How to connect database through PHP
PHP provides mysqli contruct or mysqli_connect() function to open a database connection. This function takes six parameters and returns a MySQL link identifier on success or FALSE on failure.
Syntax
$mysqli = new mysqli($host, $username, $passwd, $dbName, $port, $socket);
| Sr.No. | Parameter & Description |
|---|---|
| 1 | $host Optional − The host name running the database server. If not specified, then the default value will be localhost:3306. |
| 2 | $username Optional − The username accessing the database. If not specified, then the default will be the name of the user that owns the server process. |
| 3 | $passwd Optional − The password of the user accessing the database. If not specified, then the default will be an empty password. |
| 4 | $dbName Optional − database name on which query is to be performed. |
| 5 | $port Optional − the port number to attempt to connect to the MySQL server.. |
| 6 | $socket Optional − socket or named pipe that should be used. |
You can disconnect from the MySQL database anytime using another PHP function close().
Syntax
$mysqli->close();
Example
Try the following example to connect to a MySQL server −
Copy and paste the following example as mysql_example.php −
Connecting MySQL Server
connect_errno ) { printf("Connect failed: %s
", $mysqli->connect_error); exit(); } printf('Connected successfully.
'); $mysqli->close(); ?>
Output
Access the mysql_example.php deployed on apache web server and verify the output.
Connected successfully.
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