PHP | mysqli_stmt_free_result() 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_stmt_free_result() Function.

The built-in PHP mysqli_stmt_free_result() function accepts a prepared statement object as a parameter, and then frees the memory in which the result of the given statement is stored (when you store the result using the mysqli_stmt_store_result() function).

Syntax

Following below is the syntax to use this function -

mysqli_stmt_free_result($stmt);

READ: PHP | mysqli_stmt_field_count() Function

Parameter Details

Sr.No	Parameter & Description
1	stmt(Mandatory) This is an object representing the prepared statement.

Return Value

This built-in PHP function does not return any value.

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_stmt_free_result() function (in a procedural style) -

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

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

   //Reading records
   $stmt = mysqli_prepare($con, "SELECT * FROM Test");

   //Executing the statement
   mysqli_stmt_execute($stmt);

   //Storing the result
   mysqli_stmt_store_result($stmt);

   //Number of rows
   $count = mysqli_stmt_num_rows($stmt);
   print("Number of rows in the table: ".$count."\n");

   //Freeing the resultset
   mysqli_stmt_free_result($stmt);

   $count = mysqli_stmt_num_rows($stmt);
   print("Number of rows after freeing the result: ".$count."\n");

   //Closing the statement
   mysqli_stmt_close($stmt);

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

Output

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

Table Created.....
Number of rows in the table:  3
Number of rows after freeing the result:  0

Example2

In an object oriented style the syntax of this function is $stmt->free_result(); 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");

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

   //Storing the result
   $stmt->store_result();
   print("Number of rows ".$stmt ->num_rows);

   //Freeing the resultset memory
   $stmt->free_result();

   //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 rows:  3

READ: PHP | mysqli_stmt_fetch() 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 PHP mysqli_stmt_get_result() Function.

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