("Number of fields in the result: ".$count);

   //Closing the statement
   mysqli_free_result($result);

   //Closing the connection
   mysqli_close($con);
?>

Output

When the above code is executed, it will produce the following result -

Table Created.....
Record Inserted.....
Number of fields in the result: 5

Example2

In an object oriented style the syntax of this function is $result->field_count(); Following is the example of this function in an object oriented style -

<?php
   //Creating a connection
   $con = new mysqli("localhost", "root", "password", "mydb");

   $con -> query("CREATE TABLE Test(Name VARCHAR(255), AGE INT)");
   $con -> query("insert into Test values('Kennedy', 27),('Paul', 30),('Justice', 28)");
   print("Table Created.....\n");

   $stmt = $con -> prepare( "SELECT * FROM Test WHERE Name in(?, ?)");
   $stmt -> bind_param("ss", $name1, $name2);
   $name1 = 'Kennedy';
   $name2 = 'Paul';

   //Executing the statement
   $stmt->execute();

   //Retrieving the result
   $result = $stmt->get_result();

   //Number of fields
   $count = $result->field_count;
   print("Number of fields in the result: ".$count);

   //Closing the statement
   $stmt->close();

   //Closing the connection
   $con->close();
?>

Output

When the above code is executed, it will produce the following result -

Table Created.....
Number of fields in the result: 2

READ: PHP | mysqli_free_result() Function

Alright guys! This is where we are going to be rounding up for this tutorial post. In our next tutorial, we are going to be discussing about the mysqli_num_rows() Function in PHP.

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