PHP | mysqli_info() Function

PHP mysqli_info() 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_info() Function.

The built-in PHP mysqli_info() function is used to get the information about the query executed by the last MYSQLi function call. This function supports queries that are only in the following format below -

  • INSERT INTO...SELECT....
  • INSERT INTO...VALUES (...),(...),(...).
  • LOAD DATA INFILE....
  • ALTER TABLE....
  • UPDATE....

Syntax

Following below is the syntax to use this function -

mysqli_info($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 a string value representing the description/info of the latest query executed. If the latest query executed is not one of the supported ones, then this function returns an empty string.

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_info() function (in a procedural style) -

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

   //Query to insert a record into the employee table
   mysqli_query($con, "INSERT INTO employee VALUES ('Kennedy', 'Nkpara', 27, 'M', 15000,  101), ('Precious', 'Amah', 25, 'F', 2256,  102)");

   //Query Info
   $error = mysqli_info($con);
   print("Query Info: ".$error);

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

Output

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

Query Info: Records: 2  Duplicates: 0  Warnings: 0

Example2

In an object oriented style the syntax of this function is $con->info. Following is the example of this function in an object oriented style -

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

   //Query to retrieve all the rows of employee table
   $con -> query("INSERT INTO employee VALUES ('Kennedy', 'Nkpara', 27, 'M', 15000,  101), ('Precious', 'Amah', 25, 'F', 2256,  102)");

   //Query Info
   $info = $con ->info;
   print("Query Info: ".$info);

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

Output

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

Query Info: Records: 2  Duplicates: 0  Warnings: 0

Example3

Following is another example of the PHP mysqli_info() function -

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

   //ALTER TABLE Query
   mysqli_query($con, "ALTER TABLE table_name DROP COLUMN CONTACT");
   print("Info: ".mysqli_info($con)."\n");

   //UPDATE Query
   mysqli_query($con, "UPDATE employee set INCOME=INCOME+5000");
   print("Info: ".mysqli_info($con)."\n");

   //INSERT Query
   mysqli_query($con, "INSERT INTO employee (FIRST_NAME, AGE) VALUES (Paul, 30), (Justice, 28)");
   print("Info: ".mysqli_info($con)."\n");

   //INSERT Query using SELECT
   mysqli_query($con, "INSERT into employee(FIRST_NAME, LAST_NAME, AGE) select 'Stephen', 'Harcourt', 29");
   print("Info: ".mysqli_info($con)."\n");

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

Output

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

Info:
Info: Rows matched: 3  Changed: 3  Warnings: 0
Info: Rows matched: 3  Changed: 3  Warnings: 0
Info: Records: 1  Duplicates: 0  Warnings: 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();
   }
   
   $sql1 = "CREATE TABLE NewTable SELECT * FROM(employee)";
   mysqli_query($connection_mysql,$sql1);
   
   echo mysqli_info($connection_mysql);  
   
   mysqli_close($connection_mysql);
?>

Output

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

Records: 7  Duplicates: 0  Warnings: 0


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

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