<?php
// First we will connect to our server.
// Indicate the server address, username, and password.
// If you have followed our tutorials since the beginning, your username is root.
 
$link = mysql_connect("localhost","root","YOUR-PASSWORD-HERE");
 
// Now we will check to see if our $link variable shows we connected.
if (!$link) // If it did not connect...
  {
  die('Sorry, I encountered this error: ' . mysql_error());
  // The die function ends the script and uses the mysql_error to show us why we could not connect.
  }
 
// If we've made it this far, then our connection was successful.
// So now we will create our database using the SQL "create database" command.
 
// Using the $link connection, send our request to the server to create our movies database.
if (mysql_query("CREATE DATABASE movies",$link))
  {
  // If successful, tell us it worked.
  echo "Database has been created.";
  }
else // But if it doesn't work, tell us why...
  {
  echo "Could not create database: " . mysql_error();
  }
 
// Now that we are finished with the connection, we will close it.
mysql_close($link);
?>

27 Oct 09 PHP & MySQL Database Tutorial: Introduction

Introduction
We use databases to store information and the most popular database used with PHP is MySQL. It’s also free, which is very convenient for us! If you’d like to build a site like Facebook, or store your customer’s order history, or keep an inventory of car parts, then you will need to use a database.

What is MySQL?
MySQL is an open-source relational database system. It is very powerful and chances are that you’ve been to many web sites that were using a MySQL database to show information to you. In fact, MySQL stores all the information on this blog.

Databases consist of tables, which consists of columns and rows of information. Here’s an example of a table:

Table Name: car_parts_inventory

Row #	Part Name	Part ID
1	Radio	F5JG7
2	Muffler	GG446

So there’s a very small table that stores information about car parts and their associated ID number. Some large databases may contain hundreds of thousands of rows.

I mentioned earlier that MySQL is a relational database, which basically means that two or more tables can share the same attribute. Let’s do a small example. In our database, we’ll store movie information and use a relation to organize which actors are in the movie.

First we have the table that stores our actors:

Table Name: actors

actor_id	actor_name
1	Will Smith
2	Kevin Spacey

And here’s the table that stores our movie information:

Table Name: movies

movie_id	movie_name	movie_star_actor
1	Independence Day	1
2	The Pursuit of Happyness	1
3	Superman Returns	2
4	Hancock	1
5	Pay It Forward	2

In our movie table we have a unique movie_id for each movie, then the movie’s name, and then a number that represents the actor_id (from the first table) who stars in the movie.

In our next tutorial, we’ll look at how to create our new database in MySQL.

Tags: introduction, mysql, php, tutorial

<?php
// This function will add two numbers and return the sum.
function add_numbers($number1,$number2) {
    $total = $number1 + $number2; // add two numbers, assign to $total variable
    return $total; // here is our return value!
}
?>

<?php
// This function will add two numbers and return the sum.
function add_numbers($number1,$number2) {
    $total = $number1 + $number2; // add two numbers, assign to $total variable
    return $total; // here is our return value!
}
 
echo add_numbers(1,3); // This will output 4 because 1 + 3 = 4.
?>

<?php
// This function will add two numbers and return the sum.
function add_numbers($number1,$number2) {
    $total = $number1 + $number2; // add two numbers, assign to $total variable
    return $total; // here is our return value!
}
 
add_numbers(5,14);
 
if ($total > 10) {
    echo "Our total is greater than 10."; // Tell user the sum is greater than 10.
} else { 
    echo "Our total is less than 10."; // Tell user the sum is less than 10.
}
?>