PHP | mysqli_field_count() Function

PHP mysqli_field_count() Function


Hello folks! welcome back to another edition of our tutorial on PHP. In this tutorial guide, we are going to be discussing about the PHP mysqli_field_count() Function.

The built-in PHP mysqli_field_count() function is used to get the number of fields (columns) in the result set of the recently executed MYSQL query.

Syntax

Following below is the syntax to use this function -

mysqli_field_count($con)


Parameter Details

Sr.NoParameter & Description
1

con(Mandatory)

This is an object representing a connection to MySQL Server.


Return Value

This built-in PHP function returns an integer value indicating the number of columns in the result set of the last executed query. If the last query is not a SELECT query (no result set), this function returns 0.

PHP Version

This built-in 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 PHP mysqli_field_count() function (in a procedural style) -

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

   //Query to retrieve all the records of the employee table
   mysqli_query($con, "Select * from employee");

   //Field Count
   $count = mysqli_field_count($con);
   print("Field Count: ".$count);

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

Output

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

Field Count: 6

Example2

In an object oriented style the syntax of this function is $con->field_count;, where $con is the connection object -

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

   //Query to retrieve all the records of the employee table
   $con -> query("Select FIRST_NAME, LAST_NAME, AGE from employee");

   //Field Count
   $count = $con->field_count;
   print("Field Count: ".$count);

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

Output

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

Field Count: 3

Example3

Following is another example of the built-in PHP mysqli_field_count() function -

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

   print("Field Count: ".mysqli_field_count($con)."\n");

   //INSERT Query
   mysqli_query($con, "INSERT INTO employee (FIRST_NAME, AGE) VALUES (Kennedy, 27), (Bethel, 27)");
   print("Field Count: ".mysqli_field_count($con));
  
   //Closing the connection
   mysqli_close($con);
?>

Output

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

Field Count: 0
Field Count: 0

Example4

Try the following example below -

<?php
   $connection_mysql = mysqli_connect("localhost","root", "password", "mydb");
   
   if (mysqli_connect_errno($connection_mysql)){
      echo "Failed to connect to MySQL: " . mysqli_connect_error();
   }
   
   mysqli_query($connection_mysql,"SELECT * FROM employee");
   print(mysqli_field_count($connection_mysql));
   
   mysqli_close($connection_mysql);
?>

Output

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

6


Alright guys! This is where we are rounding up for this tutorial post. In our next tutorial, we will discuss about the PHP mysqli_get_charset() Function.

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