PHP | mysqli_info() Function

PHP mysqli_info() 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_info() Function.

The PHP mysqli_info() function is used to get information about the query that was executed by the last MYSQLi function call. This PHP 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 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 PHP function was first introduced in PHP version 5 and it works in all the later versions.

Example1

The following example below illustrates the usage of the 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 PHP function is $con->info. The following is the example of this PHP function in 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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