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Introduction to PHP

In the next lesson, you’ll start creating your own PHP code. Take a second and review what you already know about PHP:

  • Despite its age, PHP is still a commonly used technology in web development.
  • PHP is designed to interact with HTML to generate dynamic websites.
  • Embedding PHP in HTML is done by placing PHP code between <?php and ?> tags.
  • Every statement in PHP must be terminated with a semicolon ;.
  • PHP files have a .php extension and the file always starts with the opening PHP tag <?php. The closing tag is implied and left out by convention.
  • Whitespace is generally ignored when executing PHP code.
  • Keywords are not case sensitive in PHP. As a convention, use the standard casing.
  • Single line comments are made in PHP using # or //. Multi-line comments are placed between /* and */.
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