PHP | mysqli_stmt_reset() 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_reset() Function.

The built-in PHP mysqli_stmt_reset() function accepts a prepared statement object (previously opened) as a parameter, and resets it i.e. it resets the errors, unbuffered result sets and data sent. The query, bindings and, stored result sets will not be changed.

Syntax

Following below is the syntax to use this function -

mysqli_stmt_reset($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 returns TRUE on success and FALSE on failure.

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 the built-in PHP mysqli_stmt_reset() function (in 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')");
   print("Record Inserted.....\n");

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

   //Executing the statement
   mysqli_stmt_execute($stmt);

   $res = mysqli_stmt_reset($stmt);
   if($res){
      print("Reset Successful");	
   }

   //Binding values in result to variables
   $res = mysqli_stmt_bind_result($stmt, $id, $fname, $lname, $pob, $country);

   while (mysqli_stmt_fetch($stmt)) {
      print("Id: ".$id."\n");
      print("fname: ".$fname."\n");
      print("lname: ".$lname."\n");
      print("pob: ".$pob."\n");
      print("country: ".$country."\n");
      print("\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 -

Record Inserted.....
Reset Successful

Since we reset the statement in the middle, the contents of the result are not printed. Without the reset function this program produces the following result -

Record Inserted.....
Reset Successful
E:\PHPExamples>php procedure_oriented.php
Table Created.....
Record Inserted.....
Id: 1
fname: Kennedy
lname: Nkpara
pob: PortHarcourt
country: Nigeria

Id: 2
fname: Jonathan
lname: Trott
pob: CapeTown
country: SouthAfrica

Example2

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

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

   //Creating a table
   $con -> query("CREATE TABLE players(ID INT, First_Name VARCHAR(255), Last_Name VARCHAR(255), Place_Of_Birth VARCHAR(255), Country VARCHAR(255))");
   print("Table Created.....\n");

   //Inserting values into the table using prepared statement
   $stmt = $con -> prepare( "INSERT INTO players values(?, ?, ?, ?, ?)");

   $res = $stmt->reset();

   if($res){
      print("Reset Successful");	
   }

   //Binding values to the parameter markers
   $stmt -> bind_param("issss", $id, $fname, $lname, $pob, $country);
   $id = 1;
   $fname = 'Kennedy';
   $lname = 'Nkpara';
   $pob = 'PortHarcourt';
   $country = 'Nigeria';

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

   //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.....
Reset Successful

And the contents of the players table will be empty -

mysql> drop table players;
Query OK, 0 rows affected (0.26 sec)

If you remove the reset() function and then execute the above program, the contents of the players table will be as follows -

mysql> select * from players;
+------+------------+-----------+----------------+---------+
| ID   | First_Name | Last_Name | Place_Of_Birth | Country |
+------+------------+-----------+----------------+---------+
|    1 | Kennedy    | Nkpara    | PortHarcourt   | Nigeria |
+------+------------+-----------+----------------+---------+
1 row in set (0.00 sec)

READ: PHP | mysqli_stmt_prepare() 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_stmt_result_metadata() Function in PHP.

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