1. Tutorial 6 PHP & MySQL Li Xu
Department of Systems Engineering and Engineering Management

2. Outline PHP: Hypertext Preprocessor PHP Introduction PHP Syntax
PHP Variables
PHP Functions
MySQL Database
MySQL Introduction
MySQL Connect
MySQL Create DB
MySQL Operations

3. PHP Introduction What is PHP? What is a PHP File?
an acronym for “PHP: Hypertext Preprocessor”
a widely-used, open source scripting language
PHP scripts are executed on the server
free to download and use
What is a PHP File?
PHP files can contain text, HTML, CSS, JavaScript, and PHP code
PHP code are executed on the server, and the result is returned to the browser as plain HTML
PHP files have extension ".php"

4. PHP Introduction What can PHP do? Why PHP?
generate dynamic page content
create, open, read, write, delete, and close files on the server
collect form data
send and receive cookies
add, delete, modify data in your database
be used to control user-access
encrypt data
Why PHP?
run on various platforms (Windows, Linux, Unix, etc.)
compatible with almost all servers used today (Apache, IIS, etc.)
supports a wide range of databases

5. PHP Syntax Basic PHP Syntax Comments in PHP
A PHP script can be placed anywhere in the docment, and starts with ‘<?php’ and ends with ‘?>’
The default file extension for PHP files is “.php”
Comments in PHP

6. PHP Syntax PHP Case Sensitivity
In PHP, all keywords (e.g. if, else, while, echo, etc.), classes, functions, and user-defined functions are NOT case-sensitive.
However, all variable names are case-sensitive

7. PHP Variables Creating (Declaring) PHP Variables
In PHP, a variable starts with the $ sign, followed by the name of the variable:
PHP has no command for declaring a variable, it is created the moment you first assign a value to it.
A variable name must start with a letter or the underscore character, cannot start with a number.
A variable name can only contain alpha-numeric characters and underscores (A-z, 0-9, and _ )
Variable names are case-sensitive ($age and $AGE are two different variables)

8. PHP Variables Output Variables PHP is a loosely typed language
The PHP echo statement is often used to output data to the screen:
PHP is a loosely typed language
PHP automatically converts the variable to the correct data type, depending on its value

9. PHP Functions Create a user defined function in PHP
A user-defined function declaration starts with the word function:
PHP function arguments
Arguments are specified after the function name, inside the parentheses. You can add as many arguments as you want, just separate them with a comma.

10. PHP Functions
PHP default argument value
Returning values

11. MySQL Introduction What is MySQL? Download MySQL Database
a database system used on the web, runs on a server
ideal for both small and large applications
fast, reliable, and easy to use
use standard SQL
complies on a number of platforms
free to download and use
Download MySQL Database
If you don’t have a PHP server with a MySQL Database, you can download it for free via

12. MySQL Connect PHP connect to MySQL Open a connection to MySQL
MySQLi Object-Oriented
PHP connect to MySQL
PHP 5 and later can work with a MySQL database using:
MySQLi extension (the “i” stands for imporved):
PDO (PHP Data Objects)
Open a connection to MySQL
Before we can access data in the MySQL database, we need to be able to connect to the server
PDO

13. MySQL Connect PHP connect to MySQL Close the connection
MySQLi Object-Oriented: $conn->close();
PDO: $conn = null;

14. MySQL Create DB
A database consists of one or more tables, you can use special CREATE privileges to create a MySQL database:
Create a MySQL Database using MySQLi
Create a MySQL Database using PDO

15. MySQL Operations (SQL)
Create a table:
Insert data:
Select data:
select data from one or more tables:
SELECT column_name(s) FROM table_name
select all columns from a table:
SELECT * FROM table_name

16. MySQL Operations (SQL)
Delete data from MySQL:
e.g.: delete from MyGuests where id=3
Update data:
e.g.: update MyGuests set lastname=‘Doe’ where id=2

17. Resources PHP: https://www.w3schools.com/php/default.asp MySQL:

18. Questions and Answers