PHP Basics

• PHP code can be embeded directly within an HTML file.
• A PHP file will usually have the extension .php.
• Comment:
  • Multi-line block comments /* */
  • Single-line comments // or #

PHP Tag Example

 

Include PHP files

 

 

PHP $Variables and Data Types

• Variables in PHP are dynamically typed.
• The PHP engine makes a best guess as to the intended type based on what it is being assigned.
• A variable can be assigned different data types over time.
• Variable names are case sensitive.

• Boolean: A logical true or false value
• Integer: whole numbers
• Float: Decimal numbers
• String: Letters
• Array: A collection of data of any type
• Object: Instance of classes

 

Writing to Output: echo

We can use echo() to output something.