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_connect_errno() Function.
During the attempt to connect to MYSQL server, if any error occurs the built-in PHP mysqli_connect_errno() function returns the code of the error occurred (during the last connection call).
During the attempt to connect to MYSQL server, if any error occurs the built-in PHP mysqli_connect_errno() function returns the code of the error occurred (during the last connection call).
Syntax
Following below is the syntax to use this function -
mysqli_connect_errno()
Parameter Details
This built-in function does not accept any parameters.
Return Value
This PHP function returns an integer value representing the code of the error from the last connection call, Incase of a failure. If the connection was successful, then this function returns 0.
PHP Version
This built-in function was first introduced in PHP version 5 and it works in all of the later versions.
Example1
Following example illustrates the usage of PHP mysqli_connect_errno() function (in a procedural style) -
<?php //Creating a connection $con = mysqli_connect("localhost", "root", "wrong_password", "mydb"); //Client Error $code = mysqli_connect_errno(); print("Error Code: ".$code);
Output
When the above code is executed, it will produce the following result -
Error Code: 1045
Example2
In an object oriented style the syntax of this PHP function is $con->connect_errno(). The following is the example of this function in an object oriented style $minus;
<?php //Creating a connection $con = @new mysqli("localhost", "wrong_user_name", "password", "mydb"); //Error code $code = $con->connect_errno; print("Error Code: ".$code); ?>
Output
When the above code is executed, it will produce the following result -
Error Code: 1045
Example3
The following example demonstrates the behaviour of PHP mysqli_connect_errno() function Incase of a successful connection -
<?php //Creating a connection $con = @mysqli_connect("localhost", "root", "password", "mydb"); //Error Code $code = mysqli_connect_errno(); if($code){ print("Connection Failed: ".$code); }else{ print("Connection Established Successfully"); } ?>
Output
When the above code is executed, it will produce the following result -
Connection established successfully
Example4
Try the following example below -
<?php $connection = @mysqli_connect("localhost","root","wrong_pass","wrong_db"); if (!$connection){ die("Connection error: " . mysqli_connect_errno()); } ?>
Output
When the above code is executed, it will produce the following result -
Connection error: 1045
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_connect_error() Function.
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