PHP mysqli_field_count() Function

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Definition and Usage

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

Syntax

mysqli_field_count($con)

Parameters

Return Values

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

PHP Version

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

Example

Following example demonstrates the usage of the mysqli_field_count() function (in 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);
?>

This will produce following result −

Field Count: 6

Example

In 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();
?>

This will produce following result −

Field Count: 3

Example

Following is another example of the 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($con, "INSERT INTO employee (FIRST_NAME, AGE) VALUES (Archana, 25), (Bhuvan, 29)");
   print("Field Count: ".mysqli_field_count($con));
  
   //Closing the connection
   mysqli_close($con);
?>

This will produce following result −

Field Count: 0
Field Count: 0

Example

<?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);
?>

This will produce following result −

6