PHP mysqli_errno() Function

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Definition and Usage

The mysqli_errno() function returns the code of the error occurred during the last MySQLi function call.

Syntax

mysqli_errno($con)

Parameters

Return Values

PHP mysqli_errno() function returns an integer value representing the code of the error from the last MySQLi function call. If there are no errors this function returns 0.

PHP Version

This function was first introduced in PHP Version 5 and works works in all the later versions.

Example

Following example demonstrates the usage of the mysqli_errno() function (in procedural style) −

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

   //Query to retrieve all the rows of employee table
   mysqli_query($con, "SELECT * FORM employee");

   //Error Code
   $error = mysqli_errno($con);
   print("Error Occurred: ".$error);

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

This will produce following result −

Error Occurred: 1064

Example

In object oriented style the syntax of this function is $con ->errno. Following is the example of this 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("SELECT * FROM wrong_table_name");

   //Error Code
   $error = $con ->errno;
   print("Error Occurred: ".$error);

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

This will produce following result −

Error Occurred: 1146

Example

Following is another example of the mysqli_errno() function −

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

   //Query to SELECT all the rows of the employee table
   mysqli_query($con, "SELECT * FROM employee");
   print("Errors in the SELECT query: ".mysqli_errno($con)."\n");

   //Query to UPDATE the rows of the employee table
   mysqli_query($con, "UPDATE employee set INCOME=INCOME+5000 where FIRST_NAME in (*)");
   print("Errors in the UPDATE query: ".mysqli_errno($con)."\n");

   //Query to INSERT a row into the employee table
   mysqli_query($con, "INSERT INTO employee VALUES (Archana, 'Mohonthy', 30, 'M', 13000, 106)");
   print("Errors in the INSERT query: ".mysqli_errno($con)."\n");

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

This will produce following result −

Errors in the SELECT query: 0
Errors in the UPDATE query: 1064
Errors in the INSERT query: 1054

Example

<?php
   $connection_mysql = mysqli_connect("localhost","root","password","mydb");
   
   if (mysqli_connect_errno($connection_mysql)){
      echo "Failed to connect to MySQL: " . mysqli_connect_error();
   }
   
   if (!mysqli_query($connection_mysql,"INSERT INTO employee (FirstName) VALUES ('Jack')")){
      echo("Error description: " . mysqli_errno($connection_mysql));
   }
   
   mysqli_close($connection_mysql);
?>

This will produce following result −

Error description: 1054