In PHP, to create database in MySQL functions mysql_create_db() or mysql_query() is used. To create database using mysql mysql_create_db() syntax is as follows:

mysql_create_db($dbname); 

For example: Suppose we want to create a database demo.

Create Database

<?php 
    $link = mysql_pconnect("localhost", "mysql_username", "mysql_password") 
        or die("Could not connect: " . mysql_error()); 

    if (mysql_create_db("demo")) { 
        print ("Database created successfully\n"); 
    } else { 
        printf ("Error creating database: %s\n", mysql_error()); 
    } 
?>

In above program first you connect to the server then you will create database using mysql_create_db(). If database created successfully it returns true else returns false.

To create database using mysql_query() function syntax is as follows:

mysql_query("CREATE DATABASE demo");

For example:

<?php

// hostname or ip of server
$servername='localhost';

// username and password to log onto db server
$dbusername='username';
$dbpassword='password';

$link=mysql_connect ("$servername","$dbusername","$dbpassword")
or die ( " Not able to connect to server ");

$query="CREATE DATABASE demo";
if (mysql_query("$query")) {
print ("Database created successfully <br>");
} else {
print ("Error in creating database:". mysql_error ());
}
?>