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() Function.
The mysqli_connect() function establishes a connection with MYSQL server and returns the connection as an object.
The mysqli_connect() function establishes a connection with MYSQL server and returns the connection as an object.
Syntax
Following below is the syntax to use this function -
mysqli_connect([$host, $username, $passwd, $dname, $port, $socket] )
Parameter Details
Sr.No | Parameter & Description |
---|---|
1 | host(Optional) This represents a host name or an IP address. If you pass Null or localhost as a value to this parameter, the local host is considered as host. |
2 | username(Optional) This represents a user name in MySQL. |
3 | passwd(Optional) This is represents the password to the given user. |
4 | dname(Optional) This represents the default database in which the queries should be performed. |
5 | port(Optional) This represents the port number at which you want to establish a connection to MySQL Server. |
6 | socket(Optional) This represents the socket that is to be used. |
Return Value
This built-in function returns the connection object, if a connection got established to a MYSQL server successfully. In case of an unsuccessful connection, this built-in PHP function returns the boolean value false.
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 illustrates the usage of PHP mysqli_connect() function (in a procedural style) -
<?php $host = "localhost"; $username = "root"; $passwd = "password"; $dbname = "mydb"; //Creating a connection $con = mysqli_connect($host, $username, $passwd, $dbname); if($con){ print("Connection Established Successfully"); }else{ print("Connection Failed "); } ?>
Output
When the above code is executed, it will produce the following result -
Connection Established Successfully
Example2
In an object oriented style you can use new mysqli() construct in creating a connection as follows $minus;
<?php $host = "localhost"; $username = "root"; $passwd = "password"; $dbname = "mydb"; //Creating a connection $con = new mysqli($host, $username, $passwd, $dbname); if($con->connect_errno){ print("Connection Failed "); }else{ print("Connection Established Successfully"); } //Closing the connection $con -> close(); ?>
Output
When the above code is executed, it will produce the following result -
Connection Established Successfully
Example3
You can also invoke this function without passing any parameters as shown below -
<?php //Creating a connection $con = @mysqli_connect(); if($con){ print("Connection Established Successfully"); }else{ print("Connection Failed "); } ?>
Output
When the above code is executed, it will produce the following result -
Connection Failed
Example4
Try the following example below -
<?php $connection_mysql = @mysqli_connect("localhost", "root", "wrong_password", "mydb"); if (mysqli_connect_errno($connection_mysql)){ echo "Failed to connect to MySQL: " . mysqli_connect_error(); exit(); } echo ("Connection established successfully"); mysqli_close($connection_mysql); ?>
Output
When the above code is executed, it will produce the following result -
Failed to connect to MySQL: Access denied for user 'root'@'localhost' (using password: YES)
Alright guys! This is where we are rounding up for this tutorial post. In our next tutorial, we are going to be studying about the PHP mysqli_connect_errno() Function.
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