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_error() Function.
During the attempt to connect to MYSQL server, if any error occurs the built-in PHP mysqli_connect_error() function returns the description 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_error() function returns the description of the error occurred (during the last connection call).
Syntax
Following below is the syntax to use this function -
mysqli_connect_error()
Parameter Details
This built-in function does not accept any parameters.
Return Value
This built-in PHP function returns a string value representing the description of the error from the last connection call, Incase of a failure. If the last connection call was successful, this function returns NULL.
PHP Version
This built-in function was first introduced in PHP version 5 and it works in all of the later versions.
Example1
The following example below demonstrates the usage of built-in mysqli_connect_error() function (in a procedural style) -
<?php //Creating a connection $con = @mysqli_connect("localhost", "root", "wrong_password", "mydb"); //Connection Error $error = mysqli_connect_error($con); print("Error: ".$error); ?>
Output
When the above code is executed, it will produce the following result -
Error: Access denied for user 'root'@'localhost' (using password: YES)
Example2
In an object oriented style the syntax of this function is $con->connect_error(). Following is the example of this function in an object oriented style $minus;
<?php //Creating a connection $con = @new mysqli("localhost", "root", "wrong_password", "mydb"); //Connection Error $error = $con->connect_error; print("Error: ".$error); ?>
Output
When the above code is executed, it will produce the following result -
Error: Access denied for user 'root'@'localhost' (using password: YES)
Example3
The following example demonstrates the behaviour of PHP mysqli_connect_error() function Incase of a successful connection -
<?php //Creating a connection $con = @mysqli_connect("localhost", "root", "password", "mydb"); //Connection Error $error = mysqli_connect_error(); if(!$con){ print("Connection Failed: ".$error); }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_error()); } ?>
Output
When the above code is executed, it will produce the following result -
Connection error: Access denied for user 'root'@'localhost' (using password: YES)
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 PHP mysqli_debug() Function.
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