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PHP Quiz PHP CertificatePHP Connect to the MySQL Server
Use the PHP mysqli_connect() function to open a new connection to the MySQL server.
Open a Connection to the MySQL Server
Before we can access data in a database, we must open a connection to the MySQL server.
In PHP, this is done with the mysqli_connect() function.
Syntax
mysqli_connect(host,username,password,dbname);
| Parameter | Description |
|---|---|
| host | Optional. Either a host name or an IP address |
| username | Optional. The MySQL user name |
| password | Optional. The password to log in with |
| dbname | Optional. The default database to be used when performing queries |
Note: There are more available parameters, but the ones listed above are the most important.
In the following example we store the connection in a variable ($con) for later use in the script:
<?php
// Create connection
$con=mysqli_connect("example.com","peter","abc123","my_db");
// Check connection
if (mysqli_connect_errno($con))
{
echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
?>
// Create connection
$con=mysqli_connect("example.com","peter","abc123","my_db");
// Check connection
if (mysqli_connect_errno($con))
{
echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
?>
Close a Connection
The connection will be closed automatically when the script ends. To close the connection before, use the mysqli_close() function:
<?php
$con=mysqli_connect("example.com","peter","abc123","my_db");
// Check connection
if (mysqli_connect_errno($con))
{
echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
mysqli_close($con);
?>
$con=mysqli_connect("example.com","peter","abc123","my_db");
// Check connection
if (mysqli_connect_errno($con))
{
echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
mysqli_close($con);
?>
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