PHP | mysqli_stmt_num_rows() 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_num_rows() Function.

The built-in PHP mysqli_stmt_num_rows() function accepts a statement object as a parameter and returns the number of rows in the result set of the given statement.

Syntax

Following below is the syntax to use this function -

mysqli_stmt_num_rows($stmt)

READ: PHP | mysqli_stmt_get_result() Function

Parameter Details

Sr.No	Parameter & Description
1	stmt(Mandatory) This is an object representing a statement executing an SQL query.

Return Value

This built-in PHP function returns an integer value indicating the number of rows in the result set returned by the statement.

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_stmt_num_rows() function (in a procedural style) -

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

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

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

   //Executing the statement
   mysqli_stmt_execute($stmt);

   mysqli_stmt_store_result($stmt);

   //Number of rows
   $count = mysqli_stmt_num_rows($stmt);

   print("Number of rows in the table: ".$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.....
Records Inserted.....
Number of rows in the table:  3

Example2

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

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

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

   $stmt = $con -> prepare( "SELECT * FROM Test");

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

   $stmt->store_result();

   //Number of rows
   $count = $stmt ->num_rows;
   print("Rows affected ".$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.....
Record Inserted.....
Number of rows in the table:  3

Example3

Assuming we have created a table named footballers with the following data $minus;

mysql> select * from footballers;
+----+------------+------------+---------------+----------------+
| ID | First_Name | Last_Name  | Date_Of_Birth | Place_Of_Birth |
+----+------------+------------+---------------+----------------+
|  1 | Alex       | Iwobi      | 1996-05-03    | Nigeria        |
|  2 | Samuel     | Chukwueze  | 1999-05-22    | Nigeria        | 
|  3 | Chinedu    | Obasi      | 1986-06-01    | Nigeria        |
|  4 | Sone       | Aluko      | 1989-09-19    | Nigeria        |
|  5 | Francis    | Uzoho      | 1998-10-28    | Nigeria        |
|  6 | Brown      | Ideye      | 1998-10-10    | Nigeria        |
+----+------------+------------+---------------+----------------+
6 rows in set (0.07 sec)

If you try to invoke this built-in PHP function directly, since the results haven't stored yet, it returns 0 -

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

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

   //Executing the statement
   mysqli_stmt_execute($stmt);

   print("Number of rows in the table: ".mysqli_stmt_num_rows($stmt));

   //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 below -

Number of rows in the table:  0

READ: PHP | mysqli_stmt_errno() Function

Alright guys! This is where we are going to be rounding up with this tutorial post. In our next tutorial, we will study about the PHP mysqli_stmt_param_count() Function.

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